# Auto-generated from cpython_chunk_18.txt

TEXT_DATA = r"""
.. bpo: 26556
.. date: 9636
.. nonce: v5j2uL
.. release date: 2016-06-12
.. original section: Library
.. section: Security
Update expat to 2.1.1, fixes :cve:`2015-1283`.
..
.. bpo: 0
.. date: 9635
.. nonce: E4ochz
.. original section: Library
.. section: Security
Fix TLS stripping vulnerability in smtplib, :cve:`2016-0772`. Reported by Team
Oststrom.
..
.. bpo: 26839
.. date: 9629
.. nonce: yVvy7R
.. original section: Library
.. section: Security
On Linux, :func:`os.urandom` now calls ``getrandom()`` with
``GRND_NONBLOCK`` to fall back on reading ``/dev/urandom`` if the urandom
entropy pool is not initialized yet. Patch written by Colm Buckley.
..
.. bpo: 26657
.. date: 9597
.. nonce: C_-XFg
.. original section: Library
.. section: Security
Fix directory traversal vulnerability with http.server on Windows.  This
fixes a regression that was introduced in 3.3.4rc1 and 3.4.0rc1.  Based on
patch by Philipp Hagemeister.
..
.. bpo: 26313
.. date: 9581
.. nonce: LjZAjy
.. original section: Library
.. section: Security
ssl.py _load_windows_store_certs fails if windows cert store is empty. Patch
by Baji.
..
.. bpo: 25939
.. date: 9561
.. nonce: X49Fqd
.. original section: Library
.. section: Security
On Windows open the cert store readonly in ssl.enum_certificates.
..
.. bpo: 27066
.. date: 9673
.. nonce: SNExZi
.. section: Core and Builtins
Fixed SystemError if a custom opener (for open()) returns a negative number
without setting an exception.
..
.. bpo: 20041
.. date: 9672
.. nonce: TypyGp
.. section: Core and Builtins
Fixed TypeError when frame.f_trace is set to None. Patch by Xavier de Gaye.
..
.. bpo: 26168
.. date: 9671
.. nonce: -nPBL6
.. section: Core and Builtins
Fixed possible refleaks in failing Py_BuildValue() with the "N" format unit.
..
.. bpo: 26991
.. date: 9670
.. nonce: yWGNhz
.. section: Core and Builtins
Fix possible refleak when creating a function with annotations.
..
.. bpo: 27039
.. date: 9669
.. nonce: Zj7tV7
.. section: Core and Builtins
Fixed bytearray.remove() for values greater than 127.  Patch by Joe Jevnik.
..
.. bpo: 23640
.. date: 9668
.. nonce: kvNC4c
.. section: Core and Builtins
int.from_bytes() no longer bypasses constructors for subclasses.
..
.. bpo: 26811
.. date: 9667
.. nonce: oNzUWt
.. section: Core and Builtins
gc.get_objects() no longer contains a broken tuple with NULL pointer.
..
.. bpo: 20120
.. date: 9666
.. nonce: c-FZZc
.. section: Core and Builtins
Use RawConfigParser for .pypirc parsing, removing support for interpolation
unintentionally added with move to Python 3. Behavior no longer does any
interpolation in .pypirc files, matching behavior in Python 2.7 and
Setuptools 19.0.
..
.. bpo: 26659
.. date: 9665
.. nonce: 5PRa83
.. section: Core and Builtins
Make the builtin slice type support cycle collection.
..
.. bpo: 26718
.. date: 9664
.. nonce: K5PQ8j
.. section: Core and Builtins
super.__init__ no longer leaks memory if called multiple times. NOTE: A
direct call of super.__init__ is not endorsed!
..
.. bpo: 25339
.. date: 9663
.. nonce: ZcaC2E
.. section: Core and Builtins
PYTHONIOENCODING now has priority over locale in setting the error handler
for stdin and stdout.
..
.. bpo: 26494
.. date: 9662
.. nonce: G6eXIi
.. section: Core and Builtins
Fixed crash on iterating exhausting iterators. Affected classes are generic
sequence iterators, iterators of str, bytes, bytearray, list, tuple, set,
frozenset, dict, OrderedDict, corresponding views and os.scandir() iterator.
..
.. bpo: 26581
.. date: 9661
.. nonce: yNA7nm
.. section: Core and Builtins
If coding cookie is specified multiple times on a line in Python source code
file, only the first one is taken to account.
..
.. bpo: 26464
.. date: 9660
.. nonce: 7BreGz
.. section: Core and Builtins
Fix str.translate() when string is ASCII and first replacements removes
character, but next replacement uses a non-ASCII character or a string
longer than 1 character. Regression introduced in Python 3.5.0.
..
.. bpo: 22836
.. date: 9659
.. nonce: cimt1y
.. section: Core and Builtins
Ensure exception reports from PyErr_Display() and PyErr_WriteUnraisable()
are sensible even when formatting them produces secondary errors.  This
affects the reports produced by sys.__excepthook__() and when __del__()
raises an exception.
..
.. bpo: 26302
.. date: 9658
.. nonce: UD9XQt
.. section: Core and Builtins
Correct behavior to reject comma as a legal character for cookie names.
..
.. bpo: 4806
.. date: 9657
.. nonce: i9m3hj
.. section: Core and Builtins
Avoid masking the original TypeError exception when using star (``*``)
unpacking in function calls.  Based on patch by Hagen Fürstenau and Daniel
Urban.
..
.. bpo: 27138
.. date: 9656
.. nonce: ifYEro
.. section: Core and Builtins
Fix the doc comment for FileFinder.find_spec().
..
.. bpo: 26154
.. date: 9655
.. nonce: MtnRAH
.. section: Core and Builtins
Add a new private _PyThreadState_UncheckedGet() function to get the current
Python thread state, but don't issue a fatal error if it is NULL. This new
function must be used instead of accessing directly the
_PyThreadState_Current variable.  The variable is no more exposed since
Python 3.5.1 to hide the exact implementation of atomic C types, to avoid
compiler issues.
..
.. bpo: 26194
.. date: 9654
.. nonce: j9zand
.. section: Core and Builtins
Deque.insert() gave odd results for bounded deques that had reached their
maximum size.  Now an IndexError will be raised when attempting to insert
into a full deque.
..
.. bpo: 25843
.. date: 9653
.. nonce: t2kGug
.. section: Core and Builtins
When compiling code, don't merge constants if they are equal but have a
different types. For example, ``f1, f2 = lambda: 1, lambda: 1.0`` is now
correctly compiled to two different functions: ``f1()`` returns ``1``
(``int``) and ``f2()`` returns ``1.0`` (``int``), even if ``1`` and ``1.0``
are equal.
..
.. bpo: 22995
.. date: 9652
.. nonce: KYNKvs
.. section: Core and Builtins
[UPDATE] Comment out the one of the pickleability tests in
_PyObject_GetState() due to regressions observed in Cython-based projects.
..
.. bpo: 25961
.. date: 9651
.. nonce: Hdjjw0
.. section: Core and Builtins
Disallowed null characters in the type name.
..
.. bpo: 25973
.. date: 9650
.. nonce: Ud__ZP
.. section: Core and Builtins
Fix segfault when an invalid nonlocal statement binds a name starting with
two underscores.
..
.. bpo: 22995
.. date: 9649
.. nonce: Wq0E86
.. section: Core and Builtins
Instances of extension types with a state that aren't subclasses of list or
dict and haven't implemented any pickle-related methods (__reduce__,
__reduce_ex__, __getnewargs__, __getnewargs_ex__, or __getstate__), can no
longer be pickled.  Including memoryview.
..
.. bpo: 20440
.. date: 9648
.. nonce: GCwOfH
.. section: Core and Builtins
Massive replacing unsafe attribute setting code with special macro
Py_SETREF.
..
.. bpo: 25766
.. date: 9647
.. nonce: jn93Yu
.. section: Core and Builtins
Special method __bytes__() now works in str subclasses.
..
.. bpo: 25421
.. date: 9646
.. nonce: c47YEL
.. section: Core and Builtins
__sizeof__ methods of builtin types now use dynamic basic size. This allows
sys.getsize() to work correctly with their subclasses with __slots__
defined.
..
.. bpo: 25709
.. date: 9645
.. nonce: WwGm2k
.. section: Core and Builtins
Fixed problem with in-place string concatenation and utf-8 cache.
..
.. bpo: 27147
.. date: 9644
.. nonce: tCCgmH
.. section: Core and Builtins
Mention :pep:`420` in the importlib docs.
..
.. bpo: 24097
.. date: 9643
.. nonce: Vt4E-i
.. section: Core and Builtins
Fixed crash in object.__reduce__() if slot name is freed inside __getattr__.
..
.. bpo: 24731
.. date: 9642
.. nonce: h9-hnz
.. section: Core and Builtins
Fixed crash on converting objects with special methods __bytes__, __trunc__,
and __float__ returning instances of subclasses of bytes, int, and float to
subclasses of bytes, int, and float correspondingly.
..
.. bpo: 26478
.. date: 9641
.. nonce: n0dB8e
.. section: Core and Builtins
Fix semantic bugs when using binary operators with dictionary views and
tuples.
..
.. bpo: 26171
.. date: 9640
.. nonce: 8SaQEa
.. section: Core and Builtins
Fix possible integer overflow and heap corruption in zipimporter.get_data().
..
.. bpo: 25660
.. date: 9639
.. nonce: 93DzBo
.. section: Core and Builtins
Fix TAB key behaviour in REPL with readline.
..
.. bpo: 25887
.. date: 9638
.. nonce: PtVIX7
.. section: Core and Builtins
Raise a RuntimeError when a coroutine object is awaited more than once.
..
.. bpo: 27243
.. date: 9637
.. nonce: U36M4E
.. section: Core and Builtins
Update the __aiter__ protocol: instead of returning an awaitable that
resolves to an asynchronous iterator, the asynchronous iterator should be
returned directly.  Doing the former will trigger a
PendingDeprecationWarning.
..
.. bpo: 21386
.. date: 9634
.. nonce: DjV72U
.. section: Library
Implement missing IPv4Address.is_global property.  It was documented since
07a5610bae9d.  Initial patch by Roger Luethi.
..
.. bpo: 20900
.. date: 9633
.. nonce: H5YQPR
.. section: Library
distutils register command now decodes HTTP responses correctly.  Initial
patch by ingrid.
..
.. bpo: 0
.. date: 9632
.. nonce: iYIeng
.. section: Library
A new version of typing.py provides several new classes and features:
@overload outside stubs, Reversible, DefaultDict, Text, ContextManager,
Type[], NewType(), TYPE_CHECKING, and numerous bug fixes (note that some of
the new features are not yet implemented in mypy or other static analyzers).
Also classes for :pep:`492` (Awaitable, AsyncIterable, AsyncIterator) have been
added (in fact they made it into 3.5.1 but were never mentioned).
..
.. bpo: 25738
.. date: 9631
.. nonce: mED9w4
.. section: Library
Stop http.server.BaseHTTPRequestHandler.send_error() from sending a message
body for 205 Reset Content.  Also, don't send Content header fields in
responses that don't have a body.  Patch by Susumu Koshiba.
..
.. bpo: 21313
.. date: 9630
.. nonce: W30MBr
.. section: Library
Fix the "platform" module to tolerate when sys.version contains truncated
build information.
..
.. bpo: 27164
.. date: 9628
.. nonce: 6wmjx2
.. section: Library
In the zlib module, allow decompressing raw Deflate streams with a
predefined zdict.  Based on patch by Xiang Zhang.
..
.. bpo: 24291
.. date: 9627
.. nonce: Ac6HvL
.. section: Library
Fix wsgiref.simple_server.WSGIRequestHandler to completely write data to the
client.  Previously it could do partial writes and truncate data.  Also,
wsgiref.handler.ServerHandler can now handle stdout doing partial writes,
but this is deprecated.
..
.. bpo: 26809
.. date: 9626
.. nonce: ya7JMb
.. section: Library
Add ``__all__`` to :mod:`string`.  Patch by Emanuel Barry.
..
.. bpo: 26373
.. date: 9625
.. nonce: P6qz6o
.. section: Library
subprocess.Popen.communicate now correctly ignores BrokenPipeError when the
child process dies before .communicate() is called in more/all
circumstances.
..
.. bpo: 21776
.. date: 9624
.. nonce: 04eQfa
.. section: Library
distutils.upload now correctly handles HTTPError. Initial patch by Claudiu
Popa.
..
.. bpo: 27114
.. date: 9623
.. nonce: bGCuAM
.. section: Library
Fix SSLContext._load_windows_store_certs fails with PermissionError
..
.. bpo: 18383
.. date: 9622
.. nonce: jr-b0l
.. section: Library
Avoid creating duplicate filters when using filterwarnings and simplefilter.
Based on patch by Alex Shkop.
..
.. bpo: 27057
.. date: 9621
.. nonce: YzTA_Q
.. section: Library
Fix os.set_inheritable() on Android, ioctl() is blocked by SELinux and fails
with EACCESS. The function now falls back to fcntl(). Patch written by
Michał Bednarski.
..
.. bpo: 27014
.. date: 9620
.. nonce: ui7Khn
.. section: Library
Fix infinite recursion using typing.py.  Thanks to Kalle Tuure!
..
.. bpo: 14132
.. date: 9619
.. nonce: 5wR9MN
.. section: Library
Fix urllib.request redirect handling when the target only has a query
string.  Original fix by Ján Janech.
..
.. bpo: 17214
.. date: 9618
.. nonce: lUbZOV
.. section: Library
The "urllib.request" module now percent-encodes non-ASCII bytes found in
redirect target URLs.  Some servers send Location header fields with
non-ASCII bytes, but "http.client" requires the request target to be
ASCII-encodable, otherwise a UnicodeEncodeError is raised.  Based on patch by
Christian Heimes.
..
.. bpo: 26892
.. date: 9617
.. nonce: XIXb0h
.. section: Library
Honor debuglevel flag in urllib.request.HTTPHandler. Patch contributed by
Chi Hsuan Yen.
..
.. bpo: 22274
.. date: 9616
.. nonce: 0RHDMN
.. section: Library
In the subprocess module, allow stderr to be redirected to stdout even when
stdout is not redirected.  Patch by Akira Li.
..
.. bpo: 26807
.. date: 9615
.. nonce: LXSPP6
.. section: Library
mock_open 'files' no longer error on readline at end of file. Patch from
Yolanda Robla.
..
.. bpo: 25745
.. date: 9614
.. nonce: -n8acU
.. section: Library
Fixed leaking a userptr in curses panel destructor.
..
.. bpo: 26977
.. date: 9613
.. nonce: 5G4HtL
.. section: Library
Removed unnecessary, and ignored, call to sum of squares helper in
statistics.pvariance.
..
.. bpo: 26881
.. date: 9612
.. nonce: mdiq_L
.. section: Library
The modulefinder module now supports extended opcode arguments.
..
.. bpo: 23815
.. date: 9611
.. nonce: _krNe8
.. section: Library
Fixed crashes related to directly created instances of types in _tkinter and
curses.panel modules.
..
.. bpo: 17765
.. date: 9610
.. nonce: hiSVS1
.. section: Library
weakref.ref() no longer silently ignores keyword arguments. Patch by Georg
Brandl.
..
.. bpo: 26873
.. date: 9609
.. nonce: cYXRcH
.. section: Library
xmlrpc now raises ResponseError on unsupported type tags instead of silently
return incorrect result.
..
.. bpo: 26711
.. date: 9608
.. nonce: Eu85Qw
.. section: Library
Fixed the comparison of plistlib.Data with other types.
..
.. bpo: 24114
.. date: 9607
.. nonce: RMRMtM
.. section: Library
Fix an uninitialized variable in ``ctypes.util``.
The bug only occurs on SunOS when the ctypes implementation searches for the
``crle`` program.  Patch by Xiang Zhang.  Tested on SunOS by Kees Bos.
..
.. bpo: 26864
.. date: 9606
.. nonce: 1KgGds
.. section: Library
In urllib.request, change the proxy bypass host checking against no_proxy to
be case-insensitive, and to not match unrelated host names that happen to
have a bypassed hostname as a suffix.  Patch by Xiang Zhang.
..
.. bpo: 26634
.. date: 9605
.. nonce: FZvsSb
.. section: Library
recursive_repr() now sets __qualname__ of wrapper.  Patch by Xiang Zhang.
..
.. bpo: 26804
.. date: 9604
.. nonce: 9Orp-G
.. section: Library
urllib.request will prefer lower_case proxy environment variables over
UPPER_CASE or Mixed_Case ones. Patch contributed by Hans-Peter Jansen.
..
.. bpo: 26837
.. date: 9603
.. nonce: 2FXGsD
.. section: Library
assertSequenceEqual() now correctly outputs non-stringified differing items
(like bytes in the -b mode).  This affects assertListEqual() and
assertTupleEqual().
..
.. bpo: 26041
.. date: 9602
.. nonce: bVem-p
.. section: Library
Remove "will be removed in Python 3.7" from deprecation messages of
platform.dist() and platform.linux_distribution(). Patch by Kumaripaba
Miyurusara Athukorala.
..
.. bpo: 26822
.. date: 9601
.. nonce: rYSL4W
.. section: Library
itemgetter, attrgetter and methodcaller objects no longer silently ignore
keyword arguments.
..
.. bpo: 26733
.. date: 9600
.. nonce: YxaJmL
.. section: Library
Disassembling a class now disassembles class and static methods. Patch by
Xiang Zhang.
..
.. bpo: 26801
.. date: 9599
.. nonce: TQGY-7
.. section: Library
Fix error handling in :func:`shutil.get_terminal_size`, catch
:exc:`AttributeError` instead of :exc:`NameError`. Patch written by Emanuel
Barry.
..
.. bpo: 24838
.. date: 9598
.. nonce: 3Pfx8T
.. section: Library
tarfile's ustar and gnu formats now correctly calculate name and link field
limits for multibyte character encodings like utf-8.
..
.. bpo: 26717
.. date: 9596
.. nonce: jngTdu
.. section: Library
Stop encoding Latin-1-ized WSGI paths with UTF-8.  Patch by Anthony Sottile.
..
.. bpo: 26735
.. date: 9595
.. nonce: riSl3b
.. section: Library
Fix :func:`os.urandom` on Solaris 11.3 and newer when reading more than
1,024 bytes: call ``getrandom()`` multiple times with a limit of 1024 bytes
per call.
..
.. bpo: 16329
.. date: 9594
.. nonce: nuXD8W
.. section: Library
Add .webm to mimetypes.types_map.  Patch by Giampaolo Rodola'.
..
.. bpo: 13952
.. date: 9593
.. nonce: SOoTVE
.. section: Library
Add .csv to mimetypes.types_map.  Patch by Geoff Wilson.
..
.. bpo: 26709
.. date: 9592
.. nonce: luOPbP
.. section: Library
Fixed Y2038 problem in loading binary PLists.
..
.. bpo: 23735
.. date: 9591
.. nonce: Y5oQ9r
.. section: Library
Handle terminal resizing with Readline 6.3+ by installing our own SIGWINCH
handler.  Patch by Eric Price.
..
.. bpo: 26586
.. date: 9590
.. nonce: V5pZNa
.. section: Library
In http.server, respond with "413 Request header fields too large" if there
are too many header fields to parse, rather than killing the connection and
raising an unhandled exception.  Patch by Xiang Zhang.
..
.. bpo: 22854
.. date: 9589
.. nonce: K3rMEH
.. section: Library
Change BufferedReader.writable() and BufferedWriter.readable() to always
return False.
..
.. bpo: 25195
.. date: 9588
.. nonce: EOc4Po
.. section: Library
Fix a regression in mock.MagicMock. _Call is a subclass of tuple (changeset
3603bae63c13 only works for classes) so we need to implement __ne__
ourselves.  Patch by Andrew Plummer.
..
.. bpo: 26644
.. date: 9587
.. nonce: 7tt1tk
.. section: Library
Raise ValueError rather than SystemError when a negative length is passed to
SSLSocket.recv() or read().
..
.. bpo: 23804
.. date: 9586
.. nonce: PP63Ff
.. section: Library
Fix SSL recv(0) and read(0) methods to return zero bytes instead of up to
1024.
..
.. bpo: 26616
.. date: 9585
.. nonce: v3QwdD
.. section: Library
Fixed a bug in datetime.astimezone() method.
..
.. bpo: 21925
.. date: 9584
.. nonce: _fr69L
.. section: Library
:func:`warnings.formatwarning` now catches exceptions on
``linecache.getline(...)`` to be able to log :exc:`ResourceWarning` emitted
late during the Python shutdown process.
..
.. bpo: 24266
.. date: 9583
.. nonce: YZgVyM
.. section: Library
Ctrl+C during Readline history search now cancels the search mode when
compiled with Readline 7.
..
.. bpo: 26560
.. date: 9582
.. nonce: A4WXNz
.. section: Library
Avoid potential ValueError in BaseHandler.start_response. Initial patch by
Peter Inglesby.
..
.. bpo: 26569
.. date: 9580
.. nonce: EX8vF1
.. section: Library
Fix :func:`pyclbr.readmodule` and :func:`pyclbr.readmodule_ex` to support
importing packages.
..
.. bpo: 26499
.. date: 9579
.. nonce: NP08PI
.. section: Library
Account for remaining Content-Length in HTTPResponse.readline() and read1().
Based on patch by Silent Ghost. Also document that HTTPResponse now supports
these methods.
..
.. bpo: 25320
.. date: 9578
.. nonce: V96LIy
.. section: Library
Handle sockets in directories unittest discovery is scanning. Patch from
Victor van den Elzen.
..
.. bpo: 16181
.. date: 9577
.. nonce: P7lLvo
.. section: Library
cookiejar.http2time() now returns None if year is higher than
datetime.MAXYEAR.
..
.. bpo: 26513
.. date: 9576
.. nonce: HoPepy
.. section: Library
Fixes platform module detection of Windows Server
..
.. bpo: 23718
.. date: 9575
.. nonce: AMPC0o
.. section: Library
Fixed parsing time in week 0 before Jan 1.  Original patch by Tamás Bence
Gedai.
..
.. bpo: 20589
.. date: 9574
.. nonce: NsQ_I1
.. section: Library
Invoking Path.owner() and Path.group() on Windows now raise
NotImplementedError instead of ImportError.
..
.. bpo: 26177
.. date: 9573
.. nonce: HlSWer
.. section: Library
Fixed the keys() method for Canvas and Scrollbar widgets.
..
.. bpo: 15068
.. date: 9572
.. nonce: bcHtiw
.. section: Library
Got rid of excessive buffering in the fileinput module. The bufsize
parameter is no longer used.
..
.. bpo: 2202
.. date: 9571
.. nonce: dk9sd0
.. section: Library
Fix UnboundLocalError in AbstractDigestAuthHandler.get_algorithm_impls.
Initial patch by Mathieu Dupuy.
..
.. bpo: 25718
.. date: 9570
.. nonce: 4EjZyv
.. section: Library
Fixed pickling and copying the accumulate() iterator with total is None.
..
.. bpo: 26475
.. date: 9569
.. nonce: JXVccY
.. section: Library
Fixed debugging output for regular expressions with the (?x) flag.
..
.. bpo: 26457
.. date: 9568
.. nonce: Xe6Clh
.. section: Library
Fixed the subnets() methods in IP network classes for the case when
resulting prefix length is equal to maximal prefix length. Based on patch by
Xiang Zhang.
..
.. bpo: 26385
.. date: 9567
.. nonce: 50bDXm
.. section: Library
Remove the file if the internal open() call in NamedTemporaryFile() fails.
Patch by Silent Ghost.
..
.. bpo: 26402
.. date: 9566
.. nonce: k7DVuU
.. section: Library
Fix XML-RPC client to retry when the server shuts down a persistent
connection.  This was a regression related to the new
http.client.RemoteDisconnected exception in 3.5.0a4.
..
.. bpo: 25913
.. date: 9565
.. nonce: 5flb95
.. section: Library
Leading ``<~`` is optional now in base64.a85decode() with adobe=True.  Patch
by Swati Jaiswal.
..
.. bpo: 26186
.. date: 9564
.. nonce: R9rfiL
.. section: Library
Remove an invalid type check in importlib.util.LazyLoader.
..
.. bpo: 26367
.. date: 9563
.. nonce: ckpNeU
.. section: Library
importlib.__import__() raises SystemError like builtins.__import__() when
``level`` is specified but without an accompanying package specified.
..
.. bpo: 26309
.. date: 9562
.. nonce: ubEeiz
.. section: Library
In the "socketserver" module, shut down the request (closing the connected
socket) when verify_request() returns false.  Patch by Aviv Palivoda.
..
.. bpo: 25995
.. date: 9560
.. nonce: NfcimP
.. section: Library
os.walk() no longer uses FDs proportional to the tree depth.
..
.. bpo: 26117
.. date: 9559
.. nonce: ne6p11
.. section: Library
The os.scandir() iterator now closes file descriptor not only when the
iteration is finished, but when it was failed with error.
..
.. bpo: 25911
.. date: 9558
.. nonce: d4Zadh
.. section: Library
Restored support of bytes paths in os.walk() on Windows.
..
.. bpo: 26045
.. date: 9557
.. nonce: WmzUrX
.. section: Library
Add UTF-8 suggestion to error message when posting a non-Latin-1 string with
http.client.
..
.. bpo: 12923
.. date: 9556
.. nonce: HPAu-B
.. section: Library
Reset FancyURLopener's redirect counter even if there is an exception.
Based on patches by Brian Brazil and Daniel Rocco.
..
.. bpo: 25945
.. date: 9555
.. nonce: guNgNM
.. section: Library
Fixed a crash when unpickle the functools.partial object with wrong state.
Fixed a leak in failed functools.partial constructor. "args" and "keywords"
attributes of functools.partial have now always types tuple and dict
correspondingly.
..
.. bpo: 26202
.. date: 9554
.. nonce: LPIXLg
.. section: Library
copy.deepcopy() now correctly copies range() objects with non-atomic
attributes.
..
.. bpo: 23076
.. date: 9553
.. nonce: 8rphoP
.. section: Library
Path.glob() now raises a ValueError if it's called with an invalid pattern.
Patch by Thomas Nyberg.
..
.. bpo: 19883
.. date: 9552
.. nonce: z9TsO6
.. section: Library
Fixed possible integer overflows in zipimport.
..
.. bpo: 26227
.. date: 9551
.. nonce: Fe6oiB
.. section: Library
On Windows, getnameinfo(), gethostbyaddr() and gethostbyname_ex() functions
of the socket module now decode the hostname from the ANSI code page rather
than UTF-8.
..
.. bpo: 26147
.. date: 9550
.. nonce: i-Jc01
.. section: Library
xmlrpc now works with strings not encodable with used non-UTF-8 encoding.
..
.. bpo: 25935
.. date: 9549
.. nonce: cyni91
.. section: Library
Garbage collector now breaks reference loops with OrderedDict.
..
.. bpo: 16620
.. date: 9548
.. nonce: rxpn_Y
.. section: Library
Fixed AttributeError in msilib.Directory.glob().
..
.. bpo: 26013
.. date: 9547
.. nonce: 93RKNz
.. section: Library
Added compatibility with broken protocol 2 pickles created in old Python 3
versions (3.4.3 and lower).
..
.. bpo: 25850
.. date: 9546
.. nonce: jwFPxj
.. section: Library
Use cross-compilation by default for 64-bit Windows.
..
.. bpo: 17633
.. date: 9545
.. nonce: 9mpbUO
.. section: Library
Improve zipimport's support for namespace packages.
..
.. bpo: 24705
.. date: 9544
.. nonce: IZYwjR
.. section: Library
Fix sysconfig._parse_makefile not expanding ${} vars appearing before $()
vars.
..
.. bpo: 22138
.. date: 9543
.. nonce: nRNYkc
.. section: Library
Fix mock.patch behavior when patching descriptors. Restore original values
after patching. Patch contributed by Sean McCully.
..
.. bpo: 25672
.. date: 9542
.. nonce: fw9RJP
.. section: Library
In the ssl module, enable the SSL_MODE_RELEASE_BUFFERS mode option if it is
safe to do so.
..
.. bpo: 26012
.. date: 9541
.. nonce: IFSXNm
.. section: Library
Don't traverse into symlinks for ``**`` pattern in pathlib.Path.[r]glob().
..
.. bpo: 24120
.. date: 9540
.. nonce: Yiwa0h
.. section: Library
Ignore PermissionError when traversing a tree with pathlib.Path.[r]glob().
Patch by Ulrich Petri.
..
.. bpo: 25447
.. date: 9539
.. nonce: -4m4xO
.. section: Library
fileinput now uses sys.stdin as-is if it does not have a buffer attribute
(restores backward compatibility).
..
.. bpo: 25447
.. date: 9538
.. nonce: AtHkWA
.. section: Library
Copying the lru_cache() wrapper object now always works, independently from
the type of the wrapped object (by returning the original object unchanged).
..
.. bpo: 24103
.. date: 9537
.. nonce: WufqrQ
.. section: Library
Fixed possible use after free in ElementTree.XMLPullParser.
..
.. bpo: 25860
.. date: 9536
.. nonce: 0hActb
.. section: Library
os.fwalk() no longer skips remaining directories when error occurs.
Original patch by Samson Lee.
..
.. bpo: 25914
.. date: 9535
.. nonce: h0V61F
.. section: Library
Fixed and simplified OrderedDict.__sizeof__.
..
.. bpo: 25902
.. date: 9534
.. nonce: 6t2FmH
.. section: Library
Fixed various refcount issues in ElementTree iteration.
..
.. bpo: 25717
.. date: 9533
.. nonce: 0_xjaK
.. section: Library
Restore the previous behaviour of tolerating most fstat() errors when
opening files.  This was a regression in 3.5a1, and stopped anonymous
temporary files from working in special cases.
..
.. bpo: 24903
.. date: 9532
.. nonce: 3LBdzb
.. section: Library
Fix regression in number of arguments compileall accepts when '-d' is
specified.  The check on the number of arguments has been dropped completely
as it never worked correctly anyway.
..
.. bpo: 25764
.. date: 9531
.. nonce: 7WWG07
.. section: Library
In the subprocess module, preserve any exception caused by fork() failure
when preexec_fn is used.
..
.. bpo: 6478
.. date: 9530
.. nonce: -Bi9Hb
.. section: Library
_strptime's regexp cache now is reset after changing timezone with
time.tzset().
..
.. bpo: 14285
.. date: 9529
.. nonce: UyG8Hj
.. section: Library
When executing a package with the "python -m package" option, and package
initialization fails, a proper traceback is now reported.  The "runpy"
module now lets exceptions from package initialization pass back to the
caller, rather than raising ImportError.
..
.. bpo: 19771
.. date: 9528
.. nonce: 5NG-bg
.. section: Library
Also in runpy and the "-m" option, omit the irrelevant message ". . . is a
package and cannot be directly executed" if the package could not even be
initialized (e.g. due to a bad ``*.pyc`` file).
..
.. bpo: 25177
.. date: 9527
.. nonce: aNR4Ha
.. section: Library
Fixed problem with the mean of very small and very large numbers. As a side
effect, statistics.mean and statistics.variance should be significantly
faster.
..
.. bpo: 25718
.. date: 9526
.. nonce: D9mHZF
.. section: Library
Fixed copying object with state with boolean value is false.
..
.. bpo: 10131
.. date: 9525
.. nonce: a7tptz
.. section: Library
Fixed deep copying of minidom documents.  Based on patch by Marian Ganisin.
..
.. bpo: 25725
.. date: 9524
.. nonce: XIKv3R
.. section: Library
Fixed a reference leak in pickle.loads() when unpickling invalid data
including tuple instructions.
..
.. bpo: 25663
.. date: 9523
.. nonce: Ofwfqa
.. section: Library
In the Readline completer, avoid listing duplicate global names, and search
the global namespace before searching builtins.
..
.. bpo: 25688
.. date: 9522
.. nonce: 8P1HOv
.. section: Library
Fixed file leak in ElementTree.iterparse() raising an error.
..
.. bpo: 23914
.. date: 9521
.. nonce: 1sEz4J
.. section: Library
Fixed SystemError raised by unpickler on broken pickle data.
..
.. bpo: 25691
.. date: 9520
.. nonce: ZEaapY
.. section: Library
Fixed crash on deleting ElementTree.Element attributes.
..
.. bpo: 25624
.. date: 9519
.. nonce: ed-fM0
.. section: Library
ZipFile now always writes a ZIP_STORED header for directory entries.  Patch
by Dingyuan Wang.
..
.. bpo: 0
.. date: 9518
.. nonce: rtZyid
.. section: Library
Skip getaddrinfo if host is already resolved. Patch by A. Jesse Jiryu Davis.
..
.. bpo: 26050
.. date: 9517
.. nonce: sclyvk
.. section: Library
Add asyncio.StreamReader.readuntil() method. Patch by Марк Коренберг.
..
.. bpo: 25924
.. date: 9516
.. nonce: Uxr2vt
.. section: Library
Avoid unnecessary serialization of getaddrinfo(3) calls on OS X versions
10.5 or higher.  Original patch by A. Jesse Jiryu Davis.
..
.. bpo: 26406
.. date: 9515
.. nonce: ihvhF4
.. section: Library
Avoid unnecessary serialization of getaddrinfo(3) calls on current versions
of OpenBSD and NetBSD.  Patch by A. Jesse Jiryu Davis.
..
.. bpo: 26848
.. date: 9514
.. nonce: ChBOpQ
.. section: Library
Fix asyncio/subprocess.communicate() to handle empty input. Patch by Jack
O'Connor.
..
.. bpo: 27040
.. date: 9513
.. nonce: UASyCC
.. section: Library
Add loop.get_exception_handler method
..
.. bpo: 27041
.. date: 9512
.. nonce: p3893U
.. section: Library
asyncio: Add loop.create_future method
..
.. bpo: 27223
.. date: 9511
.. nonce: PRf4I6
.. section: Library
asyncio: Fix _read_ready and _write_ready to respect _conn_lost. Patch by
Łukasz Langa.
..
.. bpo: 22970
.. date: 9510
.. nonce: WhdhyM
.. section: Library
asyncio: Fix inconsistency cancelling Condition.wait. Patch by David Coles.
..
.. bpo: 5124
.. date: 9509
.. nonce: 4kwBvM
.. section: IDLE
Paste with text selected now replaces the selection on X11. This matches how
paste works on Windows, Mac, most modern Linux apps, and ttk widgets.
Original patch by Serhiy Storchaka.
..
.. bpo: 24759
.. date: 9508
.. nonce: ccmySu
.. section: IDLE
Make clear in idlelib.idle_test.__init__ that the directory is a private
implementation of test.test_idle and tool for maintainers.
..
.. bpo: 27196
.. date: 9507
.. nonce: 3yp8TF
.. section: IDLE
Stop 'ThemeChanged' warnings when running IDLE tests. These persisted after
other warnings were suppressed in #20567. Apply Serhiy Storchaka's
update_idletasks solution to four test files. Record this additional advice
in idle_test/README.txt
..
.. bpo: 20567
.. date: 9506
.. nonce: hhT32b
.. section: IDLE
Revise idle_test/README.txt with advice about avoiding tk warning messages
from tests.  Apply advice to several IDLE tests.
..
.. bpo: 27117
.. date: 9505
.. nonce: YrLPf4
.. section: IDLE
Make colorizer htest and turtledemo work with dark themes. Move code for
configuring text widget colors to a new function.
..
.. bpo: 26673
.. date: 9504
.. nonce: dh0_Ij
.. section: IDLE
When tk reports font size as 0, change to size 10. Such fonts on Linux
prevented the configuration dialog from opening.
..
.. bpo: 21939
.. date: 9503
.. nonce: pWz-OK
.. section: IDLE
Add test for IDLE's percolator. Original patch by Saimadhav Heblikar.
..
.. bpo: 21676
.. date: 9502
.. nonce: hqy6Qh
.. section: IDLE
Add test for IDLE's replace dialog. Original patch by Saimadhav Heblikar.
..
.. bpo: 18410
.. date: 9501
.. nonce: DLSPZo
.. section: IDLE
Add test for IDLE's search dialog. Original patch by Westley Martínez.
..
.. bpo: 21703
.. date: 9500
.. nonce: BAZfDM
.. section: IDLE
Add test for IDLE's undo delegator. Original patch by Saimadhav Heblikar .
..
.. bpo: 27044
.. date: 9499
.. nonce: 4y7tyM
.. section: IDLE
Add ConfigDialog.remove_var_callbacks to stop memory leaks.
..
.. bpo: 23977
.. date: 9498
.. nonce: miDjj8
.. section: IDLE
Add more asserts to test_delegator.
..
.. bpo: 20640
.. date: 9497
.. nonce: PmI-G8
.. section: IDLE
Add tests for idlelib.configHelpSourceEdit. Patch by Saimadhav Heblikar.
..
.. bpo: 0
.. date: 9496
.. nonce: _YJfG7
.. section: IDLE
In the 'IDLE-console differences' section of the IDLE doc, clarify how
running with IDLE affects sys.modules and the standard streams.
..
.. bpo: 25507
.. date: 9495
.. nonce: i8bNpk
.. section: IDLE
fix incorrect change in IOBinding that prevented printing. Augment IOBinding
htest to include all major IOBinding functions.
..
.. bpo: 25905
.. date: 9494
.. nonce: FzNb3B
.. section: IDLE
Revert unwanted conversion of ' to ’ RIGHT SINGLE QUOTATION MARK in
README.txt and open this and NEWS.txt with 'ascii'. Re-encode CREDITS.txt to
utf-8 and open it with 'utf-8'.
..
.. bpo: 19489
.. date: 9493
.. nonce: jvzuO7
.. section: Documentation
Moved the search box from the sidebar to the header and footer of each page.
Patch by Ammar Askar.
..
.. bpo: 24136
.. date: 9492
.. nonce: MUK0zK
.. section: Documentation
Document the new :pep:`448` unpacking syntax of 3.5.
..
.. bpo: 26736
.. date: 9491
.. nonce: U_Hyqo
.. section: Documentation
Used HTTPS for external links in the documentation if possible.
..
.. bpo: 6953
.. date: 9490
.. nonce: Zk6rno
.. section: Documentation
Rework the Readline module documentation to group related functions
together, and add more details such as what underlying Readline functions
and variables are accessed.
..
.. bpo: 23606
.. date: 9489
.. nonce: 9MhIso
.. section: Documentation
Adds note to ctypes documentation regarding cdll.msvcrt.
..
.. bpo: 25500
.. date: 9488
.. nonce: AV47eF
.. section: Documentation
Fix documentation to not claim that __import__ is searched for in the global
scope.
..
.. bpo: 26014
.. date: 9487
.. nonce: ptdZ_I
.. section: Documentation
Update 3.x packaging documentation: * "See also" links to the new docs are
now provided in the legacy pages * links to setuptools documentation have
been updated
..
.. bpo: 21916
.. date: 9486
.. nonce: muwCyp
.. section: Tests
Added tests for the turtle module.  Patch by ingrid, Gregory Loyse and Jelle
Zijlstra.
..
.. bpo: 26523
.. date: 9485
.. nonce: em_Uzt
.. section: Tests
The multiprocessing thread pool (multiprocessing.dummy.Pool) was untested.
..
.. bpo: 26015
.. date: 9484
.. nonce: p3oWK3
.. section: Tests
Added new tests for pickling iterators of mutable sequences.
..
.. bpo: 26325
.. date: 9483
.. nonce: KOUc82
.. section: Tests
Added test.support.check_no_resource_warning() to check that no
ResourceWarning is emitted.
..
.. bpo: 25940
.. date: 9482
.. nonce: PgiLVN
.. section: Tests
Changed test_ssl to use self-signed.pythontest.net.  This avoids relying on
svn.python.org, which recently changed root certificate.
..
.. bpo: 25616
.. date: 9481
.. nonce: Qr-60p
.. section: Tests
Tests for OrderedDict are extracted from test_collections into separate file
test_ordered_dict.
..
.. bpo: 26583
.. date: 9480
.. nonce: Up7hTl
.. section: Tests
Skip test_timestamp_overflow in test_import if bytecode files cannot be
written.
..
.. bpo: 26884
.. date: 9479
.. nonce: O8-azL
.. section: Build
Fix linking extension modules for cross builds. Patch by Xavier de Gaye.
..
.. bpo: 22359
.. date: 9478
.. nonce: HDjM4s
.. section: Build
Disable the rules for running _freeze_importlib and pgen when
cross-compiling.  The output of these programs is normally saved with the
source code anyway, and is still regenerated when doing a native build.
Patch by Xavier de Gaye.
..
.. bpo: 27229
.. date: 9477
.. nonce: C2NDch
.. section: Build
Fix the cross-compiling pgen rule for in-tree builds.  Patch by Xavier de
Gaye.
..
.. bpo: 21668
.. date: 9476
.. nonce: 4sMAa1
.. section: Build
Link audioop, _datetime, _ctypes_test modules to libm, except on Mac OS X.
Patch written by Xavier de Gaye.
..
.. bpo: 25702
.. date: 9475
.. nonce: ipxyJs
.. section: Build
A --with-lto configure option has been added that will enable link time
optimizations at build time during a make profile-opt. Some compilers and
toolchains are known to not produce stable code when using LTO, be sure to
test things thoroughly before relying on it. It can provide a few % speed up
over profile-opt alone.
..
.. bpo: 26624
.. date: 9474
.. nonce: 4fGrTl
.. section: Build
Adds validation of ucrtbase[d].dll version with warning for old versions.
..
.. bpo: 17603
.. date: 9473
.. nonce: 102DA-
.. section: Build
Avoid error about nonexistent fileblocks.o file by using a lower-level check
for st_blocks in struct stat.
..
.. bpo: 26079
.. date: 9472
.. nonce: mEzW0O
.. section: Build
Fixing the build output folder for tix-8.4.3.6. Patch by Bjoern Thiel.
..
.. bpo: 26465
.. date: 9471
.. nonce: _YR608
.. section: Build
Update Windows builds to use OpenSSL 1.0.2g.
..
.. bpo: 24421
.. date: 9470
.. nonce: 2zY7vM
.. section: Build
Compile Modules/_math.c once, before building extensions. Previously it
could fail to compile properly if the math and cmath builds were concurrent.
..
.. bpo: 25348
.. date: 9469
.. nonce: u6_BaQ
.. section: Build
Added ``--pgo`` and ``--pgo-job`` arguments to ``PCbuild\build.bat`` for
building with Profile-Guided Optimization.  The old
``PCbuild\build_pgo.bat`` script is now deprecated, and simply calls
``PCbuild\build.bat --pgo %*``.
..
.. bpo: 25827
.. date: 9468
.. nonce: yg3DMM
.. section: Build
Add support for building with ICC to ``configure``, including a new
``--with-icc`` flag.
..
.. bpo: 25696
.. date: 9467
.. nonce: 2R_wIv
.. section: Build
Fix installation of Python on UNIX with make -j9.
..
.. bpo: 26930
.. date: 9466
.. nonce: Sqz2O3
.. section: Build
Update OS X 10.5+ 32-bit-only installer to build and link with OpenSSL
1.0.2h.
..
.. bpo: 26268
.. date: 9465
.. nonce: I3-YLh
.. section: Build
Update Windows builds to use OpenSSL 1.0.2f.
..
.. bpo: 25136
.. date: 9464
.. nonce: Vi-fmO
.. section: Build
Support Apple Xcode 7's new textual SDK stub libraries.
..
.. bpo: 24324
.. date: 9463
.. nonce: m6DZMx
.. section: Build
Do not enable unreachable code warnings when using gcc as the option does
not work correctly in older versions of gcc and has been silently removed as
of gcc-4.5.
..
.. bpo: 27053
.. date: 9462
.. nonce: 1IRbae
.. section: Windows
Updates make_zip.py to correctly generate library ZIP file.
..
.. bpo: 26268
.. date: 9461
.. nonce: Z-lJEh
.. section: Windows
Update the prepare_ssl.py script to handle OpenSSL releases that don't
include the contents of the include directory (that is, 1.0.2e and later).
..
.. bpo: 26071
.. date: 9460
.. nonce: wLxL2l
.. section: Windows
bdist_wininst created binaries fail to start and find 32bit Python
..
.. bpo: 26073
.. date: 9459
.. nonce: XwWgHp
.. section: Windows
Update the list of magic numbers in launcher
..
.. bpo: 26065
.. date: 9458
.. nonce: SkVLJp
.. section: Windows
Excludes venv from library when generating embeddable distro.
..
.. bpo: 17500
.. date: 9453
.. nonce: QTZbRV
.. section: Windows
Remove unused and outdated icons. (See also:
https://github.com/python/pythondotorg/issues/945)
..
.. bpo: 26799
.. date: 9457
.. nonce: gK2VXX
.. section: Tools/Demos
Fix python-gdb.py: don't get C types once when the Python code is loaded,
but get C types on demand. The C types can change if python-gdb.py is loaded
before the Python executable. Patch written by Thomas Ilsche.
..
.. bpo: 26271
.. date: 9456
.. nonce: wg-rzr
.. section: Tools/Demos
Fix the Freeze tool to properly use flags passed through configure. Patch by
Daniel Shaulov.
..
.. bpo: 26489
.. date: 9455
.. nonce: rJ_U5S
.. section: Tools/Demos
Add dictionary unpacking support to Tools/parser/unparse.py. Patch by Guo Ci
Teo.
..
.. bpo: 26316
.. date: 9454
.. nonce: QJvVOi
.. section: Tools/Demos
Fix variable name typo in Argument Clinic.

.. date: 2023-02-17-10-42-48
.. gh-issue: 99108
.. nonce: MKA8-f
.. release date: 2023-03-07
.. section: Security
Replace builtin hashlib implementations of MD5 and SHA1 with verified ones
from the HACL* project.
..
.. date: 2023-02-08-22-03-04
.. gh-issue: 101727
.. nonce: 9P5eZz
.. section: Security
Updated the OpenSSL version used in Windows and macOS binary release builds
to 1.1.1t to address :cve:`2023-0286`, :cve:`2022-4303`, and :cve:`2022-4303` per
`the OpenSSL 2023-02-07 security advisory
<https://openssl-library.org/news/secadv/20230207.txt>`_.
..
.. date: 2023-02-08-12-57-35
.. gh-issue: 99108
.. nonce: 6tnmhA
.. section: Security
Replace the builtin :mod:`hashlib` implementations of SHA2-384 and SHA2-512
originally from LibTomCrypt with formally verified, side-channel resistant
code from the `HACL* <https://github.com/hacl-star/hacl-star/>`_ project.
The builtins remain a fallback only used when OpenSSL does not provide them.
..
.. date: 2023-01-24-16-12-00
.. gh-issue: 101283
.. nonce: 9tqu39
.. section: Security
:class:`subprocess.Popen` now uses a safer approach to find ``cmd.exe`` when
launching with ``shell=True``. Patch by Eryk Sun, based on a patch by Oleg
Iarygin.
..
.. date: 2023-03-07-16-56-28
.. gh-issue: 102493
.. nonce: gTXrcD
.. section: Core and Builtins
Fix regression in semantics of normalisation in ``PyErr_SetObject``.
..
.. date: 2023-03-06-13-05-33
.. gh-issue: 102416
.. nonce: dz6K5f
.. section: Core and Builtins
Do not memoize incorrectly automatically generated loop rules in the parser.
Patch by Pablo Galindo.
..
.. date: 2023-03-04-20-56-12
.. gh-issue: 102356
.. nonce: 07KvUd
.. section: Core and Builtins
Fix a bug that caused a crash when deallocating deeply nested filter
objects. Patch by Marta Gómez Macías.
..
.. date: 2023-02-28-21-17-03
.. gh-issue: 102336
.. nonce: -wL3Tm
.. section: Core and Builtins
Cleanup Windows 7 specific special handling. Patch by Max Bachmann.
..
.. date: 2023-02-26-23-10-32
.. gh-issue: 102250
.. nonce: 7MUKoC
.. section: Core and Builtins
Fixed a segfault occurring when the interpreter calls a ``__bool__`` method
that raises.
..
.. date: 2023-02-24-17-59-39
.. gh-issue: 102126
.. nonce: HTT8Vc
.. section: Core and Builtins
Fix deadlock at shutdown when clearing thread states if any finalizer tries
to acquire the runtime head lock. Patch by Kumar Aditya.
..
.. date: 2023-02-22-15-15-32
.. gh-issue: 102027
.. nonce: Km4G-d
.. section: Core and Builtins
Use ``GetCurrentProcessId`` on Windows when ``getpid`` is unavailable. Patch
by Max Bachmann.
..
.. date: 2023-02-20-15-18-33
.. gh-issue: 102056
.. nonce: uHKuwH
.. section: Core and Builtins
Fix error handling bugs in interpreter's exception printing code, which
could cause a crash on infinite recursion.
..
.. date: 2023-02-17-10-12-13
.. gh-issue: 100982
.. nonce: mJGJQw
.. section: Core and Builtins
Restrict the scope of the :opcode:`FOR_ITER_RANGE` instruction to the scope
of the original :opcode:`FOR_ITER` instruction, to allow instrumentation.
..
.. date: 2023-02-16-23-19-01
.. gh-issue: 101967
.. nonce: Kqr1dz
.. section: Core and Builtins
Fix possible segfault in ``positional_only_passed_as_keyword`` function,
when new list created.
..
.. date: 2023-02-16-16-57-23
.. gh-issue: 101952
.. nonce: Zo1dlq
.. section: Core and Builtins
Fix possible segfault in ``BUILD_SET`` opcode, when new set created.
..
.. date: 2023-02-13-22-21-58
.. gh-issue: 74895
.. nonce: esMNtq
.. section: Core and Builtins
:mod:`socket.getaddrinfo` no longer raises :class:`OverflowError` for
:class:`int` **port** values outside of the C long range. Out of range
values are left up to the underlying string based C library API to report. A
:class:`socket.gaierror` ``SAI_SERVICE`` may occur instead, or no error at
all as not all platform C libraries generate an error.
..
.. date: 2023-02-13-18-21-14
.. gh-issue: 101799
.. nonce: wpHbCn
.. section: Core and Builtins
Add :opcode:`CALL_INTRINSIC_2` and use it instead of
:opcode:`!PREP_RERAISE_STAR`.
..
.. date: 2023-02-12-22-40-22
.. gh-issue: 101857
.. nonce: _bribG
.. section: Core and Builtins
Fix xattr support detection on Linux systems by widening the check to linux,
not just glibc. This fixes support for musl.
..
.. date: 2023-02-11-23-14-06
.. gh-issue: 84783
.. nonce: _P5sMa
.. section: Core and Builtins
Make the slice object hashable. Patch by Will Bradshaw and Furkan Onder.
..
.. date: 2023-02-10-15-54-57
.. gh-issue: 87849
.. nonce: IUVvPz
.. section: Core and Builtins
Change the ``SEND`` instruction to leave the receiver on the stack. This
allows the specialized form of ``SEND`` to skip the chain of C calls and
jump directly to the ``RESUME`` in the generator or coroutine.
..
.. date: 2023-02-10-07-21-47
.. gh-issue: 101765
.. nonce: MO5LlC
.. section: Core and Builtins
Fix SystemError / segmentation fault in iter ``__reduce__`` when internal
access of ``builtins.__dict__`` keys mutates the iter object.
..
.. date: 2023-02-10-01-15-57
.. gh-issue: 101430
.. nonce: T3Gegb
.. section: Core and Builtins
Update :mod:`tracemalloc` to handle presize of object properly. Patch by
Donghee Na.
..
.. date: 2023-02-08-17-13-31
.. gh-issue: 101696
.. nonce: seJhTt
.. section: Core and Builtins
Invalidate type version tag in ``_PyStaticType_Dealloc`` for static types,
avoiding bug where a false cache hit could crash the interpreter. Patch by
Kumar Aditya.
..
.. date: 2023-02-07-14-56-43
.. gh-issue: 101632
.. nonce: Fd1yxk
.. section: Core and Builtins
Adds a new :opcode:`RETURN_CONST` instruction.
..
.. date: 2023-01-04-12-49-33
.. gh-issue: 100719
.. nonce: uRPccL
.. section: Core and Builtins
Remove gi_code field from generator (and coroutine and async generator)
objects as it is redundant. The frame already includes a reference to the
code object.
..
.. date: 2022-11-02-20-23-47
.. gh-issue: 98627
.. nonce: VJkdRM
.. section: Core and Builtins
When an interpreter is configured to check (and only then), importing an
extension module will now fail when the extension does not support multiple
interpreters (i.e. doesn't implement PEP 489 multi-phase init). This does
not apply to the main interpreter, nor to subinterpreters created with
``Py_NewInterpreter()``.
..
.. date: 2023-03-04-14-46-47
.. gh-issue: 102302
.. nonce: -b_s6Z
.. section: Library
Micro-optimise hashing of :class:`inspect.Parameter`, reducing the time it
takes to hash an instance by around 40%.
..
.. date: 2023-02-28-09-52-25
.. gh-issue: 101979
.. nonce: or3hXV
.. section: Library
Fix a bug where parentheses in the ``metavar`` argument to
:meth:`argparse.ArgumentParser.add_argument` were dropped. Patch by Yeojin
Kim.
..
.. date: 2023-02-26-12-37-17
.. gh-issue: 91038
.. nonce: S4rFH_
.. section: Library
:meth:`platform.platform` now has boolean default arguments.
..
.. date: 2023-02-23-20-39-52
.. gh-issue: 81652
.. nonce: Vxz0Mr
.. section: Library
Add :const:`mmap.MAP_ALIGNED_SUPER` FreeBSD and :const:`mmap.MAP_CONCEAL`
OpenBSD constants to :mod:`mmap`. Patch by Yeojin Kim.
..
.. date: 2023-02-23-15-06-01
.. gh-issue: 102179
.. nonce: P6KQ4c
.. section: Library
Fix :func:`os.dup2` error message for negative fds.
..
.. date: 2023-02-21-10-05-33
.. gh-issue: 101961
.. nonce: 7e56jh
.. section: Library
For the binary mode, :func:`fileinput.hookcompressed` doesn't set the
``encoding`` value even if the value is ``None``. Patch by Gihwan Kim.
..
.. date: 2023-02-21-07-15-41
.. gh-issue: 101936
.. nonce: QVOxHH
.. section: Library
The default value of ``fp`` becomes :class:`io.BytesIO` if
:exc:`~urllib.error.HTTPError` is initialized without a designated ``fp``
parameter. Patch by Long Vo.
..
.. date: 2023-02-17-20-24-15
.. gh-issue: 101566
.. nonce: FjgWBt
.. section: Library
In zipfile, sync Path with `zipp 3.14
<https://zipp.readthedocs.io/en/latest/history.html#v3-14-0>`_, including
fix for extractall on the underlying zipfile after being wrapped in
``Path``.
..
.. date: 2023-02-17-19-00-58
.. gh-issue: 97930
.. nonce: C_nQjb
.. section: Library
Apply changes from `importlib_resources 5.12
<https://importlib-resources.readthedocs.io/en/latest/history.html#v5-12-0>`_,
including fix for ``MultiplexedPath`` to support directories in multiple
namespaces (python/importlib_resources#265).
..
.. date: 2023-02-17-18-44-27
.. gh-issue: 101997
.. nonce: A6_blD
.. section: Library
Upgrade pip wheel bundled with ensurepip (pip 23.0.1)
..
.. date: 2023-02-15-01-54-06
.. gh-issue: 99108
.. nonce: rjTSic
.. section: Library
The built-in extension modules for :mod:`hashlib` SHA2 algorithms, used when
OpenSSL does not provide them, now live in a single internal ``_sha2``
module instead of separate ``_sha256`` and ``_sha512`` modules.
..
.. date: 2023-02-14-09-08-48
.. gh-issue: 101892
.. nonce: FMos8l
.. section: Library
Callable iterators no longer raise :class:`SystemError` when the callable
object exhausts the iterator but forgets to either return a sentinel value
or raise :class:`StopIteration`.
..
.. date: 2023-02-13-12-55-48
.. gh-issue: 87634
.. nonce: q-SBhJ
.. section: Library
Remove locking behavior from :func:`functools.cached_property`.
..
.. date: 2023-02-11-13-23-29
.. gh-issue: 97786
.. nonce: QjvQ1B
.. section: Library
Fix potential undefined behaviour in corner cases of floating-point-to-time
conversions.
..
.. date: 2023-02-10-16-02-29
.. gh-issue: 101517
.. nonce: r7S2u8
.. section: Library
Fixed bug where :mod:`bdb` looks up the source line with :mod:`linecache`
with a ``lineno=None``, which causes it to fail with an unhandled exception.
..
.. date: 2023-02-10-11-59-13
.. gh-issue: 101773
.. nonce: J_kI7y
.. section: Library
Optimize :class:`fractions.Fraction` for small components. The private
argument ``_normalize`` of the :class:`fractions.Fraction` constructor has
been removed.
..
.. date: 2023-02-08-18-20-58
.. gh-issue: 101693
.. nonce: 4_LPXj
.. section: Library
In :meth:`sqlite3.Cursor.execute`, :exc:`DeprecationWarning` is now emitted
when :ref:`named placeholders <sqlite3-placeholders>` are used together with
parameters supplied as a :term:`sequence` instead of as a :class:`dict`.
Starting from Python 3.14, using named placeholders with parameters supplied
as a sequence will raise a :exc:`~sqlite3.ProgrammingError`. Patch by Erlend
E. Aasland.
..
.. date: 2023-02-07-22-21-46
.. gh-issue: 101446
.. nonce: -c0FdK
.. section: Library
Change repr of :class:`collections.OrderedDict` to use regular dictionary
formatting instead of pairs of keys and values.
..
.. date: 2023-02-07-22-20-32
.. gh-issue: 101362
.. nonce: Jlk6mt
.. section: Library
Speed up :class:`pathlib.PurePath` construction by handling arguments more
uniformly. When a :class:`pathlib.Path` argument is supplied, we use its
string representation rather than joining its parts with
:func:`os.path.join`.
..
.. date: 2023-02-07-21-16-41
.. gh-issue: 101362
.. nonce: KMQllM
.. section: Library
Speed up :class:`pathlib.PurePath` construction by calling
:func:`os.path.join` only when two or more arguments are given.
..
.. date: 2023-02-07-20-46-08
.. gh-issue: 101362
.. nonce: 2ckZ6R
.. section: Library
Speed up :class:`pathlib.Path` construction by running the path flavour
compatibility check only when pathlib is imported.
..
.. date: 2023-02-05-21-40-15
.. gh-issue: 85984
.. nonce: Kfzbb2
.. section: Library
Refactored the implementation of :func:`pty.fork` to use
:func:`os.login_tty`.
A :exc:`DeprecationWarning` is now raised by ``pty.master_open()`` and
``pty.slave_open()``. They were undocumented and deprecated long long ago in
the docstring in favor of :func:`pty.openpty`.
..
.. date: 2023-02-04-16-35-46
.. gh-issue: 101561
.. nonce: Xo6pIZ
.. section: Library
Add a new decorator :func:`typing.override`. See :pep:`698` for details.
Patch by Steven Troxler.
..
.. date: 2023-02-01-10-42-16
.. gh-issue: 63301
.. nonce: XNxSFh
.. section: Library
Set exit code when :mod:`tabnanny` CLI exits on error.
..
.. date: 2023-01-27-02-53-50
.. gh-issue: 101360
.. nonce: bPB7SL
.. section: Library
Fix anchor matching in :meth:`pathlib.PureWindowsPath.match`. Path and
pattern anchors are now matched with :mod:`fnmatch`, just like other path
parts. This allows patterns such as ``"*:/Users/*"`` to be matched.
..
.. date: 2023-01-25-00-14-52
.. gh-issue: 101277
.. nonce: FceHX7
.. section: Library
Remove global state from :mod:`itertools` module (:pep:`687`). Patches by
Erlend E. Aasland.
..
.. date: 2023-01-06-21-14-41
.. gh-issue: 100809
.. nonce: I697UT
.. section: Library
Fix handling of drive-relative paths (like 'C:' and 'C:foo') in
:meth:`pathlib.Path.absolute`. This method now uses the OS API to retrieve
the correct current working directory for the drive.
..
.. date: 2023-01-02-22-41-44
.. gh-issue: 99138
.. nonce: 17hp9U
.. section: Library
Apply :pep:`687` to :mod:`zoneinfo`. Patch by Erlend E. Aasland.
..
.. date: 2022-10-22-09-26-43
.. gh-issue: 96764
.. nonce: Dh9Y5L
.. section: Library
:func:`asyncio.wait_for` now uses :func:`asyncio.timeout` as its underlying
implementation. Patch by Kumar Aditya.
..
.. date: 2022-09-05-12-17-34
.. gh-issue: 88233
.. nonce: gff9qJ
.. section: Library
Correctly preserve "extra" fields in ``zipfile`` regardless of their
ordering relative to a zip64 "extra."
..
.. bpo: 23224
.. date: 2018-06-20-09-12-21
.. nonce: zxCQ13
.. section: Library
Fix segfaults when creating :class:`lzma.LZMADecompressor` and
:class:`bz2.BZ2Decompressor` objects without calling ``__init__()``, and fix
leakage of locks and internal buffers when calling the ``__init__()``
methods of :class:`lzma.LZMADecompressor`, :class:`lzma.LZMACompressor`,
:class:`bz2.BZ2Compressor`, and :class:`bz2.BZ2Decompressor` objects
multiple times.
..
.. date: 2023-02-19-10-33-01
.. gh-issue: 85417
.. nonce: kYO8u3
.. section: Documentation
Update :mod:`cmath` documentation to clarify behaviour on branch cuts.
..
.. date: 2023-02-07-21-43-24
.. gh-issue: 97725
.. nonce: cuY7Cd
.. section: Documentation
Fix :meth:`asyncio.Task.print_stack` description for ``file=None``. Patch by
Oleg Iarygin.
..
.. date: 2023-02-18-10-51-02
.. gh-issue: 102019
.. nonce: 0797SJ
.. section: Tests
Fix deadlock on shutdown if ``test_current_{exception,frames}`` fails. Patch
by Jacob Bower.
..
.. date: 2023-02-11-22-36-10
.. gh-issue: 85984
.. nonce: EVXjT9
.. section: Tests
Utilize new "winsize" functions from termios in pty tests.
..
.. date: 2023-02-11-20-28-08
.. gh-issue: 89792
.. nonce: S-Y5BZ
.. section: Tests
``test_tools`` now copies up to 10x less source data to a temporary
directory during the ``freeze`` test by ignoring git metadata and other
artifacts.  It also limits its python build parallelism based on
os.cpu_count instead of hard coding it as 8 cores.
..
.. date: 2023-01-12-00-49-16
.. gh-issue: 99942
.. nonce: DUR8b4
.. section: Build
On Android, in a static build, python-config in embed mode no longer
incorrectly reports a library to link to.
..
.. date: 2022-12-20-01-06-17
.. gh-issue: 99942
.. nonce: lbmzYj
.. section: Build
On Android, python.pc now correctly reports the library to link to, the same
as python-config.sh.
..
.. date: 2022-12-18-08-33-28
.. gh-issue: 100221
.. nonce: K94Ct3
.. section: Build
Fix creating install directories in ``make sharedinstall`` if they exist
outside ``DESTDIR`` already.
..
.. date: 2022-09-14-10-38-15
.. gh-issue: 96821
.. nonce: Zk2a9c
.. section: Build
Explicitly mark C extension modules that need defined signed integer
overflow, and add a configure option :option:`--with-strict-overflow`. Patch
by Matthias Görgens and Shantanu Jain.
..
.. date: 2023-03-01-01-36-39
.. gh-issue: 102344
.. nonce: Dgfux4
.. section: Windows
Implement ``winreg.QueryValue`` using ``QueryValueEx`` and
``winreg.SetValue`` using ``SetValueEx``. Patch by Max Bachmann.
..
.. date: 2023-02-15-11-08-10
.. gh-issue: 101881
.. nonce: fScr3m
.. section: Windows
Handle read and write operations on non-blocking pipes properly on Windows.
..
.. date: 2023-02-13-18-05-49
.. gh-issue: 101881
.. nonce: _TnHzN
.. section: Windows
Add support for the os.get_blocking() and os.set_blocking() functions on
Windows.
..
.. date: 2023-02-13-16-32-50
.. gh-issue: 101849
.. nonce: 7lm_53
.. section: Windows
Ensures installer will correctly upgrade existing ``py.exe`` launcher
installs.
..
.. date: 2023-02-10-14-26-05
.. gh-issue: 101763
.. nonce: RPaj7r
.. section: Windows
Updates copy of libffi bundled with Windows installs to 3.4.4.
..
.. date: 2023-02-09-22-09-27
.. gh-issue: 101759
.. nonce: zFlqSH
.. section: Windows
Update Windows installer to SQLite 3.40.1.
..
.. date: 2023-02-07-18-22-54
.. gh-issue: 101614
.. nonce: NjVP0n
.. section: Windows
Correctly handle extensions built against debug binaries that reference
``python3_d.dll``.
..
.. date: 2023-01-25-11-33-54
.. gh-issue: 101196
.. nonce: wAX_2g
.. section: Windows
The functions ``os.path.isdir``, ``os.path.isfile``, ``os.path.islink`` and
``os.path.exists`` are now 13% to 28% faster on Windows, by making fewer
Win32 API calls.
..
.. date: 2023-02-09-22-07-17
.. gh-issue: 101759
.. nonce: B0JP2H
.. section: macOS
Update macOS installer to SQLite 3.40.1.
..
.. date: 2023-02-14-15-53-01
.. gh-issue: 101907
.. nonce: HgF1N2
.. section: C API
Removes use of non-standard C++ extension in public header files.
..
.. date: 2023-02-09-10-38-20
.. gh-issue: 99293
.. nonce: mFqfpp
.. section: C API
Document that the Py_TPFLAGS_VALID_VERSION_TAG is an internal feature,
should not be used, and will be removed.
..
.. date: 2023-02-06-16-14-30
.. gh-issue: 101578
.. nonce: PW5fA9
.. section: C API
Add :c:func:`PyErr_GetRaisedException` and
:c:func:`PyErr_SetRaisedException` for saving and restoring the current
exception. These functions return and accept a single exception object,
rather than the triple arguments of the now-deprecated :c:func:`PyErr_Fetch`
and :c:func:`PyErr_Restore`. This is less error prone and a bit more
efficient.
Add :c:func:`PyException_GetArgs` and :c:func:`PyException_SetArgs` as
convenience functions for retrieving and modifying the
:attr:`~BaseException.args` passed to the exception's constructor.
..
.. date: 2022-04-21-17-25-22
.. gh-issue: 91744
.. nonce: FgvaMi
.. section: C API
Introduced the *Unstable C API tier*, marking APi that is allowed to change
in minor releases without a deprecation period. See :pep:`689` for details.

.. bpo: 45716
.. date: 2021-11-04-20-19-07
.. nonce: 5C0pA1
.. release date: 2021-11-05
.. section: Core and Builtins
Improve the :exc:`SyntaxError` message when using ``True``, ``None`` or
``False`` as keywords in a function call. Patch by Pablo Galindo.
..
.. bpo: 45688
.. date: 2021-11-02-09-27-46
.. nonce: v5Der1
.. section: Core and Builtins
:data:`sys.stdlib_module_names` now contains the macOS-specific module
:mod:`!_scproxy`.
..
.. bpo: 45379
.. date: 2021-10-23-13-49-00
.. nonce: ZF7G3n
.. section: Core and Builtins
Clarify :exc:`ImportError` message when we try to explicitly import a frozen
module but frozen modules are disabled.
..
.. bpo: 44525
.. date: 2021-10-20-11-57-31
.. nonce: veL4lJ
.. section: Core and Builtins
Specialize simple calls to Python functions (no starargs, keyword dict, or
closure)
..
.. bpo: 45530
.. date: 2021-10-20-01-28-26
.. nonce: 5r7n4m
.. section: Core and Builtins
Cases of sorting using tuples as keys may now be significantly faster in
some cases. Patch by Tim Peters.
The order of the result may differ from earlier releases if the tuple
elements don't define a total ordering (see
:ref:`expressions-value-comparisons` for information on total ordering).
It's generally true that the result of sorting simply isn't well-defined in
the absence of a total ordering on list elements.
..
.. bpo: 45526
.. date: 2021-10-19-10-29-47
.. nonce: WQnvW9
.. section: Core and Builtins
In obmalloc, set ADDRESS_BITS to not ignore any bits (ignored 16 before).
That is safer in the case that the kernel gives user-space virtual addresses
that span a range greater than 48 bits.
..
.. bpo: 30570
.. date: 2021-10-19-01-04-08
.. nonce: _G30Ms
.. section: Core and Builtins
Fixed a crash in ``issubclass()`` from infinite recursion when searching
pathological ``__bases__`` tuples.
..
.. bpo: 45521
.. date: 2021-10-18-22-40-33
.. nonce: GdMiuW
.. section: Core and Builtins
Fix a bug in the obmalloc radix tree code.  On 64-bit machines, the bug
causes the tree to hold 46-bits of virtual addresses, rather than the
intended 48-bits.
..
.. bpo: 45494
.. date: 2021-10-16-17-27-48
.. nonce: vMt1g4
.. section: Core and Builtins
Fix parser crash when reporting errors involving invalid continuation
characters. Patch by Pablo Galindo.
..
.. bpo: 45445
.. date: 2021-10-12-14-41-39
.. nonce: _F5cMf
.. section: Core and Builtins
Python now fails to initialize if it finds an invalid :option:`-X` option in
the command line. Patch by Pablo Galindo.
..
.. bpo: 45340
.. date: 2021-10-08-09-47-38
.. nonce: ukHgDb
.. section: Core and Builtins
Object attributes are held in an array instead of a dictionary. An object's
dictionary are created lazily, only when needed. Reduces the memory
consumption of a typical Python object by about 30%. Patch by Mark Shannon.
..
.. bpo: 45408
.. date: 2021-10-07-21-26-44
.. nonce: qUqzcd
.. section: Core and Builtins
Fix a crash in the parser when reporting tokenizer errors that occur at the
same time unclosed parentheses are detected. Patch by Pablo Galindo.
..
.. bpo: 29410
.. date: 2021-10-07-19-09-12
.. nonce: bg5SYp
.. section: Core and Builtins
Add SipHash13 for string hash algorithm and use it by default.
..
.. bpo: 45385
.. date: 2021-10-06-21-20-11
.. nonce: CTUT8s
.. section: Core and Builtins
Fix reference leak from descr_check. Patch by Donghee Na.
..
.. bpo: 45367
.. date: 2021-10-05-03-49-07
.. nonce: _astoU
.. section: Core and Builtins
Specialized the ``BINARY_MULTIPLY`` opcode to ``BINARY_MULTIPLY_INT`` and
``BINARY_MULTIPLY_FLOAT`` using the PEP 659 machinery.
..
.. bpo: 21736
.. date: 2021-10-01-09-21-02
.. nonce: RI47BU
.. section: Core and Builtins
Frozen stdlib modules now have ``__file__`` to the .py file they would
otherwise be loaded from, if possible.  For packages, ``__path__`` now has
the correct entry instead of being an empty list, which allows unfrozen
submodules to be imported.  These are set only if the stdlib directory is
known when the runtime is initialized.  Note that the file at ``__file__``
is not guaranteed to exist.  None of this affects non-stdlib frozen modules
nor, for now, frozen modules imported using
``PyImport_ImportFrozenModule()``.  Also, at the moment ``co_filename`` is
not updated for the module.
..
.. bpo: 45020
.. date: 2021-10-01-09-06-54
.. nonce: Cj5VQN
.. section: Core and Builtins
For frozen stdlib modules, record the original module name as
``module.__spec__.loader_state.origname``.  If the value is different than
``module.__spec__.name`` then the module was defined as an alias in
Tools/scripts/freeze_modules.py.  If it is ``None`` then the module comes
from a source file outside the stdlib.
..
.. bpo: 45324
.. date: 2021-09-29-12-02-39
.. nonce: BTQElX
.. section: Core and Builtins
In FrozenImporter.find_spec(), we now preserve the information needed in
exec_module() to load the module.  This change mostly impacts internal
details, rather than changing the importer's behavior.
..
.. bpo: 45292
.. date: 2021-09-26-18-18-50
.. nonce: aX5HVr
.. section: Core and Builtins
Implement :pep:`654`. Add :class:`ExceptionGroup` and
:class:`BaseExceptionGroup`. Update traceback display code.
..
.. bpo: 40116
.. date: 2021-09-23-14-00-05
.. nonce: KaoeFs
.. section: Core and Builtins
Change to the implementation of split dictionaries. Classes where the
instances differ either in the exact set of attributes, or in the order in
which those attributes are set, can still share keys. This should have no
observable effect on users of Python or the C-API. Patch by Mark Shannon.
..
.. bpo: 44050
.. date: 2021-09-08-00-30-09
.. nonce: mFI15u
.. section: Core and Builtins
Extensions that indicate they use global state (by setting ``m_size`` to -1)
can again be used in multiple interpreters. This reverts to behavior of
Python 3.8.
..
.. bpo: 44525
.. date: 2021-06-28-22-23-59
.. nonce: sSvUKG
.. section: Core and Builtins
Setup initial specialization infrastructure for the ``CALL_FUNCTION``
opcode. Implemented initial specializations for C function calls:
* ``CALL_FUNCTION_BUILTIN_O`` for ``METH_O`` flag.
* ``CALL_FUNCTION_BUILTIN_FAST`` for ``METH_FASTCALL`` flag without keywords.
* ``CALL_FUNCTION_LEN`` for ``len(o)``.
* ``CALL_FUNCTION_ISINSTANCE`` for ``isinstance(o, t)``.
..
.. bpo: 44511
.. date: 2021-06-26-16-55-08
.. nonce: k8sMvV
.. section: Core and Builtins
Improve the generated bytecode for class and mapping patterns.
..
.. bpo: 43706
.. date: 2021-04-03-02-44-15
.. nonce: jjsXlT
.. section: Core and Builtins
Speed up calls to ``enumerate()`` by using the :pep:`590` ``vectorcall``
calling convention. Patch by Donghee Na.
..
.. bpo: 45679
.. date: 2021-10-30-21-11-37
.. nonce: Dq8Cpu
.. section: Library
Fix caching of multi-value :data:`typing.Literal`. ``Literal[True, 2]`` is
no longer equal to ``Literal[1, 2]``.
..
.. bpo: 42064
.. date: 2021-10-27-13-28-52
.. nonce: UK4jgV
.. section: Library
Convert :mod:`sqlite3` to multi-phase initialisation (PEP 489). Patches by
Erlend E. Aasland.
..
.. bpo: 45438
.. date: 2021-10-27-10-05-39
.. nonce: Xz5lGU
.. section: Library
Fix typing.Signature string representation for generic builtin types.
..
.. bpo: 45613
.. date: 2021-10-26-14-29-54
.. nonce: 55Ie3c
.. section: Library
:mod:`sqlite3` now sets :attr:`sqlite3.threadsafety` based on the default
threading mode the underlying SQLite library has been compiled with. Patch
by Erlend E. Aasland.
..
.. bpo: 45574
.. date: 2021-10-22-23-06-33
.. nonce: svqA84
.. section: Library
Fix warning about ``print_escape`` being unused.
..
.. bpo: 45581
.. date: 2021-10-22-21-57-02
.. nonce: rlH6ay
.. section: Library
:meth:`sqlite3.connect` now correctly raises :exc:`MemoryError` if the
underlying SQLite API signals memory error. Patch by Erlend E. Aasland.
..
.. bpo: 45557
.. date: 2021-10-21-16-18-51
.. nonce: 4MQt4r
.. section: Library
:func:`pprint.pprint` now handles *underscore_numbers* correctly.
Previously it was always setting it to ``False``.
..
.. bpo: 44019
.. date: 2021-10-21-10-14-22
.. nonce: Xk4Ncr
.. section: Library
Add :func:`operator.call` to ``operator.__all__``. Patch by Kreusada.
..
.. bpo: 42174
.. date: 2021-10-19-01-30-57
.. nonce: O2w9bi
.. section: Library
:meth:`shutil.get_terminal_size` now falls back to sane values if the column
or line count are 0.
..
.. bpo: 35673
.. date: 2021-10-18-18-12-47
.. nonce: KOkHWe
.. section: Library
Improve the introspectability of the ``__loader__`` attribute for namespace
packages.  :class:`importlib.machinery.NamespaceLoader` is now public, and
implements the :class:`importlib.abc.InspectLoader` interface.
``_NamespaceLoader`` is kept for backward compatibility.
..
.. bpo: 45515
.. date: 2021-10-18-14-52-48
.. nonce: aXdvm_
.. section: Library
Add references to :mod:`zoneinfo` in the :mod:`datetime` documentation,
mostly replacing outdated references to ``dateutil.tz``. Change by Paul
Ganssle.
..
.. bpo: 45475
.. date: 2021-10-18-10-46-47
.. nonce: sb9KDF
.. section: Library
Reverted optimization of iterating :class:`gzip.GzipFile`,
:class:`bz2.BZ2File`, and :class:`lzma.LZMAFile` (see bpo-43787) because it
caused regression when user iterate them without having reference of them.
Patch by Inada Naoki.
..
.. bpo: 45489
.. date: 2021-10-16-23-46-39
.. nonce: QB0rhG
.. section: Library
Update :class:`~typing.ForwardRef` to support ``|`` operator. Patch by
Donghee Na.
..
.. bpo: 42222
.. date: 2021-10-15-11-30-11
.. nonce: hdHyac
.. section: Library
Removed deprecated support for float arguments in *randrange()*.
..
.. bpo: 45428
.. date: 2021-10-14-18-04-17
.. nonce: mM2War
.. section: Library
Fix a regression in py_compile when reading filenames from standard input.
..
.. bpo: 45467
.. date: 2021-10-14-13-31-19
.. nonce: Q7Ma6A
.. section: Library
Fix incremental decoder and stream reader in the "raw-unicode-escape" codec.
Previously they failed if the escape sequence was split.
..
.. bpo: 45461
.. date: 2021-10-14-00-19-02
.. nonce: 4LB_tJ
.. section: Library
Fix incremental decoder and stream reader in the "unicode-escape" codec.
Previously they failed if the escape sequence was split.
..
.. bpo: 45239
.. date: 2021-10-13-17-52-48
.. nonce: 7li1_0
.. section: Library
Fixed :func:`email.utils.parsedate_tz` crashing with
:exc:`UnboundLocalError` on certain invalid input instead of returning
``None``. Patch by Ben Hoyt.
..
.. bpo: 45417
.. date: 2021-10-12-20-35-06
.. nonce: gQM-O7
.. section: Library
Fix quadratic behaviour in the enum module: Creation of enum classes with a
lot of entries was quadratic.
..
.. bpo: 45249
.. date: 2021-10-10-16-14-33
.. nonce: xqLliz
.. section: Library
Fix the behaviour of :func:`traceback.print_exc` when displaying the caret
when the ``end_offset`` in the exception is set to 0. Patch by Pablo Galindo
..
.. bpo: 45416
.. date: 2021-10-10-09-42-34
.. nonce: n35O0_
.. section: Library
Fix use of :class:`asyncio.Condition` with explicit :class:`asyncio.Lock`
objects, which was a regression due to removal of explicit loop arguments.
Patch by Joongi Kim.
..
.. bpo: 20028
.. date: 2021-10-10-00-25-36
.. nonce: bPx4Z8
.. section: Library
Empty escapechar/quotechar is not allowed when initializing
:class:`csv.Dialect`. Patch by Vajrasky Kok and Donghee Na.
..
.. bpo: 44904
.. date: 2021-10-09-18-42-27
.. nonce: RlW5h8
.. section: Library
Fix bug in the :mod:`doctest` module that caused it to fail if a docstring
included an example with a ``classmethod`` ``property``. Patch by Alex
Waygood.
..
.. bpo: 45406
.. date: 2021-10-08-19-24-48
.. nonce: Qh_Mz4
.. section: Library
Make :func:`inspect.getmodule` catch ``FileNotFoundError`` raised by
:func:`inspect.getabsfile`, and return ``None`` to indicate that the module
could not be determined.
..
.. bpo: 45411
.. date: 2021-10-08-11-29-29
.. nonce: 4jR--U
.. section: Library
Add extensions for files containing subtitles - .srt & .vtt - to the
mimetypes.py module.
..
.. bpo: 10716
.. date: 2021-10-08-04-11-55
.. nonce: QSRVK2
.. section: Library
Migrated pydoc to HTML5 (without changing the look of it). Side effect is to
update xmlrpc's ``ServerHTMLDoc`` which now uses the CSS too. cgitb now
relies less on pydoc (as it can't use the CSS file).
..
.. bpo: 27580
.. date: 2021-10-07-21-11-48
.. nonce: tGcBTH
.. section: Library
Add support of null characters in :mod:`csv`.
..
.. bpo: 45262
.. date: 2021-10-07-14-04-10
.. nonce: HqF71Z
.. section: Library
Prevent use-after-free in asyncio. Make sure the cached running loop holder
gets cleared on dealloc to prevent use-after-free in get_running_loop
..
.. bpo: 45386
.. date: 2021-10-07-00-05-05
.. nonce: q9ORpA
.. section: Library
Make :mod:`xmlrpc.client` more robust to C runtimes where the underlying C
``strftime`` function results in a ``ValueError`` when testing for year
formatting options.
..
.. bpo: 20028
.. date: 2021-10-03-21-14-37
.. nonce: zBA4RK
.. section: Library
Improve error message of :class:`csv.Dialect` when initializing. Patch by
Vajrasky Kok and Donghee Na.
..
.. bpo: 45343
.. date: 2021-10-01-23-07-02
.. nonce: ixmctD
.. section: Library
Update bundled pip to 21.2.4 and setuptools to 58.1.0
..
.. bpo: 45328
.. date: 2021-09-30-08-22-44
.. nonce: 8Z-Q0B
.. section: Library
Fixed :class:`http.client.HTTPConnection` to work properly in OSs that don't
support the ``TCP_NODELAY`` socket option.
..
.. bpo: 45243
.. date: 2021-09-20-01-25-09
.. nonce: 0pJf0U
.. section: Library
Add :meth:`~sqlite3.Connection.setlimit` and
:meth:`~sqlite3.Connection.getlimit` to :class:`sqlite3.Connection` for
setting and getting SQLite limits by connection basis. Patch by Erlend E.
Aasland.
..
.. bpo: 45320
.. date: 2021-09-15-10-21-10
.. nonce: 4qaf5x
.. section: Library
Removed from the :mod:`inspect` module:
* the ``getargspec`` function, deprecated since Python 3.0;
use :func:`inspect.signature` or :func:`inspect.getfullargspec` instead.
* the ``formatargspec`` function, deprecated since Python 3.5;
use the :func:`inspect.signature` function and :class:`Signature` object
directly.
* the undocumented ``Signature.from_builtin`` and ``Signature.from_function``
functions, deprecated since Python 3.5; use the
:meth:`Signature.from_callable() <inspect.Signature.from_callable>` method
instead.
Patch by Hugo van Kemenade.
..
.. bpo: 45192
.. date: 2021-09-14-15-52-47
.. nonce: DjA-BI
.. section: Library
Fix the ``tempfile._infer_return_type`` function so that the ``dir``
argument of the :mod:`tempfile` functions accepts an object implementing the
``os.PathLike`` protocol.
Patch by Kyungmin Lee.
..
.. bpo: 45160
.. date: 2021-09-11-14-47-05
.. nonce: VzMXbW
.. section: Library
When tracing a tkinter variable used by a ttk OptionMenu, callbacks are no
longer made twice.
..
.. bpo: 25625
.. date: 2021-09-10-12-53-28
.. nonce: SzcBCw
.. section: Library
Added non parallel-safe :func:`~contextlib.chdir` context manager to change
the current working directory and then restore it on exit. Simple wrapper
around :func:`~os.chdir`.
..
.. bpo: 24139
.. date: 2021-08-30-23-10-48
.. nonce: e38czf
.. section: Library
Add support for SQLite extended result codes in :exc:`sqlite3.Error`. Patch
by Erlend E. Aasland.
..
.. bpo: 24444
.. date: 2021-08-30-00-19-23
.. nonce: Ki4bgz
.. section: Library
Fixed an error raised in :mod:`argparse` help display when help for an
option is set to 1+ blank spaces or when *choices* arg is an empty
container.
..
.. bpo: 44547
.. date: 2021-08-20-10-52-40
.. nonce: eu0iJq
.. section: Library
Implement ``Fraction.__int__``, so that a :class:`fractions.Fraction`
instance ``f`` passes an ``isinstance(f, typing.SupportsInt)`` check.
..
.. bpo: 40321
.. date: 2021-07-22-21-25-56
.. nonce: gBlFmw
.. section: Library
Adds support for HTTP 308 redirects to :mod:`urllib`. See :rfc:`7538` for
details. Patch by Jochem Schulenklopper.
..
.. bpo: 41374
.. date: 2020-07-27-19-21-05
.. nonce: cd-kFL
.. section: Library
Ensure that ``socket.TCP_*`` constants are exposed on Cygwin 3.1.6 and
greater.
..
.. bpo: 35970
.. date: 2019-02-11-19-06-10
.. nonce: ZRvh51
.. section: Library
Add help flag to the base64 module's command line interface. Patch
contributed by Robert Kuska.
..
.. bpo: 45726
.. date: 2021-11-05-12-15-24
.. nonce: GwRr7e
.. section: Documentation
Improve documentation for :func:`functools.singledispatch` and
:class:`functools.singledispatchmethod`.
..
.. bpo: 45680
.. date: 2021-11-03-14-51-03
.. nonce: 9_NTFU
.. section: Documentation
Amend the docs on ``GenericAlias`` objects to clarify that non-container
classes can also implement ``__class_getitem__``. Patch contributed by Alex
Waygood.
..
.. bpo: 45618
.. date: 2021-10-31-20-35-06
.. nonce: RTcNXF
.. section: Documentation
Update Sphinx version used to build the documentation to 4.2.0. Patch by
Maciej Olko.
..
.. bpo: 45655
.. date: 2021-10-28-19-22-55
.. nonce: aPYGaS
.. section: Documentation
Add a new "relevant PEPs" section to the top of the documentation for the
``typing`` module. Patch by Alex Waygood.
..
.. bpo: 45604
.. date: 2021-10-26-10-00-45
.. nonce: Dm-YhV
.. section: Documentation
Add ``level`` argument to ``multiprocessing.log_to_stderr`` function docs.
..
.. bpo: 45516
.. date: 2021-10-22-21-57-42
.. nonce: 7_RMEX
.. section: Documentation
Add protocol description to the :class:`importlib.abc.TraversableResources`
documentation.
..
.. bpo: 45464
.. date: 2021-10-20-16-26-53
.. nonce: mOISBs
.. section: Documentation
Mention in the documentation of :ref:`Built-in Exceptions
<bltin-exceptions>` that inheriting from multiple exception types in a
single subclass is not recommended due to possible memory layout
incompatibility.
..
.. bpo: 45449
.. date: 2021-10-19-01-41-40
.. nonce: fjHZJc
.. section: Documentation
Add note about :pep:`585` in :mod:`collections.abc`.
..
.. bpo: 45516
.. date: 2021-10-18-20-12-18
.. nonce: EJh4K8
.. section: Documentation
Add protocol description to the :class:`importlib.abc.Traversable`
documentation.
..
.. bpo: 20692
.. date: 2021-10-13-00-42-54
.. nonce: K5rGtP
.. section: Documentation
Add Programming FAQ entry explaining that int literal attribute access
requires either a space after or parentheses around the literal.
..
.. bpo: 45678
.. date: 2021-11-04-20-03-32
.. nonce: 1xNMjN
.. section: Tests
Add tests for scenarios in which :class:`functools.singledispatchmethod` is
stacked on top of a method that has already been wrapped by two other
decorators. Patch by Alex Waygood.
..
.. bpo: 45578
.. date: 2021-10-30-19-00-25
.. nonce: bvu6X2
.. section: Tests
Add tests for :func:`dis.distb`
..
.. bpo: 45678
.. date: 2021-10-30-13-12-20
.. nonce: bKrYeS
.. section: Tests
Add tests to ensure that ``functools.singledispatchmethod`` correctly wraps
the attributes of the target function.
..
.. bpo: 45668
.. date: 2021-10-29-17-18-56
.. nonce: MfAw4i
.. section: Tests
PGO tests now pass when Python is built without test extension modules.
..
.. bpo: 45577
.. date: 2021-10-22-19-44-13
.. nonce: dSaNvK
.. section: Tests
Add subtests for all ``pickle`` protocols in ``test_zoneinfo``.
..
.. bpo: 45566
.. date: 2021-10-22-12-05-21
.. nonce: 2gQ3ZB
.. section: Tests
Fix ``test_frozen_pickle`` in ``test_dataclasses`` to check all ``pickle``
versions.
..
.. bpo: 43592
.. date: 2021-10-21-17-22-26
.. nonce: kHRsra
.. section: Tests
:mod:`test.libregrtest` now raises the soft resource limit for the maximum
number of file descriptors when the default is too low for our test suite as
was often the case on macOS.
..
.. bpo: 39679
.. date: 2021-10-18-16-18-41
.. nonce: F18qcE
.. section: Tests
Add more test cases for ``@functools.singledispatchmethod`` when combined with
``@classmethod`` or ``@staticmethod``.
..
.. bpo: 45410
.. date: 2021-10-08-14-03-20
.. nonce: Ex9xe2
.. section: Tests
When libregrtest spawns a worker process, stderr is now written into stdout
to keep messages order. Use a single pipe for stdout and stderr, rather than
two pipes. Previously, messages were out of order which made analysis of
buildbot logs harder Patch by Victor Stinner.
..
.. bpo: 45402
.. date: 2021-10-07-13-43-01
.. nonce: jlQvep
.. section: Tests
Fix test_tools.test_sundry() when Python is built out of tree: fix how the
freeze_modules.py tool locates the _freeze_module program. Patch by Victor
Stinner.
..
.. bpo: 45403
.. date: 2021-10-07-13-27-12
.. nonce: 7QiDvw
.. section: Tests
Fix test_sys.test_stdlib_dir() when Python is built outside the source tree:
compare normalized paths. Patch by Victor Stinner.
..
.. bpo: 45400
.. date: 2021-10-07-13-11-45
.. nonce: h3iT7V
.. section: Tests
Fix test_name_error_suggestions_do_not_trigger_for_too_many_locals() of
test_exceptions if a directory name contains "a1" (like "Python-3.11.0a1"):
use a stricter regular expression. Patch by Victor Stinner.
..
.. bpo: 10572
.. date: 2021-01-07-01-25-38
.. nonce: gEEZ9z
.. section: Tests
Rename :mod:`sqlite3` tests from ``test_sqlite`` to ``test_sqlite3``, and
relocate them to ``Lib/test/test_sqlite3``. Patch by Erlend E. Aasland.
..
.. bpo: 43158
.. date: 2021-11-01-12-51-46
.. nonce: fghS6w
.. section: Build
``setup.py`` now uses values from configure script to build the ``_uuid``
extension module. Configure now detects util-linux's ``libuuid``, too.
..
.. bpo: 45666
.. date: 2021-10-29-12-54-53
.. nonce: w2G63u
.. section: Build
Fix warning of ``swprintf`` and ``%s`` usage in ``_testembed.c``
..
.. bpo: 45548
.. date: 2021-10-28-14-47-22
.. nonce: mdCBxB
.. section: Build
``Modules/Setup`` and ``Modules/makesetup`` have been improved. The
``Setup`` file now contains working rules for all extensions. Outdated
comments have been removed. Rules defined by ``makesetup`` track
dependencies correctly.
..
.. bpo: 45548
.. date: 2021-10-24-21-49-49
.. nonce: UWx0UC
.. section: Build
The :mod:`math` and :mod:`cmath` implementation now require a C99 compatible
``libm`` and no longer ship with workarounds for missing acosh, asinh,
atanh, expm1, and log1p functions.
..
.. bpo: 45595
.. date: 2021-10-24-11-02-43
.. nonce: WI_5YU
.. section: Build
``setup.py`` and ``makesetup`` now track build dependencies on all Python
header files and module specific header files.
..
.. bpo: 45571
.. date: 2021-10-22-15-28-29
.. nonce: yY8NsJ
.. section: Build
``Modules/Setup`` now use ``PY_CFLAGS_NODIST`` instead of ``PY_CFLAGS`` to
compile shared modules.
..
.. bpo: 45570
.. date: 2021-10-22-14-45-40
.. nonce: 61gM2A
.. section: Build
:mod:`pyexpat` and :mod:`!_elementtree` no longer define obsolete macros
``HAVE_EXPAT_CONFIG_H`` and ``USE_PYEXPAT_CAPI``. ``XML_POOR_ENTROPY`` is
now defined in ``expat_config.h``.
..
.. bpo: 43974
.. date: 2021-10-22-14-00-44
.. nonce: HHZtbx
.. section: Build
``setup.py`` no longer defines ``Py_BUILD_CORE_MODULE``. Instead every
module, that uses the internal API, defines the macro.
..
.. bpo: 45548
.. date: 2021-10-20-17-02-56
.. nonce: BoggEf
.. section: Build
Fill in missing entries in Modules/Setup.
..
.. bpo: 45532
.. date: 2021-10-20-16-07-39
.. nonce: kyhvis
.. section: Build
Update :data:`sys.version` to use ``main`` as fallback information. Patch by
Jeong YunWon.
..
.. bpo: 45536
.. date: 2021-10-20-12-42-39
.. nonce: oQNYHB
.. section: Build
The ``configure`` script now checks whether OpenSSL headers and libraries
provide required APIs. Most common APIs are verified. The check detects
outdated or missing OpenSSL. Failures do not stop configure.
..
.. bpo: 45221
.. date: 2021-10-18-10-25-56
.. nonce: rnulhf
.. section: Build
Fixed regression in handling of ``LDFLAGS`` and ``CPPFLAGS`` options where
:meth:`argparse.parse_known_args` could interpret an option as one of the
built-in command line argument, for example ``-h`` for help.
..
.. bpo: 45440
.. date: 2021-10-12-02-13-08
.. nonce: -zYgDb
.. section: Build
Building Python now requires a C99 ``<math.h>`` header file providing the
following functions: ``copysign()``, ``hypot()``, ``isfinite()``,
``isinf()``, ``isnan()``, ``round()``. Patch by Victor Stinner.
..
.. bpo: 45405
.. date: 2021-10-11-16-27-38
.. nonce: iSfdW5
.. section: Build
Prevent ``internal configure error`` when running ``configure`` with recent
versions of non-Apple clang.  Patch by David Bohman.
..
.. bpo: 45433
.. date: 2021-10-11-16-08-37
.. nonce: pVDkMV
.. section: Build
Avoid linking libpython with libcrypt.
..
.. bpo: 43652
.. date: 2021-11-04-00-41-50
.. nonce: RnqV7I
.. section: Windows
Update Tcl/Tk to 8.6.11, actually this time. The previous update incorrectly
included 8.6.10.
..
.. bpo: 45337
.. date: 2021-09-30-23-17-27
.. nonce: qg7U_h
.. section: Windows
venv now warns when the created environment may need to be accessed at a
different path, due to redirections, links or junctions. It also now
correctly installs or upgrades components when the alternate path is
required.
..
.. bpo: 43851
.. date: 2021-04-15-01-23-10
.. nonce: qgU0gy
.. section: Windows
Build SQLite ``SQLITE_OMIT_AUTOINIT`` on Windows. Patch by Erlend E.
Aasland.
..
.. bpo: 44828
.. date: 2021-10-25-02-02-21
.. nonce: XBdXlJ
.. section: macOS
Avoid tkinter file dialog failure on macOS 12 Monterey when using the Tk
8.6.11 provided by python.org macOS installers. Patch by Marc Culler of the
Tk project.
..
.. bpo: 45495
.. date: 2021-10-16-17-20-32
.. nonce: ST8RFt
.. section: IDLE
Add context keywords 'case' and 'match' to completions list.
..
.. bpo: 29103
.. date: 2021-10-20-18-41-17
.. nonce: CMRLyq
.. section: C API
:c:func:`PyType_FromSpec* <PyType_FromModuleAndSpec>` now copies the class
name from the spec to a buffer owned by the class, so the original can be
safely deallocated. Patch by Petr Viktorin.
..
.. bpo: 45522
.. date: 2021-10-19-13-07-46
.. nonce: kGAwmZ
.. section: C API
The internal freelists for frame, float, list, dict, async generators, and
context objects can now be disabled.
..
.. bpo: 35134
.. date: 2021-10-19-00-20-40
.. nonce: Z0Zk_m
.. section: C API
Exclude :c:func:`!PyWeakref_GET_OBJECT` from the limited C API. It never
worked since the :c:type:`!PyWeakReference` structure is opaque in the
limited C API.
..
.. bpo: 35081
.. date: 2021-10-15-09-29-59
.. nonce: 2teFD3
.. section: C API
Move the ``interpreteridobject.h`` header file from ``Include/`` to
``Include/internal/``. It only provides private functions. Patch by Victor
Stinner.
..
.. bpo: 35134
.. date: 2021-10-15-00-11-51
.. nonce: eX4zqy
.. section: C API
The non-limited API files ``cellobject.h``, ``classobject.h``,
``context.h``, ``funcobject.h``, ``genobject.h`` and ``longintrepr.h`` have
been moved to the ``Include/cpython`` directory. Moreover, the ``eval.h``
header file was removed. These files must not be included directly, as they
are already included in ``Python.h``: :ref:`Include Files <api-includes>`.
If they have been included directly, consider including ``Python.h``
instead. Patch by Victor Stinner.
..
.. bpo: 45474
.. date: 2021-10-14-22-16-56
.. nonce: 1OkJQh
.. section: C API
The following items are no longer available when ``Py_LIMITED_API`` is
defined:
* :c:func:`PyMarshal_WriteLongToFile`
* :c:func:`PyMarshal_WriteObjectToFile`
* :c:func:`PyMarshal_ReadObjectFromString`
* :c:func:`PyMarshal_WriteObjectToString`
* the ``Py_MARSHAL_VERSION`` macro
These are not part of the :ref:`limited API <limited-api-list>`.
Patch by Victor Stinner.
..
.. bpo: 45434
.. date: 2021-10-13-14-42-46
.. nonce: INNEEt
.. section: C API
Remove the ``pystrhex.h`` header file. It only contains private functions. C
extensions should only include the main ``<Python.h>`` header file. Patch by
Victor Stinner.
..
.. bpo: 45440
.. date: 2021-10-12-02-13-41
.. nonce: Gf94rE
.. section: C API
Remove the ``Py_FORCE_DOUBLE()`` macro. It was used by the
``Py_IS_INFINITY()`` macro. Patch by Victor Stinner.
..
.. bpo: 45434
.. date: 2021-10-11-23-03-49
.. nonce: tsS8I_
.. section: C API
``<Python.h>`` no longer includes the header files ``<stdlib.h>``,
``<stdio.h>``, ``<errno.h>`` and ``<string.h>`` when the ``Py_LIMITED_API``
macro is set to ``0x030b0000`` (Python 3.11) or higher. C extensions should
explicitly include the header files after ``#include <Python.h>``. Patch by
Victor Stinner.
..
.. bpo: 41123
.. date: 2021-10-11-22-58-33
.. nonce: myrlIp
.. section: C API
Remove ``Py_UNICODE_COPY()`` and ``Py_UNICODE_FILL()`` macros, deprecated
since Python 3.3. Use ``PyUnicode_CopyCharacters()`` or ``memcpy()``
(``wchar_t*`` string), and ``PyUnicode_Fill()`` functions instead. Patch by
Victor Stinner.
..
.. bpo: 45412
.. date: 2021-10-08-15-54-07
.. nonce: KHyJCT
.. section: C API
Remove the following math macros using the ``errno`` variable:
* ``Py_ADJUST_ERANGE1()``
* ``Py_ADJUST_ERANGE2()``
* ``Py_OVERFLOWED()``
* ``Py_SET_ERANGE_IF_OVERFLOW()``
* ``Py_SET_ERRNO_ON_MATH_ERROR()``
Patch by Victor Stinner.
..
.. bpo: 45395
.. date: 2021-10-06-15-54-40
.. nonce: yVhdAl
.. section: C API
Custom frozen modules (the array set to ``PyImport_FrozenModules``) are now
treated as additions, rather than replacing all the default frozen modules.
Frozen stdlib modules can still be disabled by setting the "code" field of
the custom array entry to NULL.
..
.. bpo: 43760
.. date: 2021-09-24-11-12-21
.. nonce: Bfxd1-
.. section: C API
Add new :c:func:`PyThreadState_EnterTracing`, and
:c:func:`PyThreadState_LeaveTracing` functions to the limited C API to
suspend and resume tracing and profiling. Patch by Victor Stinner.
..
.. bpo: 44220
.. date: 2021-05-24-22-12-40
.. nonce: H9CUGl
.. section: C API
:c:var:`PyStructSequence_UnnamedField` is added to the Stable ABI.

.. date: 2023-01-06-02-02-11
.. gh-issue: 100776
.. nonce: pP8xux
.. release date: 2023-01-10
.. section: Core and Builtins
Fix misleading default value in :func:`input`'s ``__text_signature__``.
..
.. date: 2023-01-05-17-54-29
.. gh-issue: 99005
.. nonce: cmGwxv
.. section: Core and Builtins
Remove :opcode:`!UNARY_POSITIVE`, :opcode:`!ASYNC_GEN_WRAP` and
:opcode:`!LIST_TO_TUPLE`, replacing them with intrinsics.
..
.. date: 2023-01-05-13-54-00
.. gh-issue: 99005
.. nonce: D7H6j4
.. section: Core and Builtins
Add new :opcode:`CALL_INTRINSIC_1` instruction. Remove
:opcode:`IMPORT_STAR`, :opcode:`PRINT_EXPR` and
:opcode:`STOPITERATION_ERROR`, replacing them with the
:opcode:`CALL_INTRINSIC_1` instruction.
..
.. date: 2023-01-04-16-40-55
.. gh-issue: 100288
.. nonce: hRSRaT
.. section: Core and Builtins
Remove the LOAD_ATTR_METHOD_WITH_DICT specialized instruction. Stats show it
is not useful.
..
.. date: 2023-01-03-16-50-42
.. gh-issue: 100720
.. nonce: UhE7P-
.. section: Core and Builtins
Added ``_PyFrame_NumSlotsForCodeObject``, which returns the number of slots
needed in a frame for a given code object.
..
.. date: 2023-01-03-16-38-18
.. gh-issue: 100719
.. nonce: 2C--ko
.. section: Core and Builtins
Removed the co_nplaincellvars field from the code object, as it is
redundant.
..
.. date: 2023-01-01-15-59-48
.. gh-issue: 100637
.. nonce: M2n6Kg
.. section: Core and Builtins
Fix :func:`int.__sizeof__` calculation to include the 1-element ``ob_digit``
array for ``0`` and ``False``.
..
.. date: 2022-12-31-23-32-09
.. gh-issue: 100649
.. nonce: C0fY4S
.. section: Core and Builtins
Update the native_thread_id field of PyThreadState after fork.
..
.. date: 2022-12-29-04-39-38
.. gh-issue: 100126
.. nonce: pfFJd-
.. section: Core and Builtins
Fix an issue where "incomplete" frames could be briefly visible to C code
while other frames are being torn down, possibly resulting in corruption or
hard crashes of the interpreter while running finalizers.
..
.. date: 2022-12-28-15-02-53
.. gh-issue: 87447
.. nonce: 7-aekA
.. section: Core and Builtins
Fix :exc:`SyntaxError` on comprehension rebind checking with names that are
not actually redefined.
Now reassigning ``b`` in ``[(b := 1) for a, b.prop in some_iter]`` is
allowed. Reassigning ``a`` is still disallowed as per :pep:`572`.
..
.. date: 2022-12-22-21-56-08
.. gh-issue: 100268
.. nonce: xw_phB
.. section: Core and Builtins
Add :meth:`int.is_integer` to improve duck type compatibility between
:class:`int` and :class:`float`.
..
.. date: 2022-12-21-22-48-41
.. gh-issue: 100425
.. nonce: U64yLu
.. section: Core and Builtins
Improve the accuracy of ``sum()`` with compensated summation.
..
.. date: 2022-12-20-16-14-19
.. gh-issue: 100374
.. nonce: YRrVHT
.. section: Library
Fix incorrect result and delay in :func:`socket.getfqdn`. Patch by Dominic
Socular.
..
.. date: 2022-12-20-09-56-56
.. gh-issue: 100357
.. nonce: hPyTwY
.. section: Core and Builtins
Convert ``vars``, ``dir``, ``next``, ``getattr``, and ``iter`` to argument
clinic.
..
.. date: 2022-12-17-19-44-57
.. gh-issue: 100117
.. nonce: yRWQ1y
.. section: Core and Builtins
Improve the output of :meth:`codeobject.co_lines` by emitting only one entry
for each line range.
..
.. date: 2022-12-15-00-50-25
.. gh-issue: 90043
.. nonce: gyoKdx
.. section: Core and Builtins
Handle NaNs when specializing :opcode:`COMPARE_OP` for :class:`float`
values.
..
.. date: 2022-12-13-16-05-18
.. gh-issue: 100222
.. nonce: OVVvYe
.. section: Core and Builtins
Redefine the ``_Py_CODEUNIT`` typedef as a union to describe its layout to
the C compiler, avoiding type punning and improving clarity.
..
.. date: 2022-12-12-11-27-54
.. gh-issue: 99955
.. nonce: Ix5Rrg
.. section: Core and Builtins
Internal compiler functions (in compile.c) now consistently return -1 on
error and 0 on success.
..
.. date: 2022-12-12-05-30-12
.. gh-issue: 100188
.. nonce: sGCSMR
.. section: Core and Builtins
The ``BINARY_SUBSCR_LIST_INT`` and ``BINARY_SUBSCR_TUPLE_INT`` instructions
are no longer used for negative integers because those instructions always
miss when encountering negative integers.
..
.. date: 2022-12-12-01-05-16
.. gh-issue: 99110
.. nonce: 1JqtIg
.. section: Core and Builtins
Initialize frame->previous in frameobject.c to fix a segmentation fault when
accessing frames created by :c:func:`PyFrame_New`.
..
.. date: 2022-12-12-00-59-11
.. gh-issue: 94155
.. nonce: LWE9y_
.. section: Core and Builtins
Improved the hashing algorithm for code objects, mitigating some hash
collisions.
..
.. date: 2022-12-10-20-00-13
.. gh-issue: 99540
.. nonce: ZZZHeP
.. section: Core and Builtins
``None`` now hashes to a constant value. This is not a requirements change.
..
.. date: 2022-12-09-14-27-36
.. gh-issue: 100143
.. nonce: 5g9rb4
.. section: Core and Builtins
When built with ``--enable-pystats``, stats collection is now off by
default. To enable it early at startup, pass the ``-Xpystats`` flag.  Stats
are now always dumped, even if switched off.
..
.. date: 2022-12-09-13-18-42
.. gh-issue: 100146
.. nonce: xLVKg0
.. section: Core and Builtins
Improve ``BUILD_LIST`` opcode so that it works similarly to the
``BUILD_TUPLE`` opcode, by stealing references from the stack rather than
repeatedly using stack operations to set list elements.  Implementation
details are in a new private API :c:func:`!_PyList_FromArraySteal`.
..
.. date: 2022-12-08-12-26-34
.. gh-issue: 100110
.. nonce: ertac-
.. section: Core and Builtins
Specialize ``FOR_ITER`` for tuples.
..
.. date: 2022-12-06-22-24-01
.. gh-issue: 100050
.. nonce: lcrPqQ
.. section: Core and Builtins
Honor existing errors obtained when searching for mismatching parentheses in
the tokenizer. Patch by Pablo Galindo
..
.. date: 2022-12-04-00-38-33
.. gh-issue: 92216
.. nonce: CJXuWB
.. section: Core and Builtins
Improve the performance of :func:`hasattr` for type objects with a missing
attribute.
..
.. date: 2022-11-19-01-11-06
.. gh-issue: 99582
.. nonce: wvOBVy
.. section: Core and Builtins
Freeze :mod:`zipimport` module into ``_bootstrap_python``.
..
.. date: 2022-11-16-05-57-24
.. gh-issue: 99554
.. nonce: A_Ywd2
.. section: Core and Builtins
Pack debugging location tables more efficiently during bytecode compilation.
..
.. date: 2022-10-21-16-10-39
.. gh-issue: 98522
.. nonce: s_SixG
.. section: Core and Builtins
Add an internal version number to code objects, to give better versioning of
inner functions and comprehensions, and thus better specialization of those
functions. This change is invisible to both Python and C extensions.
..
.. date: 2022-07-06-18-44-00
.. gh-issue: 94603
.. nonce: Q_03xV
.. section: Core and Builtins
Improve performance of ``list.pop`` for small lists.
..
.. date: 2022-06-17-08-00-34
.. gh-issue: 89051
.. nonce: yP4Na0
.. section: Library
Add :const:`ssl.OP_LEGACY_SERVER_CONNECT`
..
.. bpo: 32782
.. date: 2018-02-06-23-21-13
.. nonce: EJVSfR
.. section: Core and Builtins
``ctypes`` arrays of length 0 now report a correct itemsize when a
``memoryview`` is constructed from them, rather than always giving a value
of 0.
..
.. date: 2023-01-08-12-10-17
.. gh-issue: 100833
.. nonce: f6cT7E
.. section: Library
Speed up :func:`math.fsum` by removing defensive ``volatile`` qualifiers.
..
.. date: 2023-01-07-15-13-47
.. gh-issue: 100805
.. nonce: 05rBz9
.. section: Library
Modify :func:`random.choice` implementation to once again work with NumPy
arrays.
..
.. date: 2023-01-06-22-36-27
.. gh-issue: 100813
.. nonce: mHRdQn
.. section: Library
Add :const:`socket.IP_PKTINFO` constant.
..
.. date: 2023-01-06-14-05-15
.. gh-issue: 100792
.. nonce: CEOJth
.. section: Library
Make :meth:`email.message.Message.__contains__` twice as fast.
..
.. date: 2023-01-05-23-04-15
.. gh-issue: 91851
.. nonce: AuCzU5
.. section: Library
Microoptimizations for :meth:`fractions.Fraction.__round__`,
:meth:`fractions.Fraction.__ceil__` and
:meth:`fractions.Fraction.__floor__`.
..
.. date: 2023-01-04-22-10-31
.. gh-issue: 90104
.. nonce: yZk5EX
.. section: Library
Avoid RecursionError on ``repr`` if a dataclass field definition has a
cyclic reference.
..
.. date: 2023-01-04-12-58-59
.. gh-issue: 100689
.. nonce: Ce0ITG
.. section: Library
Fix crash in :mod:`pyexpat` by statically allocating ``PyExpat_CAPI``
capsule.
..
.. date: 2023-01-04-09-53-38
.. gh-issue: 100740
.. nonce: -j5UjI
.. section: Library
Fix ``unittest.mock.Mock`` not respecting the spec for attribute names
prefixed with ``assert``.
..
.. date: 2023-01-03-11-06-28
.. gh-issue: 91219
.. nonce: s5IFCw
.. section: Library
Change ``SimpleHTTPRequestHandler`` to support subclassing to provide a
different set of index file names instead of using ``__init__`` parameters.
..
.. date: 2023-01-02-16-59-49
.. gh-issue: 100690
.. nonce: 2EgWPS
.. section: Library
``Mock`` objects which are not unsafe will now raise an ``AttributeError``
when accessing an attribute that matches the name of an assertion but
without the prefix ``assert_``, e.g. accessing ``called_once`` instead of
``assert_called_once``. This is in addition to this already happening for
accessing attributes with prefixes ``assert``, ``assret``, ``asert``,
``aseert``, and ``assrt``.
..
.. date: 2023-01-01-23-57-00
.. gh-issue: 89727
.. nonce: ojedHN
.. section: Library
Simplify and optimize :func:`os.walk` by using :func:`isinstance` checks to
check the top of the stack.
..
.. date: 2023-01-01-21-54-46
.. gh-issue: 100485
.. nonce: geNrHS
.. section: Library
Add math.sumprod() to compute the sum of products.
..
.. date: 2022-12-30-07-49-08
.. gh-issue: 86508
.. nonce: nGZDzC
.. section: Library
Fix :func:`asyncio.open_connection` to skip binding to local addresses of
different family. Patch by Kumar Aditya.
..
.. date: 2022-12-29-11-45-22
.. gh-issue: 97930
.. nonce: hrtmJe
.. section: Library
``importlib.resources.files`` now accepts a module as an anchor instead of
only accepting packages. If a module is passed, resources are resolved
adjacent to that module (in the same package or at the package root). The
parameter was renamed from ``package`` to ``anchor`` with a compatibility
shim for those passing by keyword. Additionally, the new ``anchor``
parameter is now optional and will default to the caller's module.
..
.. date: 2022-12-28-17-38-39
.. gh-issue: 100585
.. nonce: BiiTlG
.. section: Library
Fixed a bug where importlib.resources.as_file was leaving file pointers open
..
.. date: 2022-12-28-00-28-43
.. gh-issue: 100562
.. nonce: Hic0Z0
.. section: Library
Improve performance of :meth:`pathlib.Path.absolute` by nearly 2x. This
comes at the cost of a performance regression in :meth:`pathlib.Path.cwd`,
which is generally used less frequently in user code.
..
.. date: 2022-12-24-16-39-53
.. gh-issue: 100519
.. nonce: G_dZLP
.. section: Library
Small simplification of :func:`http.cookiejar.eff_request_host` that
improves readability and better matches the RFC wording.
..
.. date: 2022-12-24-08-42-05
.. gh-issue: 100287
.. nonce: n0oEuG
.. section: Library
Fix the interaction of :func:`unittest.mock.seal` with
:class:`unittest.mock.AsyncMock`.
..
.. date: 2022-12-24-04-13-54
.. gh-issue: 100488
.. nonce: Ut8HbE
.. section: Library
Add :meth:`Fraction.is_integer` to check whether a
:class:`fractions.Fraction` is an integer. This improves duck type
compatibility with :class:`float` and :class:`int`.
..
.. date: 2022-12-23-21-02-43
.. gh-issue: 100474
.. nonce: gppA4U
.. section: Library
:mod:`http.server` now checks that an index page is actually a regular file
before trying to serve it.  This avoids issues with directories named
``index.html``.
..
.. date: 2022-12-20-11-07-30
.. gh-issue: 100363
.. nonce: Wo_Beg
.. section: Library
Speed up :func:`asyncio.get_running_loop` by removing redundant ``getpid``
checks. Patch by Kumar Aditya.
..
.. date: 2022-12-19-20-54-04
.. gh-issue: 78878
.. nonce: JrkYqJ
.. section: Library
Fix crash when creating an instance of :class:`!_ctypes.CField`.
..
.. date: 2022-12-19-19-30-06
.. gh-issue: 100348
.. nonce: o7IAHh
.. section: Library
Fix ref cycle in :class:`!asyncio._SelectorSocketTransport` by removing
``_read_ready_cb`` in ``close``.
..
.. date: 2022-12-19-12-18-28
.. gh-issue: 100344
.. nonce: lfCqpE
.. section: Library
Provide C implementation for :func:`asyncio.current_task` for a 4x-6x
speedup.
..
.. date: 2022-12-15-18-28-13
.. gh-issue: 100272
.. nonce: D1O9Ey
.. section: Library
Fix JSON serialization of OrderedDict.  It now preserves the order of keys.
..
.. date: 2022-12-14-17-37-01
.. gh-issue: 83076
.. nonce: NaYzWT
.. section: Library
Instantiation of ``Mock()`` and ``AsyncMock()`` is now 3.8x faster.
..
.. date: 2022-12-14-11-45-38
.. gh-issue: 100234
.. nonce: kn6yWV
.. section: Library
Set a default value of 1.0 for the ``lambd`` parameter in
random.expovariate().
..
.. date: 2022-12-13-17-29-09
.. gh-issue: 100228
.. nonce: bgtzMV
.. section: Library
A :exc:`DeprecationWarning` may be raised when :func:`os.fork` or
:func:`os.forkpty` is called from multi-threaded processes.  Forking with
threads is unsafe and can cause deadlocks, crashes and subtle problems. Lack
of a warning does not indicate that the fork call was actually safe, as
Python may not be aware of all threads.
..
.. date: 2022-12-10-20-52-28
.. gh-issue: 100039
.. nonce: zDqjT4
.. section: Library
Improve signatures for enums and flags.
..
.. date: 2022-12-10-08-36-07
.. gh-issue: 100133
.. nonce: g-zQlp
.. section: Library
Fix regression in :mod:`asyncio` where a subprocess would sometimes lose
data received from pipe.
..
.. bpo: 44592
.. date: 2022-12-09-10-35-36
.. nonce: z-P3oe
.. section: Library
Fixes inconsistent handling of case sensitivity of *extrasaction* arg in
:class:`csv.DictWriter`.
..
.. date: 2022-12-08-06-18-06
.. gh-issue: 100098
.. nonce: uBvPlp
.. section: Library
Fix ``tuple`` subclasses being cast to ``tuple`` when used as enum values.
..
.. date: 2022-12-04-16-12-04
.. gh-issue: 85432
.. nonce: l_ehmI
.. section: Library
Rename the *fmt* parameter of the pure-Python implementation of
:meth:`datetime.time.strftime` to *format*. Rename the *t* parameter of
:meth:`datetime.datetime.fromtimestamp` to *timestamp*. These changes mean
the parameter names in the pure-Python implementation now match the
parameter names in the C implementation. Patch by Alex Waygood.
..
.. date: 2022-12-03-20-06-16
.. gh-issue: 98778
.. nonce: t5U9uc
.. section: Library
Update :exc:`~urllib.error.HTTPError` to be initialized properly, even if
the ``fp`` is ``None``. Patch by Donghee Na.
..
.. date: 2022-12-01-15-44-58
.. gh-issue: 99925
.. nonce: x4y6pF
.. section: Library
Unify error messages in JSON serialization between
``json.dumps(float('nan'), allow_nan=False)`` and ``json.dumps(float('nan'),
allow_nan=False, indent=<SOMETHING>)``. Now both include the representation
of the value that could not be serialized.
..
.. date: 2022-11-29-20-44-54
.. gh-issue: 89727
.. nonce: UJZjkk
.. section: Library
Fix issue with :func:`os.walk` where a :exc:`RecursionError` would occur on
deep directory structures by adjusting the implementation of :func:`os.walk`
to be iterative instead of recursive.
..
.. date: 2022-11-23-23-58-45
.. gh-issue: 94943
.. nonce: Oog0Zo
.. section: Library
Add :ref:`enum-dataclass-support` to the :class:`~enum.Enum`
:meth:`~enum.Enum.__repr__`. When inheriting from a
:class:`~dataclasses.dataclass`, only show the field names in the value
section of the member :func:`repr`, and not the dataclass' class name.
..
.. date: 2022-11-21-16-24-01
.. gh-issue: 83035
.. nonce: qZIujU
.. section: Library
Fix :func:`inspect.getsource` handling of decorator calls with nested
parentheses.
..
.. date: 2022-11-20-11-59-54
.. gh-issue: 99576
.. nonce: ZD7jU6
.. section: Library
Fix ``.save()`` method for ``LWPCookieJar`` and ``MozillaCookieJar``: saved
file was not truncated on repeated save.
..
.. date: 2022-11-17-10-02-18
.. gh-issue: 94912
.. nonce: G2aa-E
.. section: Library
Add :func:`inspect.markcoroutinefunction` decorator which manually marks a
function as a coroutine for the benefit of :func:`iscoroutinefunction`.
..
.. date: 2022-11-15-18-45-01
.. gh-issue: 99509
.. nonce: FLK0xU
.. section: Library
Add :pep:`585` support for :class:`multiprocessing.queues.Queue`.
..
.. date: 2022-11-14-19-58-36
.. gh-issue: 99482
.. nonce: XmZyUr
.. section: Library
Remove ``Jython`` partial compatibility code from several stdlib modules.
..
.. date: 2022-11-13-15-32-19
.. gh-issue: 99433
.. nonce: Ys6y0A
.. section: Library
Fix :mod:`doctest` failure on :class:`types.MethodWrapperType` in modules.
..
.. date: 2022-10-28-07-24-34
.. gh-issue: 85267
.. nonce: xUy_Wm
.. section: Library
Several improvements to :func:`inspect.signature`'s handling of
``__text_signature``. - Fixes a case where :func:`inspect.signature` dropped
parameters - Fixes a case where :func:`inspect.signature` raised
:exc:`tokenize.TokenError` - Allows :func:`inspect.signature` to understand
defaults involving binary operations of constants -
:func:`inspect.signature` is documented as only raising :exc:`TypeError` or
:exc:`ValueError`, but sometimes raised :exc:`RuntimeError`. These cases now
raise :exc:`ValueError` - Removed a dead code path
..
.. date: 2022-10-24-07-31-11
.. gh-issue: 91166
.. nonce: -IG06R
.. section: Library
:mod:`asyncio` is optimized to avoid excessive copying when writing to
socket and use :meth:`~socket.socket.sendmsg` if the platform supports it.
Patch by Kumar Aditya.
..
.. date: 2022-10-07-18-16-00
.. gh-issue: 98030
.. nonce: 2oQCZy
.. section: Library
Add missing TCP socket options from Linux: ``TCP_MD5SIG``,
``TCP_THIN_LINEAR_TIMEOUTS``, ``TCP_THIN_DUPACK``, ``TCP_REPAIR``,
``TCP_REPAIR_QUEUE``, ``TCP_QUEUE_SEQ``, ``TCP_REPAIR_OPTIONS``,
``TCP_TIMESTAMP``, ``TCP_CC_INFO``, ``TCP_SAVE_SYN``, ``TCP_SAVED_SYN``,
``TCP_REPAIR_WINDOW``, ``TCP_FASTOPEN_CONNECT``, ``TCP_ULP``,
``TCP_MD5SIG_EXT``, ``TCP_FASTOPEN_KEY``, ``TCP_FASTOPEN_NO_COOKIE``,
``TCP_ZEROCOPY_RECEIVE``, ``TCP_INQ``, ``TCP_TX_DELAY``.
..
.. date: 2022-09-16-08-21-46
.. gh-issue: 88500
.. nonce: jQ0pCc
.. section: Library
Reduced the memory usage of :func:`urllib.parse.unquote` and
:func:`urllib.parse.unquote_to_bytes` on large values.
..
.. date: 2022-08-27-10-35-50
.. gh-issue: 96127
.. nonce: 8RdLre
.. section: Library
``inspect.signature`` was raising ``TypeError`` on call with mock objects.
Now it correctly returns ``(*args, **kwargs)`` as inferred signature.
..
.. date: 2022-08-11-10-02-19
.. gh-issue: 95882
.. nonce: FsUr72
.. section: Library
Fix a 3.11 regression in :func:`~contextlib.asynccontextmanager`, which
caused it to propagate exceptions with incorrect tracebacks and fix a 3.11
regression in  :func:`~contextlib.contextmanager`, which caused it to
propagate exceptions with incorrect tracebacks for :exc:`StopIteration`.
..
.. date: 2022-07-01-00-01-22
.. gh-issue: 78707
.. nonce: fHGSuM
.. section: Library
Deprecate passing more than one positional argument to
:meth:`pathlib.PurePath.relative_to` and
:meth:`~pathlib.PurePath.is_relative_to`.
..
.. date: 2022-05-06-01-53-34
.. gh-issue: 92122
.. nonce: 96Lf2p
.. section: Library
Fix reStructuredText syntax errors in docstrings in the :mod:`enum` module.
..
.. date: 2022-04-23-08-12-14
.. gh-issue: 91851
.. nonce: Jd47V6
.. section: Library
Optimize the :class:`~fractions.Fraction` arithmetics for small components.
..
.. bpo: 24132
.. date: 2022-03-05-02-14-09
.. nonce: W6iORO
.. section: Library
Make :class:`pathlib.PurePath` and :class:`~pathlib.Path` subclassable
(private to start). Previously, attempting to instantiate a subclass
resulted in an :exc:`AttributeError` being raised. Patch by Barney Gale.
..
.. bpo: 40447
.. date: 2020-05-03-12-55-55
.. nonce: oKR0Lj
.. section: Library
Accept :class:`os.PathLike` (such as :class:`pathlib.Path`) in the
``stripdir`` arguments of :meth:`compileall.compile_file` and
:meth:`compileall.compile_dir`.
..
.. bpo: 36880
.. date: 2019-05-13-11-37-30
.. nonce: ZgBgH0
.. section: Library
Fix a reference counting issue when a :mod:`ctypes` callback with return
type :class:`~ctypes.py_object` returns ``None``, which could cause crashes.
..
.. date: 2022-12-30-00-42-23
.. gh-issue: 100616
.. nonce: eu80ij
.. section: Documentation
Document existing ``attr`` parameter to :func:`curses.window.vline` function
in :mod:`curses`.
..
.. date: 2022-12-23-21-42-26
.. gh-issue: 100472
.. nonce: NNixfO
.. section: Documentation
Remove claim in documentation that the ``stripdir``, ``prependdir`` and
``limit_sl_dest`` parameters of :func:`compileall.compile_dir` and
:func:`compileall.compile_file` could be :class:`bytes`.
..
.. bpo: 25377
.. date: 2020-06-17-14-47-48
.. nonce: CTxC6o
.. section: Documentation
Clarify use of octal format of mode argument in help(os.chmod) as well as
help(os.fchmod)
..
.. date: 2022-12-23-13-29-55
.. gh-issue: 100454
.. nonce: 3no0cW
.. section: Tests
Start running SSL tests with OpenSSL 3.1.0-beta1.
..
.. date: 2022-12-08-00-03-37
.. gh-issue: 100086
.. nonce: 1zYpto
.. section: Tests
The Python test runner (libregrtest) now logs Python build information like
"debug" vs "release" build, or LTO and PGO optimizations. Patch by Victor
Stinner.
..
.. date: 2022-06-16-13-26-31
.. gh-issue: 93018
.. nonce: wvNx76
.. section: Tests
Make two tests forgiving towards host system libexpat with backported
security fixes applied.
..
.. date: 2022-12-26-15-07-48
.. gh-issue: 100540
.. nonce: l6ToSY
.. section: Build
Removed the ``--with-system-ffi`` ``configure`` option; ``libffi`` must now
always be supplied by the system on all non-Windows platforms.  The option
has had no effect on non-Darwin platforms for several releases, and in 3.11
only had the non-obvious effect of invoking ``pkg-config`` to find
``libffi`` and never setting ``-DUSING_APPLE_OS_LIBFFI``.  Now on Darwin
platforms ``configure`` will first check for the OS ``libffi`` and then fall
back to the same processing as other platforms if it is not found.
..
.. date: 2022-12-08-14-00-04
.. gh-issue: 88267
.. nonce: MqtRbm
.. section: Build
Avoid exporting Python symbols in linked Windows applications when the core
is built as static.
..
.. bpo: 41916
.. date: 2022-03-04-10-47-23
.. nonce: 1d2GLU
.. section: Build
Allow override of ac_cv_cxx_thread so that cross compiled python can set
-pthread for CXX.
..
.. date: 2023-01-09-23-03-57
.. gh-issue: 100180
.. nonce: b5phrg
.. section: Windows
Update Windows installer to OpenSSL 1.1.1s
..
.. date: 2022-12-20-18-36-17
.. gh-issue: 99191
.. nonce: 0cfRja
.. section: Windows
Use ``_MSVC_LANG >= 202002L`` instead of less-precise ``_MSC_VER >=1929`` to
more accurately test for C++20 support in :file:`PC/_wmimodule.cpp`.
..
.. date: 2022-12-09-22-47-42
.. gh-issue: 79218
.. nonce: Yiot2e
.. section: Windows
Define ``MS_WIN64`` for Mingw-w64 64bit, fix cython compilation failure.
..
.. date: 2022-12-06-11-16-46
.. gh-issue: 99941
.. nonce: GmUQ6o
.. section: Windows
Ensure that :func:`asyncio.Protocol.data_received` receives an immutable
:class:`bytes` object (as documented), instead of :class:`bytearray`.
..
.. bpo: 43984
.. date: 2021-05-02-15-29-33
.. nonce: U92jiv
.. section: Windows
:meth:`winreg.SetValueEx` now leaves the target value untouched in the case
of conversion errors. Previously, ``-1`` would be written in case of such
errors.
..
.. bpo: 34816
.. date: 2021-04-08-00-36-37
.. nonce: 4Xe0id
.. section: Windows
``hasattr(ctypes.windll, 'nonexistant')`` now returns ``False`` instead of
raising :exc:`OSError`.
..
.. date: 2023-01-09-22-04-21
.. gh-issue: 100180
.. nonce: WVhCny
.. section: macOS
Update macOS installer to OpenSSL 1.1.1s
..
.. date: 2022-12-26-14-52-37
.. gh-issue: 100540
.. nonce: kYZLtX
.. section: macOS
Removed obsolete ``dlfcn.h`` shim from the ``_ctypes`` extension module,
which has not been necessary since Mac OS X 10.2.
..
.. bpo: 45256
.. date: 2022-12-29-19-22-11
.. nonce: a0ee_H
.. section: Tools/Demos
Fix a bug that caused an :exc:`AttributeError` to be raised in
``python-gdb.py`` when ``py-locals`` is used without a frame.
..
.. date: 2022-12-19-10-08-53
.. gh-issue: 100342
.. nonce: qDFlQG
.. section: Tools/Demos
Add missing ``NULL`` check for possible allocation failure in ``*args``
parsing in Argument Clinic.
..
.. date: 2022-12-02-09-31-19
.. gh-issue: 99947
.. nonce: Ski7OC
.. section: C API
Raising SystemError on import will now have its cause be set to the original
unexpected exception.
..
.. date: 2022-11-30-16-39-22
.. gh-issue: 99240
.. nonce: 67nAX-
.. section: C API
In argument parsing, after deallocating newly allocated memory, reset its
pointer to NULL.
..
.. date: 2022-11-04-16-13-35
.. gh-issue: 98724
.. nonce: p0urWO
.. section: C API
The :c:macro:`Py_CLEAR`, :c:macro:`Py_SETREF` and :c:macro:`Py_XSETREF`
macros now only evaluate their arguments once. If an argument has side
effects, these side effects are no longer duplicated. Patch by Victor
Stinner.

.. bpo: 32176
.. date: 2017-12-02-21-37-22
.. nonce: Wt25-N
.. release date: 2017-12-05
.. section: Core and Builtins
co_flags.CO_NOFREE is now always set correctly by the code object
constructor based on freevars and cellvars, rather than needing to be set
correctly by the caller. This ensures it will be cleared automatically when
additional cell references are injected into a modified code object and
function.
..
.. bpo: 10544
.. date: 2017-11-27-08-37-34
.. nonce: 07nioT
.. section: Core and Builtins
Yield expressions are now deprecated in comprehensions and generator
expressions. They are still permitted in the definition of the outermost
iterable, as that is evaluated directly in the enclosing scope.
..
.. bpo: 32137
.. date: 2017-11-26-14-36-30
.. nonce: Stj5nL
.. section: Core and Builtins
The repr of deeply nested dict now raises a RecursionError instead of
crashing due to a stack overflow.
..
.. bpo: 32096
.. date: 2017-11-24-01-13-58
.. nonce: CQTHXJ
.. section: Core and Builtins
Revert memory allocator changes in the C API: move structures back from
_PyRuntime to Objects/obmalloc.c. The memory allocators are once again
initialized statically, and so PyMem_RawMalloc() and Py_DecodeLocale() can
be called before _PyRuntime_Initialize().
..
.. bpo: 32043
.. date: 2017-11-16-03-44-08
.. nonce: AAzwpZ
.. section: Core and Builtins
Add a new "developer mode": new "-X dev" command line option to enable debug
checks at runtime.
..
.. bpo: 32023
.. date: 2017-11-15-10-49-35
.. nonce: XnCGT5
.. section: Core and Builtins
SyntaxError is now correctly raised when a generator expression without
parenthesis is used instead of an inheritance list in a class definition.
The duplication of the parentheses can be omitted only on calls.
..
.. bpo: 32012
.. date: 2017-11-13-00-37-11
.. nonce: Kprjqe
.. section: Core and Builtins
SyntaxError is now correctly raised when a generator expression without
parenthesis is passed as an argument, but followed by a trailing comma. A
generator expression always needs to be directly inside a set of parentheses
and cannot have a comma on either side.
..
.. bpo: 28180
.. date: 2017-11-12-11-44-22
.. nonce: HQX000
.. section: Core and Builtins
A new internal ``_Py_SetLocaleFromEnv(category)`` helper function has been
added in order to improve the consistency of behaviour across different
``libc`` implementations (e.g. Android doesn't support setting the locale
from the environment by default).
..
.. bpo: 31949
.. date: 2017-11-05-16-11-07
.. nonce: 2yNC_z
.. section: Core and Builtins
Fixed several issues in printing tracebacks (PyTraceBack_Print()).
Setting sys.tracebacklimit to 0 or less now suppresses printing tracebacks.
Setting sys.tracebacklimit to None now causes using the default limit.
Setting sys.tracebacklimit to an integer larger than LONG_MAX now means using
the limit LONG_MAX rather than the default limit.
Fixed integer overflows in the case of more than ``2**31`` traceback items on
Windows.
Fixed output errors handling.
..
.. bpo: 30696
.. date: 2017-10-28-22-06-03
.. nonce: lhC3HE
.. section: Core and Builtins
Fix the interactive interpreter looping endlessly when no memory.
..
.. bpo: 20047
.. date: 2017-10-28-19-11-05
.. nonce: GuNAto
.. section: Core and Builtins
Bytearray methods partition() and rpartition() now accept only bytes-like
objects as separator, as documented.  In particular they now raise TypeError
rather of returning a bogus result when an integer is passed as a separator.
..
.. bpo: 21720
.. date: 2017-10-25-15-51-37
.. nonce: BwIKLP
.. section: Core and Builtins
BytesWarning no longer emitted when the *fromlist* argument of
``__import__()`` or the ``__all__`` attribute of the module contain bytes
instances.
..
.. bpo: 31845
.. date: 2017-10-24-21-27-32
.. nonce: 8OS-k3
.. section: Core and Builtins
Environment variables are once more read correctly at interpreter startup.
..
.. bpo: 28936
.. date: 2017-10-23-23-39-26
.. nonce: C288Jh
.. section: Core and Builtins
Ensure that lexically first syntax error involving a parameter and
``global`` or ``nonlocal`` is detected first at a given scope. Patch by Ivan
Levkivskyi.
..
.. bpo: 31825
.. date: 2017-10-20-14-07-46
.. nonce: gJvmGW
.. section: Core and Builtins
Fixed OverflowError in the 'unicode-escape' codec and in
codecs.escape_decode() when decode an escaped non-ascii byte.
..
.. bpo: 31618
.. date: 2017-10-18-19-41-12
.. nonce: liLDiS
.. section: Core and Builtins
The per-frame tracing logic added in 3.7a1 has been altered so that
``frame->f_lineno`` is updated before either ``"line"`` or ``"opcode"``
events are emitted. Previously, opcode events were emitted first, and
therefore would occasionally see stale line numbers on the frame. The
behavior of this feature has changed slightly as a result: when both
``f_trace_lines`` and ``f_trace_opcodes`` are enabled, line events now occur
first.
..
.. bpo: 28603
.. date: 2017-10-17-13-29-19
.. nonce: _-oia3
.. section: Core and Builtins
Print the full context/cause chain of exceptions on interpreter exit, even
if an exception in the chain is unhashable or compares equal to later ones.
Patch by Zane Bitter.
..
.. bpo: 31786
.. date: 2017-10-15-23-44-57
.. nonce: XwdEP4
.. section: Core and Builtins
Fix timeout rounding in the select module to round correctly negative
timeouts between -1.0 and 0.0. The functions now block waiting for events as
expected. Previously, the call was incorrectly non-blocking. Patch by Pablo
Galindo.
..
.. bpo: 31781
.. date: 2017-10-13-20-01-47
.. nonce: cXE9SM
.. section: Core and Builtins
Prevent crashes when calling methods of an uninitialized
``zipimport.zipimporter`` object. Patch by Oren Milman.
..
.. bpo: 30399
.. date: 2017-10-12-22-21-01
.. nonce: 45f1gv
.. section: Core and Builtins
Standard repr() of BaseException with a single argument no longer contains
redundant trailing comma.
..
.. bpo: 31626
.. date: 2017-10-01-15-48-03
.. nonce: reLPxY
.. section: Core and Builtins
Fixed a bug in debug memory allocator.  There was a write to freed memory
after shrinking a memory block.
..
.. bpo: 30817
.. date: 2017-07-01-15-11-13
.. nonce: j7ZvN_
.. section: Core and Builtins
``PyErr_PrintEx()`` clears now the ignored exception that may be raised by
``_PySys_SetObjectId()``, for example when no memory.
..
.. bpo: 28556
.. date: 2017-12-05-02-03-07
.. nonce: 9Z_PsJ
.. section: Library
Two minor fixes for ``typing`` module: allow shallow copying instances of
generic classes, improve interaction of ``__init_subclass__`` with generics.
Original PRs by Ivan Levkivskyi.
..
.. bpo: 32214
.. date: 2017-12-04-15-51-57
.. nonce: uozdNj
.. section: Library
PEP 557, Data Classes. Provides a decorator which adds boilerplate methods
to classes which use type annotations so specify fields.
..
.. bpo: 27240
.. date: 2017-12-02-16-06-00
.. nonce: Kji34M
.. section: Library
The header folding algorithm for the new email policies has been rewritten,
which also fixes bpo-30788, bpo-31831, and bpo-32182.  In particular,
RFC2231 folding is now done correctly.
..
.. bpo: 32186
.. date: 2017-11-30-20-38-16
.. nonce: O42bVe
.. section: Library
io.FileIO.readall() and io.FileIO.read() now release the GIL when getting
the file size. Fixed hang of all threads with inaccessible NFS server. Patch
by Nir Soffer.
..
.. bpo: 32101
.. date: 2017-11-29-00-42-47
.. nonce: -axD5l
.. section: Library
Add :attr:`sys.flags.dev_mode` flag
..
.. bpo: 32154
.. date: 2017-11-28-15-27-10
.. nonce: kDox7L
.. section: Library
The ``asyncio.windows_utils.socketpair()`` function has been removed: use
directly :func:`socket.socketpair` which is available on all platforms since
Python 3.5 (before, it wasn't available on Windows).
``asyncio.windows_utils.socketpair()`` was just an alias to
``socket.socketpair`` on Python 3.5 and newer.
..
.. bpo: 32089
.. date: 2017-11-27-11-29-34
.. nonce: 6ydDYv
.. section: Library
warnings: In development (-X dev) and debug mode (pydebug build), use the
"default" action for ResourceWarning, rather than the "always" action, in
the default warnings filters.
..
.. bpo: 32107
.. date: 2017-11-26-18-48-17
.. nonce: h2ph2K
.. section: Library
``uuid.getnode()`` now preferentially returns universally administered MAC
addresses if available, over locally administered MAC addresses.  This makes
a better guarantee for global uniqueness of UUIDs returned from
``uuid.uuid1()``.  If only locally administered MAC addresses are available,
the first such one found is returned.
..
.. bpo: 23033
.. date: 2017-11-26-17-00-52
.. nonce: YGXRWT
.. section: Library
Wildcard is now supported in hostname when it is one and only character in
the left most segment of hostname in second argument of
:meth:`ssl.match_hostname`.  Patch by Mandeep Singh.
..
.. bpo: 12239
.. date: 2017-11-24-14-07-55
.. nonce: Nj3A0x
.. section: Library
Make :meth:`!msilib.SummaryInformation.GetProperty` return ``None`` when the
value of property is ``VT_EMPTY``.  Initial patch by Mark Mc Mahon.
..
.. bpo: 28334
.. date: 2017-11-24-11-50-41
.. nonce: 3gGGlt
.. section: Library
Use :func:`os.path.expanduser` to find the ``~/.netrc`` file in
:class:`netrc.netrc`.  If it does not exist, :exc:`FileNotFoundError` is
raised.  Patch by Dimitri Merejkowsky.
..
.. bpo: 32121
.. date: 2017-11-24-00-59-12
.. nonce: ePbmwC
.. section: Library
Made ``tracemalloc.Traceback`` behave more like the traceback module,
sorting the frames from oldest to most recent. ``Traceback.format()`` now
accepts negative *limit*, truncating the result to the ``abs(limit)`` oldest
frames. To get the old behaviour, one can use the new *most_recent_first*
argument to ``Traceback.format()``. (Patch by Jesse Bakker.)
..
.. bpo: 31325
.. date: 2017-11-23-22-12-11
.. nonce: 8jAUxN
.. section: Library
Fix wrong usage of :func:`collections.namedtuple` in the
:meth:`RobotFileParser.parse() <urllib.robotparser.RobotFileParser.parse>`
method.
Initial patch by Robin Wellner.
..
.. bpo: 12382
.. date: 2017-11-23-21-47-36
.. nonce: xWT9k0
.. section: Library
:func:`!msilib.OpenDatabase` now raises a better exception message when it
couldn't open or create an MSI file.  Initial patch by William Tisäter.
..
.. bpo: 19610
.. date: 2017-11-23-16-15-55
.. nonce: Dlca2P
.. section: Library
``setup()`` now warns about invalid types for some fields.
The ``distutils.dist.Distribution`` class now warns when ``classifiers``,
``keywords`` and ``platforms`` fields are not specified as a list or a
string.
..
.. bpo: 32071
.. date: 2017-11-22-19-52-17
.. nonce: 4WNhUH
.. section: Library
Added the ``-k`` command-line option to ``python -m unittest`` to run only
tests that match the given pattern(s).
..
.. bpo: 10049
.. date: 2017-11-22-17-21-01
.. nonce: ttsBqb
.. section: Library
Added *nullcontext* no-op context manager to contextlib. This provides a
simpler and faster alternative to ExitStack() when handling optional context
managers.
..
.. bpo: 28684
.. date: 2017-11-22-12-54-46
.. nonce: NLiDKZ
.. section: Library
The new test.support.skip_unless_bind_unix_socket() decorator is used here
to skip asyncio tests that fail because the platform lacks a functional
bind() function for unix domain sockets (as it is the case for non root
users on the recent Android versions that run now SELinux in enforcing
mode).
..
.. bpo: 32110
.. date: 2017-11-22-09-44-15
.. nonce: VJa9bo
.. section: Library
``codecs.StreamReader.read(n)`` now returns not more than *n*
characters/bytes for non-negative *n*. This makes it compatible with
``read()`` methods of other file-like objects.
..
.. bpo: 27535
.. date: 2017-11-21-16-05-35
.. nonce: JLhcNz
.. section: Library
The warnings module doesn't leak memory anymore in the hidden warnings
registry for the "ignore" action of warnings filters. warn_explicit()
function doesn't add the warning key to the registry anymore for the
"ignore" action.
..
.. bpo: 32088
.. date: 2017-11-20-15-28-31
.. nonce: mV-4Nu
.. section: Library
warnings:  When Python is build is debug mode (``Py_DEBUG``),
:exc:`DeprecationWarning`, :exc:`PendingDeprecationWarning` and
:exc:`ImportWarning` warnings are now displayed by default.
..
.. bpo: 1647489
.. date: 2017-11-20-01-29-46
.. nonce: -ZNNkh
.. section: Library
Fixed searching regular expression patterns that could match an empty
string. Non-empty string can now be correctly found after matching an empty
string.
..
.. bpo: 25054
.. date: 2017-11-20-01-01-01
.. nonce: rOlRV6
.. section: Library
Added support of splitting on a pattern that could match an empty string.
..
.. bpo: 32072
.. date: 2017-11-18-21-13-52
.. nonce: nwDV8L
.. section: Library
Fixed issues with binary plists:
Fixed saving bytearrays.
Identical objects will be saved only once.
Equal references will be load as identical objects.
Added support for saving and loading recursive data structures.
..
.. bpo: 32069
.. date: 2017-11-18-17-09-01
.. nonce: S0wyy4
.. section: Library
Drop legacy SSL transport from asyncio, ssl.MemoryBIO is always used anyway.
..
.. bpo: 32066
.. date: 2017-11-17-18-28-53
.. nonce: OMQFLH
.. section: Library
asyncio: Support pathlib.Path in create_unix_connection; sock arg should be
optional
..
.. bpo: 32046
.. date: 2017-11-16-20-09-45
.. nonce: 9sGDtw
.. section: Library
Updates 2to3 to convert from operator.isCallable(obj) to callable(obj).
Patch by Donghee Na.
..
.. bpo: 32018
.. date: 2017-11-16-02-32-41
.. nonce: YMQ7Q2
.. section: Library
inspect.signature should follow :pep:`8`, if the parameter has an annotation
and a default value. Patch by Donghee Na.
..
.. bpo: 32025
.. date: 2017-11-15-20-03-45
.. nonce: lnIKYT
.. section: Library
Add time.thread_time() and time.thread_time_ns()
..
.. bpo: 32037
.. date: 2017-11-15-19-04-22
.. nonce: r8-5Nk
.. section: Library
Integers that fit in a signed 32-bit integer will be now pickled with
protocol 0 using the INT opcode.  This will decrease the size of a pickle,
speed up pickling and unpickling, and make these integers be unpickled as
int instances in Python 2.
..
.. bpo: 32034
.. date: 2017-11-15-13-44-28
.. nonce: uHAOmu
.. section: Library
Make asyncio.IncompleteReadError and LimitOverrunError pickleable.
..
.. bpo: 32015
.. date: 2017-11-13-17-48-33
.. nonce: 4nqRTD
.. section: Library
Fixed the looping of asyncio in the case of reconnection the socket during
waiting async read/write from/to the socket.
..
.. bpo: 32011
.. date: 2017-11-12-20-47-59
.. nonce: NzVDdZ
.. section: Library
Restored support of loading marshal files with the TYPE_INT64 code. These
files can be produced in Python 2.7.
..
.. bpo: 28369
.. date: 2017-11-10-16-27-26
.. nonce: IS74nd
.. section: Library
Enhance add_reader/writer check that socket is not used by some transport.
Before, only cases when add_reader/writer were called with an int FD were
supported.  Now the check is implemented correctly for all file-like
objects.
..
.. bpo: 31976
.. date: 2017-11-09-21-36-32
.. nonce: EOA7qY
.. section: Library
Fix race condition when flushing a file is slow, which can cause a segfault
if closing the file from another thread.
..
.. bpo: 31985
.. date: 2017-11-08-16-51-52
.. nonce: dE_fOB
.. section: Library
Formally deprecated aifc.openfp, sunau.openfp, and wave.openfp. Since change
7bc817d5ba917528e8bd07ec461c635291e7b06a in 1993, openfp in each of the
three modules had been pointing to that module's open function as a matter
of backwards compatibility, though it had been both untested and
undocumented.
..
.. bpo: 21862
.. date: 2017-11-07-15-19-52
.. nonce: RwietE
.. section: Library
cProfile command line now accepts ``-m module_name`` as an alternative to
script path. Patch by Sanyam Khurana.
..
.. bpo: 31970
.. date: 2017-11-07-14-20-09
.. nonce: x4EN_9
.. section: Library
Reduce performance overhead of asyncio debug mode.
..
.. bpo: 31843
.. date: 2017-11-07-00-37-50
.. nonce: lM2gkR
.. section: Library
*database* argument of sqlite3.connect() now accepts a :term:`path-like
object`, instead of just a string.
..
.. bpo: 31945
.. date: 2017-11-05-01-17-12
.. nonce: TLPBtS
.. section: Library
Add Configurable *blocksize* to ``HTTPConnection`` and ``HTTPSConnection``
for improved upload throughput.  Patch by Nir Soffer.
..
.. bpo: 31943
.. date: 2017-11-04-19-28-08
.. nonce: bxw5gM
.. section: Library
Add a ``cancelled()`` method to :class:`asyncio.Handle`.  Patch by Marat
Sharafutdinov.
..
.. bpo: 9678
.. date: 2017-11-03-22-05-47
.. nonce: oD51q6
.. section: Library
Fixed determining the MAC address in the uuid module:
Using ifconfig on NetBSD and OpenBSD.
Using arp on Linux, FreeBSD, NetBSD and OpenBSD.
Based on patch by Takayuki Shimizukawa.
..
.. bpo: 30057
.. date: 2017-11-03-19-11-43
.. nonce: NCaijI
.. section: Library
Fix potential missed signal in signal.signal().
..
.. bpo: 31933
.. date: 2017-11-03-08-36-03
.. nonce: UrtoMP
.. section: Library
Fix Blake2 params leaf_size and node_offset on big endian platforms. Patch
by Jack O'Connor.
..
.. bpo: 21423
.. date: 2017-11-02-22-26-16
.. nonce: hw5mEh
.. section: Library
Add an initializer argument to {Process,Thread}PoolExecutor
..
.. bpo: 31927
.. date: 2017-11-02-18-26-40
.. nonce: 40K6kp
.. section: Library
Fixed compilation of the socket module on NetBSD 8.  Fixed assertion failure
or reading arbitrary data when parse a AF_BLUETOOTH address on NetBSD and
DragonFly BSD.
..
.. bpo: 27666
.. date: 2017-11-01-18-13-42
.. nonce: j2zRnF
.. section: Library
Fixed stack corruption in curses.box() and curses.ungetmouse() when the size
of types chtype or mmask_t is less than the size of C long.  curses.box()
now accepts characters as arguments.  Based on patch by Steve Fink.
..
.. bpo: 31917
.. date: 2017-11-01-03-28-24
.. nonce: DYQL0g
.. section: Library
Add 3 new clock identifiers: :const:`time.CLOCK_BOOTTIME`,
:const:`time.CLOCK_PROF` and :const:`time.CLOCK_UPTIME`.
..
.. bpo: 31897
.. date: 2017-10-30-11-04-56
.. nonce: yjwdEb
.. section: Library
plistlib now catches more errors when read binary plists and raises
InvalidFileException instead of unexpected exceptions.
..
.. bpo: 25720
.. date: 2017-10-29-17-52-40
.. nonce: vSvb5h
.. section: Library
Fix the method for checking pad state of curses WINDOW. Patch by Masayuki
Yamamoto.
..
.. bpo: 31893
.. date: 2017-10-29-13-51-01
.. nonce: 8LZKEz
.. section: Library
Fixed the layout of the kqueue_event structure on OpenBSD and NetBSD. Fixed
the comparison of the kqueue_event objects.
..
.. bpo: 31891
.. date: 2017-10-29-11-23-24
.. nonce: 9kAPha
.. section: Library
Fixed building the curses module on NetBSD.
..
.. bpo: 31884
.. date: 2017-10-27
.. nonce: bjhre9
.. section: Library
added required constants to subprocess module for setting priority on
windows
..
.. bpo: 28281
.. date: 2017-10-26-14-54-38
.. nonce: 7ZN5FG
.. section: Library
Remove year (1-9999) limits on the Calendar.weekday() function.
Patch by Mark Gollahon.
..
.. bpo: 31702
.. date: 2017-10-24-21-10-44
.. nonce: SfwJDI
.. section: Library
crypt.mksalt() now allows to specify the number of rounds for SHA-256 and
SHA-512 hashing.
..
.. bpo: 30639
.. date: 2017-10-24-12-24-56
.. nonce: ptNM9a
.. section: Library
:func:`inspect.getfile` no longer computes the repr of unknown objects to
display in an error message, to protect against badly behaved custom reprs.
..
.. bpo: 30768
.. date: 2017-10-24-12-00-16
.. nonce: Om8Yj_
.. section: Library
Fix the pthread+semaphore implementation of PyThread_acquire_lock_timed()
when called with timeout > 0 and intr_flag=0: recompute the timeout if
sem_timedwait() is interrupted by a signal (EINTR). See also the :pep:`475`.
..
.. bpo: 31854
.. date: 2017-10-23
.. nonce: fh8334f
.. section: Library
Add ``mmap.ACCESS_DEFAULT`` constant.
..
.. bpo: 31834
.. date: 2017-10-23-23-27-52
.. nonce: InwC6O
.. section: Library
Use optimized code for BLAKE2 only with SSSE3+. The pure SSE2 implementation
is slower than the pure C reference implementation.
..
.. bpo: 28292
.. date: 2017-10-23-20-03-36
.. nonce: 1Gkim2
.. section: Library
Calendar.itermonthdates() will now consistently raise an exception when a
date falls outside of the 0001-01-01 through 9999-12-31 range.  To support
applications that cannot tolerate such exceptions, the new methods
itermonthdays3() and itermonthdays4() are added.  The new methods return
tuples and are not restricted by the range supported by datetime.date.
..
.. bpo: 28564
.. date: 2017-10-23-16-22-54
.. nonce: Tx-l-I
.. section: Library
The shutil.rmtree() function has been sped up to 20--40%. This was done
using the os.scandir() function.
..
.. bpo: 28416
.. date: 2017-10-23-12-05-33
.. nonce: Ldnw8X
.. section: Library
Instances of pickle.Pickler subclass with the persistent_id() method and
pickle.Unpickler subclass with the persistent_load() method no longer create
reference cycles.
..
.. bpo: 31653
.. date: 2017-10-22-12-43-03
.. nonce: ttfGvq
.. section: Library
Don't release the GIL if we can acquire a multiprocessing semaphore
immediately.
..
.. bpo: 28326
.. date: 2017-10-22-11-06-02
.. nonce: rxh7L4
.. section: Library
Fix multiprocessing.Process when stdout and/or stderr is closed or None.
..
.. bpo: 20825
.. date: 2017-10-21-09-13-16
.. nonce: -1MBEy
.. section: Library
Add ``subnet_of`` and ``superset_of`` containment tests to
:class:`ipaddress.IPv6Network` and :class:`ipaddress.IPv4Network`. Patch by
Michel Albert and Cheryl Sabella.
..
.. bpo: 31827
.. date: 2017-10-20-16-12-01
.. nonce: 7R8s8s
.. section: Library
Remove the os.stat_float_times() function. It was introduced in Python 2.3
for backward compatibility with Python 2.2, and was deprecated since Python
3.1.
..
.. bpo: 31756
.. date: 2017-10-20-12-57-52
.. nonce: IxCvGB
.. section: Library
Add a ``subprocess.Popen(text=False)`` keyword argument to ``subprocess``
functions to be more explicit about when the library should attempt to
decode outputs into text. Patch by Andrew Clegg.
..
.. bpo: 31819
.. date: 2017-10-19-20-03-13
.. nonce: mw2wF9
.. section: Library
Add AbstractEventLoop.sock_recv_into().
..
.. bpo: 31457
.. date: 2017-10-18-19-05-17
.. nonce: KlE6r8
.. section: Library
If nested log adapters are used, the inner ``process()`` methods are no
longer omitted.
..
.. bpo: 31457
.. date: 2017-10-18-16-48-09
.. nonce: _ovmzp
.. section: Library
The ``manager`` property on LoggerAdapter objects is now properly settable.
..
.. bpo: 31806
.. date: 2017-10-17-23-27-03
.. nonce: TzphdL
.. section: Library
Fix timeout rounding in time.sleep(), threading.Lock.acquire() and
socket.socket.settimeout() to round correctly negative timeouts between -1.0
and 0.0. The functions now block waiting for events as expected. Previously,
the call was incorrectly non-blocking. Patch by Pablo Galindo.
..
.. bpo: 31803
.. date: 2017-10-17-22-55-13
.. nonce: YLL1gJ
.. section: Library
time.clock() and time.get_clock_info('clock') now emit a DeprecationWarning
warning.
..
.. bpo: 31800
.. date: 2017-10-17-20-08-19
.. nonce: foOSCi
.. section: Library
Extended support for parsing UTC offsets. strptime '%z' can now parse the
output generated by datetime.isoformat, including seconds and microseconds.
..
.. bpo: 28603
.. date: 2017-10-17-12-29-18
.. nonce: tGuX2C
.. section: Library
traceback: Fix a TypeError that occurred during printing of exception
tracebacks when either the current exception or an exception in its
context/cause chain is unhashable. Patch by Zane Bitter.
..
.. bpo: 30541
.. date: 2017-10-17-12-04-37
.. nonce: q3BM6C
.. section: Library
Add new function to seal a mock and prevent the automatically creation of
child mocks. Patch by Mario Corchero.
..
.. bpo: 31784
.. date: 2017-10-13-23-35-47
.. nonce: 6e57bd
.. section: Library
Implement the :pep:`564`, add new 6 new functions with nanosecond resolution
to the :mod:`time` module: :func:`~time.clock_gettime_ns`,
:func:`~time.clock_settime_ns`, :func:`~time.monotonic_ns`,
:func:`~time.perf_counter_ns`, :func:`~time.process_time_ns`,
:func:`~time.time_ns`.
..
.. bpo: 30143
.. date: 2017-10-12-19-05-54
.. nonce: 25_hU1
.. section: Library
2to3 now generates a code that uses abstract collection classes from
collections.abc rather than collections.
..
.. bpo: 31770
.. date: 2017-10-12-18-45-38
.. nonce: GV3MPx
.. section: Library
Prevent a crash when calling the ``__init__()`` method of a
``sqlite3.Cursor`` object more than once. Patch by Oren Milman.
..
.. bpo: 31764
.. date: 2017-10-11-22-18-04
.. nonce: EMyIkK
.. section: Library
Prevent a crash in ``sqlite3.Cursor.close()`` in case the ``Cursor`` object
is uninitialized. Patch by Oren Milman.
..
.. bpo: 31752
.. date: 2017-10-11-00-45-01
.. nonce: DhWevN
.. section: Library
Fix possible crash in timedelta constructor called with custom integers.
..
.. bpo: 31620
.. date: 2017-10-06-04-35-31
.. nonce: gksLA1
.. section: Library
an empty asyncio.Queue now doesn't leak memory when queue.get pollers
timeout
..
.. bpo: 31690
.. date: 2017-10-05-15-14-46
.. nonce: f0XteV
.. section: Library
Allow the flags re.ASCII, re.LOCALE, and re.UNICODE to be used as group
flags for regular expressions.
..
.. bpo: 30349
.. date: 2017-10-05-12-45-29
.. nonce: 6zKJsF
.. section: Library
FutureWarning is now emitted if a regular expression contains character set
constructs that will change semantically in the future (nested sets and set
operations).
..
.. bpo: 31664
.. date: 2017-10-04-20-36-28
.. nonce: 4VDUzo
.. section: Library
Added support for the Blowfish hashing in the crypt module.
..
.. bpo: 31632
.. date: 2017-10-04-11-37-14
.. nonce: LiOC3C
.. section: Library
Fix method set_protocol() of class _SSLProtocolTransport in asyncio module.
This method was previously modifying a wrong reference to the protocol.
..
.. bpo: 15037
.. date: 2017-09-29-19-19-36
.. nonce: ykimLK
.. section: Library
Added a workaround for getkey() in curses for ncurses 5.7 and earlier.
..
.. bpo: 31307
.. date: 2017-09-07-12-50-28
.. nonce: AVBiNY
.. section: Library
Allow use of bytes objects for arguments to
:meth:`configparser.ConfigParser.read`. Patch by Vincent Michel.
..
.. bpo: 31334
.. date: 2017-09-04-00-22-31
.. nonce: 9WYRfi
.. section: Library
Fix ``poll.poll([timeout])`` in the ``select`` module for arbitrary negative
timeouts on all OSes where it can only be a non-negative integer or -1.
Patch by Riccardo Coccioli.
..
.. bpo: 31310
.. date: 2017-08-30-18-23-54
.. nonce: 7D1UNt
.. section: Library
multiprocessing's semaphore tracker should be launched again if crashed.
..
.. bpo: 31308
.. date: 2017-08-30-17-59-36
.. nonce: KbexyC
.. section: Library
Make multiprocessing's forkserver process immune to Ctrl-C and other user
interruptions. If it crashes, restart it when necessary.
..
.. bpo: 31245
.. date: 2017-08-22-11-05-35
.. nonce: AniZuz
.. section: Library
Added support for AF_UNIX socket in asyncio ``create_datagram_endpoint``.
..
.. bpo: 30553
.. date: 2017-07-05-14-48-26
.. nonce: Oupsxo
.. section: Library
Add HTTP/2 status code 421 (Misdirected Request) to
:class:`http.HTTPStatus`. Patch by Vitor Pereira.
..
.. bpo: 32105
.. date: 2017-11-21-10-54-16
.. nonce: 91mhWm
.. section: Documentation
Added asyncio.BaseEventLoop.connect_accepted_socket versionadded marker.
..
.. bpo: 31380
.. date: 2017-12-04-23-19-16
.. nonce: VlMmHW
.. section: Tests
Skip test_httpservers test_undecodable_file on macOS: fails on APFS.
..
.. bpo: 31705
.. date: 2017-11-30-12-27-10
.. nonce: yULW7O
.. section: Tests
Skip test_socket.test_sha256() on Linux kernel older than 4.5. The test
fails with ENOKEY on kernel 3.10 (on ppc64le). A fix was merged into the
kernel 4.5.
..
.. bpo: 32138
.. date: 2017-11-27-16-18-58
.. nonce: QsTvf-
.. section: Tests
Skip on Android test_faulthandler tests that raise SIGSEGV and remove the
test.support.requires_android_level decorator.
..
.. bpo: 32136
.. date: 2017-11-26-17-11-27
.. nonce: Y11luJ
.. section: Tests
The runtime embedding tests have been split out from
``Lib/test/test_capi.py`` into a new ``Lib/test/test_embed.py`` file.
..
.. bpo: 28668
.. date: 2017-11-25-14-53-29
.. nonce: Y1G6pA
.. section: Tests
test.support.requires_multiprocessing_queue is removed. Skip tests with
test.support.import_module('multiprocessing.synchronize') instead when the
semaphore implementation is broken or missing.
..
.. bpo: 32126
.. date: 2017-11-24-18-15-12
.. nonce: PLmNLn
.. section: Tests
Skip test_get_event_loop_new_process in test.test_asyncio.test_events when
sem_open() is not functional.
..
.. bpo: 31174
.. date: 2017-10-24-11-36-10
.. nonce: xCvXcr
.. section: Tests
Fix test_tools.test_unparse: DirectoryTestCase now stores the names sample
to always test the same files. It prevents false alarms when hunting
reference leaks.
..
.. bpo: 28538
.. date: 2017-11-21-17-27-59
.. nonce: DsNBS7
.. section: Build
Revert the previous changes, the if_nameindex structure is defined by
Unified Headers.
..
.. bpo: 28762
.. date: 2017-11-21-17-12-24
.. nonce: R6uu8w
.. section: Build
Revert the last commit, the F_LOCK macro is defined by Android Unified
Headers.
..
.. bpo: 29040
.. date: 2017-11-21-16-56-24
.. nonce: 14lCSr
.. section: Build
Support building Android with Unified Headers. The first NDK release to
support Unified Headers is android-ndk-r14.
..
.. bpo: 32059
.. date: 2017-11-18-11-19-28
.. nonce: a0Hxgp
.. section: Build
``detect_modules()`` in ``setup.py`` now also searches the sysroot paths
when cross-compiling.
..
.. bpo: 31957
.. date: 2017-11-06-11-53-39
.. nonce: S_1jFK
.. section: Build
Fixes Windows SDK version detection when building for Windows.
..
.. bpo: 31609
.. date: 2017-11-04-15-35-08
.. nonce: k7_nBR
.. section: Build
Fixes quotes in PCbuild/clean.bat
..
.. bpo: 31934
.. date: 2017-11-03-15-17-50
.. nonce: 8bUlpv
.. section: Build
Abort the build when building out of a not clean source tree.
..
.. bpo: 31926
.. date: 2017-11-03-10-07-14
.. nonce: 57wE98
.. section: Build
Fixed Argument Clinic sometimes causing compilation errors when there was
more than one function and/or method in a .c file with the same name.
..
.. bpo: 28791
.. date: 2017-11-02-20-30-57
.. nonce: VaE3o8
.. section: Build
Update Windows builds to use SQLite 3.21.0.
..
.. bpo: 28791
.. date: 2017-11-02-20-13-46
.. nonce: STt3jL
.. section: Build
Update OS X installer to use SQLite 3.21.0.
..
.. bpo: 28643
.. date: 2017-11-01-14-16-27
.. nonce: 9iPKJy
.. section: Build
Record profile-opt build progress with stamp files.
..
.. bpo: 31866
.. date: 2017-10-24-23-21-13
.. nonce: MkNO66
.. section: Build
Finish removing support for AtheOS.
..
.. bpo: 1102
.. date: 2017-11-19-09-46-27
.. nonce: NY-g1F
.. section: Windows
Return ``None`` when ``View.Fetch()`` returns ``ERROR_NO_MORE_ITEMS``
instead of raising ``MSIError``.
Initial patch by Anthony Tuininga.
..
.. bpo: 31944
.. date: 2017-11-04-15-29-47
.. nonce: 0Bx8tZ
.. section: Windows
Fixes Modify button in Apps and Features dialog.
..
.. bpo: 20486
.. date: 2017-10-26-23-02-57
.. nonce: 3IdsZ1
.. section: Windows
Implement the ``Database.Close()`` method to help closing MSI database
objects.
..
.. bpo: 31857
.. date: 2017-10-23-18-35-50
.. nonce: YwhEvc
.. section: Windows
Make the behavior of USE_STACKCHECK deterministic in a multi-threaded
environment.
..
.. bpo: 31392
.. date: 2017-12-04-21-57-43
.. nonce: f8huBC
.. section: macOS
Update macOS installer to use OpenSSL 1.0.2m
..
.. bpo: 32207
.. date: 2017-12-04-15-04-43
.. nonce: IzyAJo
.. section: IDLE
Improve tk event exception tracebacks in IDLE. When tk event handling is
driven by IDLE's run loop, a confusing and distracting queue.EMPTY traceback
context is no longer added to tk event exception tracebacks.  The traceback
is now the same as when event handling is driven by user code.  Patch based
on a suggestion by Serhiy Storchaka.
..
.. bpo: 32164
.. date: 2017-11-28-21-47-15
.. nonce: 2T2Na8
.. section: IDLE
Delete unused file idlelib/tabbedpages.py. Use of TabbedPageSet in
configdialog was replaced by ttk.Notebook.
..
.. bpo: 32100
.. date: 2017-11-21-08-26-08
.. nonce: P43qx2
.. section: IDLE
IDLE: Fix old and new bugs in pathbrowser; improve tests. Patch mostly by
Cheryl Sabella.
..
.. bpo: 31858
.. date: 2017-10-26-20-20-19
.. nonce: VuSA_e
.. section: IDLE
IDLE -- Restrict shell prompt manipulation to the shell. Editor and output
windows only see an empty last prompt line.  This simplifies the code and
fixes a minor bug when newline is inserted. Sys.ps1, if present, is read on
Shell start-up, but is not set or changed.
..
.. bpo: 31860
.. date: 2017-10-24-16-21-50
.. nonce: gECuWx
.. section: IDLE
The font sample in the IDLE configuration dialog is now editable. Changes
persist while IDLE remains open
..
.. bpo: 31836
.. date: 2017-10-21-15-41-53
.. nonce: fheLME
.. section: IDLE
Test_code_module now passes if run after test_idle, which sets ps1.
The code module uses sys.ps1 if present or sets it to '>>> ' if not.
Test_code_module now properly tests both behaviors.  Ditto for ps2.
..
.. bpo: 28603
.. date: 2017-10-17-13-26-13
.. nonce: TMEQfp
.. section: IDLE
Fix a TypeError that caused a shell restart when printing a traceback that
includes an exception that is unhashable. Patch by Zane Bitter.
..
.. bpo: 13802
.. date: 2017-10-12-00-51-29
.. nonce: VwjZRD
.. section: IDLE
Use non-Latin characters in the IDLE's Font settings sample. Even if one
selects a font that defines a limited subset of the unicode Basic
Multilingual Plane, tcl/tk will use other fonts that define a character. The
expanded example give users of non-Latin characters a better idea of what
they might see in IDLE's shell and editors.
To make room for the expanded sample, frames on the Font tab are
re-arranged.  The Font/Tabs help explains a bit about the additions.
..
.. bpo: 32159
.. date: 2017-11-28-21-24-41
.. nonce: RSl4QK
.. section: Tools/Demos
Remove CVS and Subversion tools: remove svneol.py and treesync.py scripts.
CPython migrated from CVS to Subversion, to Mercurial, and then to Git. CVS
and Subversion are no longer used to develop CPython.
..
.. bpo: 30722
.. date: 2017-10-23-19-45-52
.. nonce: ioRlAu
.. section: Tools/Demos
Make redemo work with Python 3.6 and newer versions.
Also, remove the ``LOCALE`` option since it doesn't work with string
patterns in Python 3.
Patch by Christoph Sarnowski.
..
.. bpo: 20891
.. date: 2017-11-30-18-13-45
.. nonce: wBnMdF
.. section: C API
Fix PyGILState_Ensure(). When PyGILState_Ensure() is called in a non-Python
thread before PyEval_InitThreads(), only call PyEval_InitThreads() after
calling PyThreadState_New() to fix a crash.
..
.. bpo: 32125
.. date: 2017-11-24-21-25-43
.. nonce: K8zWgn
.. section: C API
The ``Py_UseClassExceptionsFlag`` flag has been removed. It was deprecated
and wasn't used anymore since Python 2.0.
..
.. bpo: 25612
.. date: 2017-10-22-13-12-28
.. nonce: 1jnWKT
.. section: C API
Move the current exception state from the frame object to the co-routine.
This simplifies the interpreter and fixes a couple of obscure bugs caused by
having swap exception state when entering or exiting a generator.
..
.. bpo: 23699
.. date: 2017-10-19-15-27-04
.. nonce: -noVVc
.. section: C API
Add Py_RETURN_RICHCOMPARE macro to reduce boilerplate code in rich
comparison functions.
..
.. bpo: 30697
.. date: 2017-06-30-11-58-01
.. nonce: Q3T_8n
.. section: C API
The ``PyExc_RecursionErrorInst`` singleton is removed and
``PyErr_NormalizeException()`` does not use it anymore. This singleton is
persistent and its members being never cleared may cause a segfault during
finalization of the interpreter. See also issue #22898.

.. bpo: 43434
.. date: 2021-05-02-17-50-23
.. nonce: cy7xz6
.. release date: 2021-05-03
.. section: Security
Creating :class:`sqlite3.Connection` objects now also produces
``sqlite3.connect`` and ``sqlite3.connect/handle`` :ref:`auditing events
<auditing>`. Previously these events were only produced by
:func:`sqlite3.connect` calls. Patch by Erlend E. Aasland.
..
.. bpo: 43998
.. date: 2021-05-01-13-13-40
.. nonce: xhmWD7
.. section: Security
The :mod:`ssl` module sets more secure cipher suites defaults. Ciphers
without forward secrecy and with SHA-1 MAC are disabled by default. Security
level 2 prohibits weak RSA, DH, and ECC keys with less than 112 bits of
security. :class:`~ssl.SSLContext` defaults to minimum protocol version TLS
1.2. Settings are based on Hynek Schlawack's research.
..
.. bpo: 43882
.. date: 2021-04-25-07-46-37
.. nonce: Jpwx85
.. section: Security
The presence of newline or tab characters in parts of a URL could allow some
forms of attacks.
Following the controlling specification for URLs defined by WHATWG
:func:`urllib.parse` now removes ASCII newlines and tabs from URLs,
preventing such attacks.
..
.. bpo: 43472
.. date: 2021-04-21-22-53-31
.. nonce: gjLBTb
.. section: Security
Ensures interpreter-level audit hooks receive the
``cpython.PyInterpreterState_New`` event when called through the
``_xxsubinterpreters`` module.
..
.. bpo: 43362
.. date: 2021-04-18-00-56-44
.. nonce: __5aiP
.. section: Security
Fix invalid free in _sha3 module. The issue was introduced in 3.10.0a1.
Python 3.9 and earlier are not affected.
..
.. bpo: 43762
.. date: 2021-04-07-12-57-41
.. nonce: 7lMtpT
.. section: Security
Add audit events for :func:`sqlite3.connect/handle`,
:meth:`sqlite3.Connection.enable_load_extension`, and
:meth:`sqlite3.Connection.load_extension`. Patch by Erlend E. Aasland.
..
.. bpo: 43756
.. date: 2021-04-06-18-07-48
.. nonce: DLBNqQ
.. section: Security
Add new audit event ``glob.glob/2`` to incorporate the new *root_dir* and
*dir_fd* arguments added to :func:`glob.glob` and :func:`glob.iglob`.
..
.. bpo: 36384
.. date: 2021-03-30-16-29-51
.. nonce: sCAmLs
.. section: Security
:mod:`ipaddress` module no longer accepts any leading zeros in IPv4 address
strings. Leading zeros are ambiguous and interpreted as octal notation by
some libraries. For example the legacy function :func:`socket.inet_aton`
treats leading zeros as octal notation. glibc implementation of modern
:func:`~socket.inet_pton` does not accept any leading zeros. For a while the
:mod:`ipaddress` module used to accept ambiguous leading zeros.
..
.. bpo: 43075
.. date: 2021-01-31-05-28-14
.. nonce: DoAXqO
.. section: Security
Fix Regular Expression Denial of Service (ReDoS) vulnerability in
:class:`urllib.request.AbstractBasicAuthHandler`.  The ReDoS-vulnerable
regex has quadratic worst-case complexity and it allows cause a denial of
service when identifying crafted invalid RFCs. This ReDoS issue is on the
client side and needs remote attackers to control the HTTP server.
..
.. bpo: 42800
.. date: 2021-01-09-17-07-36
.. nonce: _dtZvW
.. section: Security
Audit hooks are now fired for frame.f_code, traceback.tb_frame, and
generator code/frame attribute access.
..
.. bpo: 37363
.. date: 2020-07-04-22-14-46
.. nonce: NDjHNw
.. section: Security
Add audit events to the :mod:`http.client` module.
..
.. bpo: 43977
.. date: 2021-05-02-11-59-00
.. nonce: R0hSDo
.. section: Core and Builtins
Prevent classes being both a sequence and a mapping when pattern matching.
..
.. bpo: 43977
.. date: 2021-04-29-17-40-25
.. nonce: FrQhge
.. section: Core and Builtins
Use :c:member:`~PyTypeObject.tp_flags` on the class object to determine if
the subject is a sequence or mapping when pattern matching. Avoids the need
to import :mod:`collections.abc` when pattern matching.
..
.. bpo: 43892
.. date: 2021-04-29-16-00-28
.. nonce: WXIehI
.. section: Core and Builtins
Restore proper validation of complex literal value patterns when parsing
:keyword:`!match` blocks.
..
.. bpo: 43933
.. date: 2021-04-29-13-49-57
.. nonce: TueFdQ
.. section: Core and Builtins
Set frame.f_lineno to the line number of the 'with' kweyword when executing
the call to ``__exit__``.
..
.. bpo: 43933
.. date: 2021-04-29-13-11-44
.. nonce: mvoV6O
.. section: Core and Builtins
If the current position in a frame has no line number then set the f_lineno
attribute to None, instead of -1, to conform to PEP 626. This should not
normally be possible, but might occur in some unusual circumstances.
..
.. bpo: 43963
.. date: 2021-04-28-01-23-38
.. nonce: u5Y6bS
.. section: Core and Builtins
Importing the :mod:`!_signal` module in a subinterpreter has no longer side
effects.
..
.. bpo: 42739
.. date: 2021-04-27-10-59-10
.. nonce: PrVkKM
.. section: Core and Builtins
The internal representation of line number tables is changed to not use
sentinels, and an explicit length parameter is added to the out of process
API function ``PyLineTable_InitAddressRange``. This makes the handling of
line number tables more robust in some circumstances.
..
.. bpo: 43908
.. date: 2021-04-26-21-20-41
.. nonce: 2L51nO
.. section: Library
Make :mod:`re` types immutable. Patch by Erlend E. Aasland.
..
.. bpo: 43908
.. date: 2021-04-26-20-59-17
.. nonce: -COW4-
.. section: Library
Make the :class:`array.array` type immutable. Patch by Erlend E. Aasland.
..
.. bpo: 43901
.. date: 2021-04-25-22-50-47
.. nonce: oKjG5E
.. section: Core and Builtins
Change class and module objects to lazy-create empty annotations dicts on
demand.  The annotations dicts are stored in the object's __dict__ for
backwards compatibility.
..
.. bpo: 43892
.. date: 2021-04-25-08-35-11
.. nonce: hr5Ke2
.. section: Core and Builtins
Match patterns now use new dedicated AST nodes (``MatchValue``,
``MatchSingleton``, ``MatchSequence``, ``MatchStar``, ``MatchMapping``,
``MatchClass``) rather than reusing expression AST nodes. ``MatchAs`` and
``MatchOr`` are now defined as pattern nodes rather than as expression
nodes. Patch by Nick Coghlan.
..
.. bpo: 42725
.. date: 2021-04-25-05-40-51
.. nonce: WGloYm
.. section: Core and Builtins
Usage of ``await``/``yield``/``yield from`` and named expressions within an
annotation is now forbidden when PEP 563 is activated.
..
.. bpo: 43754
.. date: 2021-04-24-16-40-23
.. nonce: 9SzHWG
.. section: Core and Builtins
When performing structural pattern matching (:pep:`634`), captured names are
now left unbound until the *entire* pattern has matched successfully.
..
.. bpo: 42737
.. date: 2021-04-22-22-48-30
.. nonce: lsJ7pD
.. section: Core and Builtins
Annotations for complex targets (everything beside simple names) no longer
cause any runtime effects with ``from __future__ import annotations``.
..
.. bpo: 43914
.. date: 2021-04-22-19-09-58
.. nonce: 0Ik1AM
.. section: Core and Builtins
:exc:`SyntaxError` exceptions raised by the interpreter will highlight the
full error range of the expression that constitutes the syntax error itself,
instead of just where the problem is detected. Patch by Pablo Galindo.
..
.. bpo: 38605
.. date: 2021-04-20-22-17-47
.. nonce: 9eeCNZ
.. section: Core and Builtins
Revert making ``from __future__ import annotations`` the default. This
follows the Steering Council decision to postpone PEP 563 changes to at
least Python 3.11. See the original email for more information regarding the
decision:
https://mail.python.org/archives/list/python-dev@python.org/thread/CLVXXPQ2T2LQ5MP2Y53VVQFCXYWQJHKZ/.
Patch by Pablo Galindo.
..
.. bpo: 43475
.. date: 2021-04-20-20-10-46
.. nonce: oV8Mbs
.. section: Core and Builtins
Hashes of NaN values now depend on object identity.  Formerly, they always
hashed to 0 even though NaN values are not equal to one another.  Having the
same hash for unequal values caused pile-ups in hash tables.
..
.. bpo: 43859
.. date: 2021-04-16-01-26-57
.. nonce: QfqjFL
.. section: Core and Builtins
Improve the error message for :exc:`IndentationError` exceptions. Patch by
Pablo Galindo
..
.. bpo: 41323
.. date: 2021-04-15-10-19-59
.. nonce: nsvpSg
.. section: Core and Builtins
Constant tuple folding in bytecode optimizer now reuses tuple in constant
table.
..
.. bpo: 43846
.. date: 2021-04-14-13-53-08
.. nonce: 2jO97c
.. section: Core and Builtins
Data stack usage is much reduced for large literal and call expressions.
..
.. bpo: 38530
.. date: 2021-04-14-03-53-06
.. nonce: rNI_G1
.. section: Core and Builtins
When printing :exc:`NameError` raised by the interpreter,
:c:func:`PyErr_Display` will offer suggestions of similar variable names in
the function that the exception was raised from. Patch by Pablo Galindo
..
.. bpo: 43823
.. date: 2021-04-13-03-06-09
.. nonce: xpuHBi
.. section: Core and Builtins
Improve syntax errors for invalid dictionary literals. Patch by Pablo
Galindo.
..
.. bpo: 43822
.. date: 2021-04-13-02-32-18
.. nonce: lej0OO
.. section: Core and Builtins
Improve syntax errors in the parser for missing commas between expressions.
Patch by Pablo Galindo.
..
.. bpo: 43798
.. date: 2021-04-10-00-01-43
.. nonce: p_nJFM
.. section: Core and Builtins
:class:`ast.alias` nodes now include source location metadata attributes
e.g. lineno, col_offset.
..
.. bpo: 43797
.. date: 2021-04-09-19-12-48
.. nonce: HfRqNP
.. section: Core and Builtins
Improve ``SyntaxError`` error messages for invalid comparisons. Patch by
Pablo Galindo.
..
.. bpo: 43760
.. date: 2021-04-08-12-20-29
.. nonce: tBIsD8
.. section: Core and Builtins
Move the flag for checking whether tracing is enabled to the C stack, from
the heap. Should speed up dispatch in the interpreter.
..
.. bpo: 43682
.. date: 2021-04-08-01-06-22
.. nonce: eUn4p5
.. section: Core and Builtins
Static methods (:deco:`staticmethod`) and class methods
(:deco:`classmethod`) now inherit the method attributes
(``__module__``, ``__name__``, ``__qualname__``, ``__doc__``,
``__annotations__``) and have a new ``__wrapped__`` attribute. Patch by
Victor Stinner.
..
.. bpo: 43751
.. date: 2021-04-07-18-00-05
.. nonce: 8fHsqQ
.. section: Core and Builtins
Fixed a bug where ``anext(ait, default)`` would erroneously return None.
..
.. bpo: 42128
.. date: 2021-04-05-17-38-08
.. nonce: 1uVeGK
.. section: Core and Builtins
:data:`~object.__match_args__` is no longer allowed to be a list.
..
.. bpo: 43683
.. date: 2021-04-01-12-30-30
.. nonce: AjxOx2
.. section: Core and Builtins
Add GEN_START opcode. Marks start of generator, including async, or
coroutine and handles sending values to a newly created generator or
coroutine.
..
.. bpo: 43105
.. date: 2021-03-31-20-35-11
.. nonce: PBVmHm
.. section: Library
Importlib now resolves relative paths when creating module spec objects from
file locations.
..
.. bpo: 43682
.. date: 2021-03-31-16-32-57
.. nonce: VSF3vg
.. section: Core and Builtins
Static methods (:deco:`staticmethod`) are now callable as
regular functions. Patch by Victor Stinner.
..
.. bpo: 42609
.. date: 2020-12-12-14-28-31
.. nonce: Qcd54b
.. section: Core and Builtins
Prevented crashes in the AST validator and optimizer when compiling some
absurdly long expressions like ``"+0"*1000000``. :exc:`RecursionError` is
now raised instead.
..
.. bpo: 38530
.. date: 2019-10-27-20-20-07
.. nonce: ZyoDNn
.. section: Core and Builtins
When printing :exc:`AttributeError`, :c:func:`PyErr_Display` will offer
suggestions of similar attribute names in the object that the exception was
raised from. Patch by Pablo Galindo
..
.. bpo: 44015
.. date: 2021-05-03-03-03-49
.. nonce: V5936k
.. section: Library
In @dataclass(), raise a TypeError if KW_ONLY is specified more than once.
..
.. bpo: 25478
.. date: 2021-05-02-19-17-20
.. nonce: AwlwdA
.. section: Library
Added a *total()* method to collections.Counter() to compute the sum of the
counts.
..
.. bpo: 43733
.. date: 2021-05-01-22-59-20
.. nonce: gJWwEQ
.. section: Library
Change :class:`netrc.netrc` to use UTF-8 encoding before using locale
encoding.
..
.. bpo: 43979
.. date: 2021-05-01-01-36-51
.. nonce: 43oJ9L
.. section: Library
Removed an unnecessary list comprehension before looping from
:func:`urllib.parse.parse_qsl`.  Patch by Christoph Zwerschke and Donghee
Na.
..
.. bpo: 43993
.. date: 2021-04-30-19-23-45
.. nonce: T7_yoq
.. section: Library
Update bundled pip to 21.1.1.
..
.. bpo: 43957
.. date: 2021-04-27-12-13-51
.. nonce: 6EaPD-
.. section: Library
[Enum] Deprecate ``TypeError`` when non-member is used in a containment
check; In 3.12 ``True`` or ``False`` will be returned instead, and
containment will return ``True`` if the value is either a member of that
enum or one of its members' value.
..
.. bpo: 42904
.. date: 2021-04-26-23-39-47
.. nonce: ejjsyR
.. section: Library
For backwards compatibility with previous minor versions of Python, if
:func:`typing.get_type_hints` receives no namespace dictionary arguments,
:func:`typing.get_type_hints` will search through the global then local
namespaces during evaluation of stringized type annotations (string forward
references) inside a class.
..
.. bpo: 43945
.. date: 2021-04-26-20-52-16
.. nonce: NgERXO
.. section: Library
[Enum] Deprecate non-standard mixin format() behavior: in 3.12 the enum
member, not the member's value, will be used for format() calls.
..
.. bpo: 41139
.. date: 2021-04-26-17-47-48
.. nonce: ROhn1k
.. section: Library
Deprecate undocumented ``cgi.log()`` API.
..
.. bpo: 43937
.. date: 2021-04-25-13-34-13
.. nonce: isx95l
.. section: Library
Fixed the :mod:`turtle` module working with non-default root window.
..
.. bpo: 43930
.. date: 2021-04-24-14-23-07
.. nonce: R7ah0m
.. section: Library
Update bundled pip to 21.1 and setuptools to 56.0.0
..
.. bpo: 43907
.. date: 2021-04-23-20-57-20
.. nonce: 3RJEjv
.. section: Library
Fix a bug in the pure-Python pickle implementation when using protocol 5,
where bytearray instances that occur several time in the pickled object
graph would incorrectly unpickle into repeated copies of the bytearray
object.
..
.. bpo: 43926
.. date: 2021-04-23-17-48-55
.. nonce: HMUlGU
.. section: Library
In ``importlib.metadata``, provide a uniform interface to ``Description``,
allow for any field to be encoded with multiline values, remove continuation
lines from multiline values, and add a ``.json`` property for easy access to
the PEP 566 JSON-compatible form. Sync with ``importlib_metadata 4.0``.
..
.. bpo: 43920
.. date: 2021-04-23-11-54-38
.. nonce: cJMQ2D
.. section: Library
OpenSSL 3.0.0: :meth:`~ssl.SSLContext.load_verify_locations` now returns a
consistent error message when cadata contains no valid certificate.
..
.. bpo: 43607
.. date: 2021-04-22-22-39-58
.. nonce: 7IYDkG
.. section: Library
:mod:`urllib` can now convert Windows paths with ``\\?\`` prefixes into URL
paths.
..
.. bpo: 43817
.. date: 2021-04-22-04-12-13
.. nonce: FQ-XlH
.. section: Library
Add :func:`inspect.get_annotations`, which safely computes the annotations
defined on an object.  It works around the quirks of accessing the
annotations from various types of objects, and makes very few assumptions
about the object passed in. :func:`inspect.get_annotations` can also
correctly un-stringize stringized annotations.
:func:`inspect.signature`, :func:`inspect.from_callable`, and
:func:`inspect.from_function` now call :func:`inspect.get_annotations` to
retrieve annotations.  This means :func:`inspect.signature` and
:func:`inspect.from_callable` can now un-stringize stringized annotations,
too.
..
.. bpo: 43284
.. date: 2021-04-21-14-50-57
.. nonce: 2QZn2T
.. section: Library
platform.win32_ver derives the windows version from
sys.getwindowsversion().platform_version which in turn derives the version
from kernel32.dll (which can be of a different version than Windows itself).
Therefore change the platform.win32_ver to determine the version using the
platform module's _syscmd_ver private function to return an accurate
version.
..
.. bpo: 42854
.. date: 2021-04-19-03-54-29
.. nonce: Y4M7Tv
.. section: Library
The :mod:`ssl` module now uses ``SSL_read_ex`` and ``SSL_write_ex``
internally. The functions support reading and writing of data larger than 2
GB. Writing zero-length data no longer fails with a protocol violation
error.
..
.. bpo: 42333
.. date: 2021-04-17-19-31-17
.. nonce: cgbtZO
.. section: Library
Port ``_ssl`` extension module to multiphase initialization.
..
.. bpo: 43880
.. date: 2021-04-17-13-53-33
.. nonce: -fC2JD
.. section: Library
:mod:`ssl` now raises DeprecationWarning for OP_NO_SSL/TLS* options, old TLS
versions, old protocols, and other features that have been deprecated since
Python 3.6, 3.7, or OpenSSL 1.1.0.
..
.. bpo: 41559
.. date: 2021-04-17-10-49-57
.. nonce: caIwt9
.. section: Library
:pep:`612` is now implemented purely in Python; builtin
``types.GenericAlias`` objects no longer include ``typing.ParamSpec`` in
``__parameters__`` (with the exception of ``collections.abc.Callable``\ 's
``GenericAlias``). This means previously invalid uses of ``ParamSpec`` (such
as ``list[P]``) which worked in earlier versions of Python 3.10 alpha, will
now raise ``TypeError`` during substitution.
..
.. bpo: 43867
.. date: 2021-04-16-16-46-44
.. nonce: xT9QjF
.. section: Library
The :mod:`multiprocessing` ``Server`` class now explicitly catches
:exc:`SystemExit` and closes the client connection in this case. It happens
when the ``Server.serve_client()`` method reaches the end of file (EOF).
..
.. bpo: 40443
.. date: 2021-04-16-02-03-00
.. nonce: Io6FHL
.. section: Library
Remove unused imports: pyclbr no longer uses copy, and typing no longer uses
ast. Patch by Victor Stinner.
..
.. bpo: 43820
.. date: 2021-04-12-18-01-10
.. nonce: YkqYW4
.. section: Library
Remove an unneeded copy of the namespace passed to
dataclasses.make_dataclass().
..
.. bpo: 43787
.. date: 2021-04-12-15-15-50
.. nonce: wCy_Wd
.. section: Library
Add ``__iter__()`` method to :class:`bz2.BZ2File`, :class:`gzip.GzipFile`,
and :class:`lzma.LZMAFile`. It makes iterating them about 2x faster. Patch
by Inada Naoki.
..
.. bpo: 43680
.. date: 2021-04-12-11-20-34
.. nonce: SR0Epv
.. section: Library
Deprecate io.OpenWrapper and _pyio.OpenWrapper: use io.open and _pyio.open
instead. Until Python 3.9, _pyio.open was not a static method and
builtins.open was set to OpenWrapper to not become a bound method when set
to a class variable. _io.open is a built-in function whereas _pyio.open is a
Python function. In Python 3.10, _pyio.open() is now a static method, and
builtins.open() is now io.open().
..
.. bpo: 43680
.. date: 2021-04-12-09-57-37
.. nonce: o1zEk_
.. section: Library
The Python :func:`!_pyio.open` function becomes a static method to behave as
:func:`io.open` built-in function: don't become a bound method when stored
as a class variable. It becomes possible since static methods are now
callable in Python 3.10. Moreover, :func:`!_pyio.OpenWrapper` becomes a
simple alias to :func:`!_pyio.open`. Patch by Victor Stinner.
..
.. bpo: 41515
.. date: 2021-04-12-06-01-10
.. nonce: YaVReb
.. section: Library
Fix :exc:`KeyError` raised in :func:`typing.get_type_hints` due to synthetic
modules that don't appear in ``sys.modules``.
..
.. bpo: 43776
.. date: 2021-04-12-00-00-00
.. nonce: p14y7a
.. section: Library
When :class:`subprocess.Popen` args are provided as a string or as
:class:`pathlib.Path`, the Popen instance repr now shows the right thing.
..
.. bpo: 42248
.. date: 2021-04-11-21-10-57
.. nonce: pedB1E
.. section: Library
[Enum] ensure exceptions raised in ``_missing__`` are released
..
.. bpo: 43744
.. date: 2021-04-11-20-52-32
.. nonce: uf0E68
.. section: Library
fix issue with enum member name matching the start of a private variable
name
..
.. bpo: 43772
.. date: 2021-04-10-19-14-49
.. nonce: Bxq0zQ
.. section: Library
Fixed the return value of ``TypeVar.__ror__``. Patch by Jelle Zijlstra.
..
.. bpo: 43764
.. date: 2021-04-10-18-23-09
.. nonce: Le5KJp
.. section: Library
Add match_args parameter to @dataclass decorator to allow suppression of
__match_args__ generation.
..
.. bpo: 43799
.. date: 2021-04-10-11-35-50
.. nonce: 1iV4pX
.. section: Library
OpenSSL 3.0.0: define ``OPENSSL_API_COMPAT`` 1.1.1 to suppress deprecation
warnings. Python requires OpenSSL 1.1.1 APIs.
..
.. bpo: 43478
.. date: 2021-04-10-03-30-36
.. nonce: iZcBTq
.. section: Library
Mocks can no longer be used as the specs for other Mocks. As a result, an
already-mocked object cannot have an attribute mocked using
``autospec=True`` or be the subject of a ``create_autospec(...)`` call. This
can uncover bugs in tests since these Mock-derived Mocks will always pass
certain tests (e.g. :func:`isinstance`) and builtin assert functions (e.g.
assert_called_once_with) will unconditionally pass.
..
.. bpo: 43794
.. date: 2021-04-09-16-14-22
.. nonce: -1XPDH
.. section: Library
Add :const:`ssl.OP_IGNORE_UNEXPECTED_EOF` constants (OpenSSL 3.0.0)
..
.. bpo: 43785
.. date: 2021-04-09-14-51-58
.. nonce: 1mM5xE
.. section: Library
Improve ``bz2.BZ2File`` performance by removing the RLock from BZ2File. This
makes BZ2File thread unsafe in the face of multiple simultaneous readers or
writers, just like its equivalent classes in :mod:`gzip` and :mod:`lzma`
have always been.  Patch by Inada Naoki.
..
.. bpo: 43789
.. date: 2021-04-09-14-08-03
.. nonce: eaHlAm
.. section: Library
OpenSSL 3.0.0: Don't call the password callback function a second time when
first call has signaled an error condition.
..
.. bpo: 43788
.. date: 2021-04-09-12-08-01
.. nonce: YsvInM
.. section: Library
The header files for :mod:`ssl` error codes are now OpenSSL
version-specific. Exceptions will now show correct reason and library codes.
The ``make_ssl_data.py`` script has been rewritten to use OpenSSL's text
file with error codes.
..
.. bpo: 43766
.. date: 2021-04-09-00-16-22
.. nonce: nYNQP0
.. section: Library
Implement :pep:`647` in the :mod:`typing` module by adding
:data:`TypeGuard`.
..
.. bpo: 25264
.. date: 2021-04-08-22-11-27
.. nonce: b33fa0
.. section: Library
:func:`os.path.realpath` now accepts a *strict* keyword-only argument. When
set to ``True``, :exc:`OSError` is raised if a path doesn't exist or a
symlink loop is encountered.
..
.. bpo: 43780
.. date: 2021-04-08-20-04-46
.. nonce: hUOgCh
.. section: Library
In ``importlib.metadata``, incorporate changes from importlib_metadata 3.10:
Add mtime-based caching during distribution discovery. Flagged use of dict
result from ``entry_points()`` as deprecated.
..
.. gh-issue: 47383
.. date: 2021-04-08-19-32-26
.. nonce: YI1hdL
.. section: Library
The ``P.args`` and ``P.kwargs`` attributes of :class:`typing.ParamSpec` are
now instances of the new classes :class:`typing.ParamSpecArgs` and
:class:`typing.ParamSpecKwargs`, which enables a more useful ``repr()``.
Patch by Jelle Zijlstra.
..
.. bpo: 43731
.. date: 2021-04-08-15-19-20
.. nonce: nnVd3h
.. section: Library
Add an ``encoding`` parameter :func:`logging.fileConfig`.
..
.. bpo: 43712
.. date: 2021-04-08-12-25-08
.. nonce: f8WXCX
.. section: Library
Add ``encoding`` and ``errors`` parameters to :func:`fileinput.input` and
:class:`fileinput.FileInput`.
..
.. bpo: 38659
.. date: 2021-04-08-11-47-31
.. nonce: r_HFnU
.. section: Library
A ``simple_enum`` decorator is added to the ``enum`` module to convert a
normal class into an Enum. ``test_simple_enum`` added to test simple enums
against a corresponding normal Enum.  Standard library modules updated to
use ``simple_enum``.
..
.. bpo: 43764
.. date: 2021-04-08-09-59-20
.. nonce: tHjO60
.. section: Library
Fix an issue where :data:`~object.__match_args__` generation could fail for
some :mod:`dataclasses`.
..
.. bpo: 43752
.. date: 2021-04-06-21-18-29
.. nonce: K7qmAF
.. section: Library
Fix :mod:`sqlite3` regression for zero-sized blobs with converters, where
``b""`` was returned instead of ``None``. The regression was introduced by
PR 24723. Patch by Erlend E. Aasland.
..
.. bpo: 43655
.. date: 2021-04-04-20-51-19
.. nonce: LwGy8R
.. section: Library
:mod:`tkinter` dialog windows are now recognized as dialogs by window
managers on macOS and X Window.
..
.. bpo: 43723
.. date: 2021-04-03-18-03-44
.. nonce: uBhBZS
.. section: Library
The following ``threading`` methods are now deprecated and should be
replaced:
- ``currentThread`` => :func:`threading.current_thread`
- ``activeCount`` => :func:`threading.active_count`
- ``Condition.notifyAll`` => :meth:`threading.Condition.notify_all`
- ``Event.isSet`` => :meth:`threading.Event.is_set`
- ``Thread.setName`` => :attr:`threading.Thread.name`
- ``thread.getName`` => :attr:`threading.Thread.name`
- ``Thread.isDaemon`` => :attr:`threading.Thread.daemon`
- ``Thread.setDaemon`` => :attr:`threading.Thread.daemon`
Patch by Jelle Zijlstra.
..
.. bpo: 2135
.. date: 2021-04-03-15-24-59
.. nonce: xmDAYJ
.. section: Library
Deprecate find_module() and find_loader() implementations in importlib and
zipimport.
..
.. bpo: 43534
.. date: 2021-03-18-15-46-08
.. nonce: vPE9Us
.. section: Library
:func:`turtle.textinput` and :func:`turtle.numinput` create now a transient
window working on behalf of the canvas window.
..
.. bpo: 43532
.. date: 2021-03-17-19-06-45
.. nonce: W2Ntnm
.. section: Library
Add the ability to specify keyword-only fields to dataclasses.  These fields
will become keyword-only arguments to the generated __init__.
..
.. bpo: 43522
.. date: 2021-03-16-22-37-32
.. nonce: dhNwOu
.. section: Library
Fix problem with :attr:`~ssl.SSLContext.hostname_checks_common_name`.
OpenSSL does not copy hostflags from *struct SSL_CTX* to *struct SSL*.
..
.. bpo: 8978
.. date: 2021-03-13-14-02-07
.. nonce: CRxG-O
.. section: Library
Improve error message for :func:`tarfile.open` when :mod:`lzma` / :mod:`bz2`
are unavailable.  Patch by Anthony Sottile.
..
.. bpo: 42967
.. date: 2021-03-11-00-31-41
.. nonce: 2PeQRw
.. section: Library
Allow :class:`bytes` ``separator`` argument in ``urllib.parse.parse_qs`` and
``urllib.parse.parse_qsl`` when parsing :class:`str` query strings.
Previously, this raised a ``TypeError``.
..
.. bpo: 43296
.. date: 2021-03-01-13-01-33
.. nonce: p_gU6T
.. section: Library
Improve :mod:`sqlite3` error handling: ``sqlite3_value_blob()`` errors that
set ``SQLITE_NOMEM`` now raise :exc:`MemoryError`. Patch by Erlend E.
Aasland.
..
.. bpo: 43312
.. date: 2021-02-25-14-43-59
.. nonce: 6dg9_2
.. section: Library
New functions :func:`sysconfig.get_preferred_scheme` and
:func:`sysconfig.get_default_scheme` are added to query a platform for its
preferred "user", "home", and "prefix" (default) scheme names.
..
.. bpo: 43265
.. date: 2021-02-19-22-24-33
.. nonce: MyAzCH
.. section: Library
Improve :meth:`sqlite3.Connection.backup` error handling. The error message
for non-existent target database names is now ``unknown database <database
name>`` instead of ``SQL logic error``. Patch by Erlend E. Aasland.
..
.. bpo: 41282
.. date: 2021-02-16-13-18-38
.. nonce: GK9a0l
.. section: Library
Install schemes in ``distutils.command.install`` are now loaded from
:mod:`sysconfig`.
..
.. bpo: 41282
.. date: 2021-02-15-12-52-23
.. nonce: SenEje
.. section: Library
``distutils.sysconfig`` has been merged to :mod:`sysconfig`.
..
.. bpo: 43176
.. date: 2021-02-09-07-24-29
.. nonce: bocNQn
.. section: Library
Fixed processing of a dataclass that inherits from a frozen dataclass with
no fields.  It is now correctly detected as an error.
..
.. bpo: 43080
.. date: 2021-01-31-00-23-13
.. nonce: -fDg4Q
.. section: Library
:mod:`pprint` now has support for :class:`dataclasses.dataclass`. Patch by
Lewis Gaul.
..
.. bpo: 39950
.. date: 2021-01-22-00-15-37
.. nonce: NzLVaR
.. section: Library
Add ``pathlib.Path.hardlink_to()`` method that supersedes ``link_to()``. The new
method has the same argument order as ``symlink_to()``.
..
.. bpo: 42904
.. date: 2021-01-12-23-17-02
.. nonce: -4qkTD
.. section: Library
:func:`typing.get_type_hints` now checks the local namespace of a class when
evaluating :pep:`563` annotations inside said class.
..
.. bpo: 42269
.. date: 2021-01-08-22-32-13
.. nonce: W5v8z4
.. section: Library
Add ``slots`` parameter to ``dataclasses.dataclass`` decorator to
automatically generate ``__slots__`` for class. Patch provided by Yurii
Karabas.
..
.. bpo: 39529
.. date: 2020-12-06-20-21-16
.. nonce: 9Zrg43
.. section: Library
Deprecated use of :func:`asyncio.get_event_loop` without running event loop.
Emit deprecation warning for :mod:`asyncio` functions which implicitly
create a :class:`~asyncio.Future` or :class:`~asyncio.Task` objects if there
is no running event loop and no explicit *loop* argument is passed:
:func:`~asyncio.ensure_future`, :func:`~asyncio.wrap_future`,
:func:`~asyncio.gather`, :func:`~asyncio.shield`,
:func:`~asyncio.as_completed` and constructors of :class:`~asyncio.Future`,
:class:`~asyncio.Task`, :class:`~asyncio.StreamReader`,
:class:`~asyncio.StreamReaderProtocol`.
..
.. bpo: 18369
.. date: 2020-11-19-09-52-24
.. nonce: qzvYH2
.. section: Library
Certificate and PrivateKey classes were added to the ssl module.
Certificates and keys can now be loaded from memory buffer, too.
..
.. bpo: 41486
.. date: 2020-10-16-15-34-30
.. nonce: Mu9Iit
.. section: Library
Use a new output buffer management code for :mod:`bz2` / :mod:`lzma` /
:mod:`zlib` modules, and add ``.readall()`` function to
``_compression.DecompressReader`` class. These bring some performance
improvements. Patch by Ma Lin.
..
.. bpo: 31870
.. date: 2020-09-15-23-44-07
.. nonce: nVwd38
.. section: Library
The :func:`ssl.get_server_certificate` function now has a *timeout*
parameter.
..
.. bpo: 41735
.. date: 2020-09-07-11-15-15
.. nonce: NKqGKy
.. section: Library
Fix thread locks in zlib module may go wrong in rare case. Patch by Ma Lin.
..
.. bpo: 36470
.. date: 2020-06-13-23-33-32
.. nonce: oi6Kdb
.. section: Library
Fix dataclasses with ``InitVar``\s and :func:`~dataclasses.replace`. Patch
by Claudiu Popa.
..
.. bpo: 40849
.. date: 2020-06-02-21-32-33
.. nonce: zpeKx3
.. section: Library
Expose X509_V_FLAG_PARTIAL_CHAIN ssl flag
..
.. bpo: 35114
.. date: 2020-05-17-14-10-24
.. nonce: uLIHfn
.. section: Library
:func:`ssl.RAND_status` now returns a boolean value (as documented) instead
of ``1`` or ``0``.
..
.. bpo: 39906
.. date: 2020-03-30-00-13-27
.. nonce: eaR3fN
.. section: Library
:meth:`pathlib.Path.stat` and :meth:`~pathlib.Path.chmod` now accept a
*follow_symlinks* keyword-only argument for consistency with corresponding
functions in the :mod:`os` module.
..
.. bpo: 39899
.. date: 2020-03-09-20-36-07
.. nonce: 9adF3E
.. section: Library
:func:`os.path.expanduser` now refuses to guess Windows home directories
if the basename of current user's home directory does not match their
username.
:meth:`pathlib.Path.expanduser` and :meth:`~pathlib.Path.home` now
consistently raise :exc:`RuntimeError` exception when a home directory
cannot be resolved. Previously a :exc:`KeyError` exception could be raised
on Windows when the ``"USERNAME"``  environment variable was unset.
..
.. bpo: 36076
.. date: 2019-10-16-17-21-53
.. nonce: FGeQQT
.. section: Library
Added SNI support to :func:`ssl.get_server_certificate`.
..
.. bpo: 38490
.. date: 2019-10-16-08-08-14
.. nonce: QbDXEF
.. section: Library
Covariance, Pearson's correlation, and simple linear regression
functionality was added to statistics module. Patch by Tymoteusz Wołodźko.
..
.. bpo: 33731
.. date: 2019-08-14-13-19-50
.. nonce: 9esS0d
.. section: Library
Provide a locale.localize() function, which converts a normalized number
string into a locale format.
..
.. bpo: 32745
.. date: 2018-08-09-23-47-10
.. nonce: iQi9hI
.. section: Library
Fix a regression in the handling of ctypes' :data:`ctypes.c_wchar_p` type:
embedded null characters would cause a :exc:`ValueError` to be raised. Patch
by Zackery Spytz.
..
.. bpo: 43987
.. date: 2021-04-30-04-27-02
.. nonce: 1DftVa
.. section: Documentation
Add "Annotations Best Practices" document as a new HOWTO.
..
.. bpo: 43977
.. date: 2021-04-29-15-06-03
.. nonce: K5aSl1
.. section: Documentation
Document the new :c:macro:`Py_TPFLAGS_MAPPING` and
:c:macro:`Py_TPFLAGS_SEQUENCE` type flags.
..
.. bpo: 43959
.. date: 2021-04-27-22-22-22
.. nonce: n2261q
.. section: Documentation
The documentation on the PyContextVar C-API was clarified.
..
.. bpo: 43938
.. date: 2021-04-25-22-44-27
.. nonce: nC660q
.. section: Documentation
Update dataclasses documentation to express that FrozenInstanceError is
derived from AttributeError.
..
.. bpo: 43778
.. date: 2021-04-08-22-42-02
.. nonce: MszRnY
.. section: Documentation
Fix the Sphinx glossary_search extension: create the _static/ sub-directory
if it doesn't exist.
..
.. bpo: 43755
.. date: 2021-04-06-14-55-45
.. nonce: 1m0fGq
.. section: Documentation
Update documentation to reflect that unparenthesized lambda expressions can
no longer be the expression part in an ``if`` clause in comprehensions and
generator expressions since Python 3.9.
..
.. bpo: 43739
.. date: 2021-04-06-07-05-49
.. nonce: L4HjiX
.. section: Documentation
Fixing the example code in Doc/extending/extending.rst to declare and
initialize the pmodule variable to be of the right type.
..
.. bpo: 43961
.. date: 2021-04-28-13-21-52
.. nonce: gNchls
.. section: Tests
Fix test_logging.test_namer_rotator_inheritance() on Windows: use
:func:`os.replace` rather than :func:`os.rename`. Patch by Victor Stinner.
..
.. bpo: 43842
.. date: 2021-04-16-14-07-40
.. nonce: w60GAH
.. section: Tests
Fix a race condition in the SMTP test of test_logging. Don't close a file
descriptor (socket) from a different thread while asyncore.loop() is polling
the file descriptor. Patch by Victor Stinner.
..
.. bpo: 43843
.. date: 2021-04-14-13-22-44
.. nonce: ruIQKD
.. section: Tests
:mod:`test.libregrtest` now marks a test as ENV_CHANGED (altered the
execution environment) if a thread raises an exception but does not catch
it. It sets a hook on :func:`threading.excepthook`. Use
``--fail-env-changed`` option to mark the test as failed. Patch by Victor
Stinner.
..
.. bpo: 43811
.. date: 2021-04-12-11-14-28
.. nonce: vGNbnD
.. section: Tests
Tests multiple OpenSSL versions on GitHub Actions. Use ccache to speed up
testing.
..
.. bpo: 43791
.. date: 2021-04-09-15-10-38
.. nonce: 4KxiXK
.. section: Tests
OpenSSL 3.0.0: Disable testing of legacy protocols TLS 1.0 and 1.1. Tests
are failing with TLSV1_ALERT_INTERNAL_ERROR.
..
.. bpo: 43567
.. date: 2021-03-31-19-50-01
.. nonce: vd0a-p
.. section: Build
Improved generated code refresh (AST/tokens/opcodes/keywords) on Windows.
..
.. bpo: 43669
.. date: 2021-03-30-14-19-39
.. nonce: lWMUYx
.. section: Build
Implement :pep:`644`. Python now requires OpenSSL 1.1.1 or newer.
..
.. bpo: 35306
.. date: 2021-04-22-21-37-41
.. nonce: 10kSR-
.. section: Windows
Adds additional arguments to :func:`os.startfile` function.
..
.. bpo: 43538
.. date: 2021-04-22-20-39-49
.. nonce: F0Cg6X
.. section: Windows
Avoid raising errors from :meth:`pathlib.Path.exists` when passed an
invalid filename.
..
.. bpo: 38822
.. date: 2021-04-22-19-49-20
.. nonce: jgdPmq
.. section: Windows
Fixed :func:`os.stat` failing on inaccessible directories with a trailing
slash, rather than falling back to the parent directory's metadata. This
implicitly affected :func:`os.path.exists` and :func:`os.path.isdir`.
..
.. bpo: 26227
.. date: 2021-04-21-23-37-34
.. nonce: QMY_eA
.. section: Windows
Fixed decoding of host names in :func:`socket.gethostbyaddr` and
:func:`socket.gethostbyname_ex`.
..
.. bpo: 40432
.. date: 2021-04-20-23-07-22
.. nonce: 9OFpoq
.. section: Windows
Updated pegen regeneration script on Windows to find and use Python 3.8 or
higher.  Prior to this, pegen regeneration already required 3.8 or higher,
but the script may have used lower versions of Python.
..
.. bpo: 43745
.. date: 2021-04-06-12-27-33
.. nonce: rdKNda
.. section: Windows
Actually updates Windows release to OpenSSL 1.1.1k. Earlier releases were
mislabelled and actually included 1.1.1i again.
..
.. bpo: 43652
.. date: 2021-04-03-18-54-31
.. nonce: gNmfVN
.. section: Windows
Update Tcl and Tk to 8.6.11 in Windows installer.
..
.. bpo: 43492
.. date: 2021-03-15-11-34-33
.. nonce: AsYnVX
.. section: Windows
Upgrade Windows installer to use SQLite 3.35.5.
..
.. bpo: 30555
.. date: 2017-12-16-12-23-51
.. nonce: 3ybjly
.. section: Windows
Fix ``WindowsConsoleIO`` errors in the presence of fd redirection. Patch by
Segev Finer.
..
.. bpo: 42119
.. date: 2021-05-02-21-03-27
.. nonce: Y7BSX_
.. section: macOS
Fix check for macOS SDK paths when building Python. Narrow search to match
contents of SDKs, namely only files in ``/System/Library``,
``/System/IOSSupport``, and ``/usr`` other than ``/usr/local``. Previously,
anything under ``/System`` was assumed to be in an SDK which causes problems
with the new file system layout in 10.15+ where user file systems may appear
to be mounted under ``/System``.  Paths in ``/Library`` were also
incorrectly treated as SDK locations.
..
.. bpo: 43568
.. date: 2021-05-02-19-50-52
.. nonce: AeLNBd
.. section: macOS
Drop support for MACOSX_DEPLOYMENT_TARGET < 10.3
..
.. bpo: 44009
.. date: 2021-05-02-03-45-30
.. nonce: uvhmlh
.. section: macOS
Provide "python3.x-intel64" executable to allow reliably forcing macOS
universal2 framework builds to run under Rosetta 2 Intel-64 emulation on
Apple Silicon Macs.  This can be useful for testing or when universal2
wheels are not yet available.
..
.. bpo: 43851
.. date: 2021-04-15-01-20-45
.. nonce: sDI60Y
.. section: macOS
Build SQLite with ``SQLITE_OMIT_AUTOINIT`` on macOS. Patch by Erlend E.
Aasland.
..
.. bpo: 43492
.. date: 2021-03-15-11-32-23
.. nonce: 1ZRcV9
.. section: macOS
Update macOS installer to use SQLite 3.35.4.
..
.. bpo: 42235
.. date: 2020-11-01-17-37-16
.. nonce: A97_BN
.. section: macOS
``Mac/BuildScript/build-installer.py`` will now use "--enable-optimizations"
and ``--with-lto`` when building on macOS 10.15 or later.
..
.. bpo: 37903
.. date: 2021-05-02-20-25-53
.. nonce: VQ6VTU
.. section: IDLE
Add mouse actions to the shell sidebar.  Left click and optional drag
selects one or more lines, as with the editor line number sidebar.  Right
click after selecting raises a context menu with 'copy with prompts'.  This
zips together prompts from the sidebar with lines from the selected text.
..
.. bpo: 43981
.. date: 2021-04-30-17-59-56
.. nonce: 3EFl1H
.. section: IDLE
Fix reference leak in test_sidebar and test_squeezer.
Patches by Terry Jan Reedy and Pablo Galindo
..
.. bpo: 37892
.. date: 2021-04-29-02-40-41
.. nonce: bgW2fk
.. section: IDLE
Indent IDLE Shell input with spaces instead of tabs
..
.. bpo: 43655
.. date: 2021-04-04-20-52-07
.. nonce: HSyaKH
.. section: IDLE
IDLE dialog windows are now recognized as dialogs by window managers on
macOS and X Window.
..
.. bpo: 37903
.. date: 2019-08-24-23-49-36
.. nonce: 4xjast
.. section: IDLE
IDLE's shell now shows prompts in a separate side-bar.
..
.. bpo: 43916
.. date: 2021-04-29-17-35-48
.. nonce: wvWt23
.. section: C API
Add a new :c:macro:`Py_TPFLAGS_DISALLOW_INSTANTIATION` type flag to disallow
creating type instances. Patch by Victor Stinner.
..
.. bpo: 43774
.. date: 2021-04-29-10-17-21
.. nonce: 5MGfgN
.. section: C API
Remove the now unused ``PYMALLOC_DEBUG`` macro. Debug hooks on memory
allocators are now installed by default if Python is built in debug mode (if
``Py_DEBUG`` macro is defined). Moreover, they can now be used on Python
build in release mode (ex: using ``PYTHONMALLOC=debug`` environment
variable).
..
.. bpo: 43962
.. date: 2021-04-28-13-13-07
.. nonce: 9Jzs5X
.. section: C API
_PyInterpreterState_IDIncref() now calls _PyInterpreterState_IDInitref() and
always increments id_refcount. Previously, calling
_xxsubinterpreters.get_current() could create an id_refcount inconsistency
when a _xxsubinterpreters.InterpreterID object was deallocated. Patch by
Victor Stinner.
..
.. bpo: 28254
.. date: 2021-04-28-12-33-44
.. nonce: a2561e
.. section: C API
Add new C-API functions to control the state of the garbage collector:
:c:func:`PyGC_Enable()`, :c:func:`PyGC_Disable()`,
:c:func:`PyGC_IsEnabled()`, corresponding to the functions in the :mod:`gc`
module.
..
.. bpo: 43908
.. date: 2021-04-22-10-46-40
.. nonce: Co3YhZ
.. section: C API
Introduce :c:macro:`Py_TPFLAGS_IMMUTABLETYPE` flag for immutable type objects,
and modify :c:func:`PyType_Ready` to set it for static types. Patch by
Erlend E. Aasland.
..
.. bpo: 43795
.. date: 2021-04-20-15-06-29
.. nonce: y0IP4c
.. section: C API
:c:func:`PyMem_Calloc` is now available in the limited C API
(``Py_LIMITED_API``).
..
.. bpo: 43868
.. date: 2021-04-16-18-15-56
.. nonce: twQ7KH
.. section: C API
:c:func:`PyOS_ReadlineFunctionPointer` is no longer exported by limited C
API headers and by ``python3.dll`` on Windows. Like any function that takes
``FILE*``, it is not part of the stable ABI.
..
.. bpo: 43795
.. date: 2021-04-09-18-19-07
.. nonce: l0yobT
.. section: C API
Stable ABI and limited API definitions are generated from a central manifest
(:pep:`652`).
..
.. bpo: 43753
.. date: 2021-04-06-20-52-44
.. nonce: xUsHp1
.. section: C API
Add the :c:func:`Py_Is(x, y) <Py_Is>` function to test if the *x* object is
the *y* object, the same as ``x is y`` in Python. Add also the
:c:func:`Py_IsNone`, :c:func:`Py_IsTrue`, :c:func:`Py_IsFalse` functions to
test if an object is, respectively, the ``None`` singleton, the ``True``
singleton or the ``False`` singleton. Patch by Victor Stinner.

.. bpo: 38722
.. date: 2019-11-18-16-17-56
.. nonce: x3mECW
.. release date: 2019-11-19
.. section: Security
:mod:`runpy` now uses :meth:`io.open_code` to open code files. Patch by
Jason Killen.
..
.. bpo: 38622
.. date: 2019-11-14-16-13-23
.. nonce: 3DYkfb
.. section: Security
Add additional audit events for the :mod:`ctypes` module.
..
.. bpo: 38418
.. date: 2019-10-08-19-29-55
.. nonce: QL7s0-
.. section: Security
Fixes audit event for :func:`os.system` to be named ``os.system``.
..
.. bpo: 38243
.. date: 2019-09-25-13-21-09
.. nonce: 1pfz24
.. section: Security
Escape the server title of :class:`xmlrpc.server.DocXMLRPCServer` when
rendering the document page as HTML. (Contributed by Donghee Na in
:issue:`38243`.)
..
.. bpo: 38174
.. date: 2019-09-23-21-02-46
.. nonce: MeWuJd
.. section: Security
Update vendorized expat library version to 2.2.8, which resolves
:cve:`2019-15903`.
..
.. bpo: 37764
.. date: 2019-08-27-01-13-05
.. nonce: qv67PQ
.. section: Security
Fixes email._header_value_parser.get_unstructured going into an infinite
loop for a specific case in which the email header does not have trailing
whitespace, and the case in which it contains an invalid encoded word. Patch
by Ashwin Ramaswami.
..
.. bpo: 37461
.. date: 2019-07-16-08-11-00
.. nonce: 1Ahz7O
.. section: Security
Fix an infinite loop when parsing specially crafted email headers. Patch by
Abhilash Raj.
..
.. bpo: 37363
.. date: 2019-07-01-10-31-14
.. nonce: fSjatj
.. section: Security
Adds audit events for the range of supported run commands (see
:ref:`using-on-general`).
..
.. bpo: 37463
.. date: 2019-07-01-08-46-14
.. nonce: 1CHwjE
.. section: Security
ssl.match_hostname() no longer accepts IPv4 addresses with additional text
after the address and only quad-dotted notation without trailing
whitespaces. Some inet_aton() implementations ignore whitespace and all data
after whitespace, e.g. '127.0.0.1 whatever'.
..
.. bpo: 37363
.. date: 2019-06-21-15-58-59
.. nonce: diouyl
.. section: Security
Adds audit events for :mod:`ensurepip`, :mod:`ftplib`, :mod:`glob`,
:mod:`imaplib`, :mod:`!nntplib`, :mod:`pdb`, :mod:`poplib`, :mod:`shutil`,
:mod:`smtplib`, :mod:`sqlite3`, :mod:`subprocess`, :mod:`!telnetlib`,
:mod:`tempfile` and :mod:`webbrowser`, as well as :func:`os.listdir`,
:func:`os.scandir` and :func:`breakpoint`.
..
.. bpo: 37364
.. date: 2019-06-21-14-42-53
.. nonce: IIRc2s
.. section: Security
:func:`io.open_code` is now used when reading :file:`.pth` files.
..
.. bpo: 34631
.. date: 2019-06-17-09-34-25
.. nonce: DBfM4j
.. section: Security
Updated OpenSSL to 1.1.1c in Windows installer
..
.. bpo: 34155
.. date: 2019-05-04-13-33-37
.. nonce: MJll68
.. section: Security
Fix parsing of invalid email addresses with more than one ``@`` (e.g.
a@b@c.com.) to not return the part before 2nd ``@`` as valid email address.
Patch by maxking & jpic.
..
.. bpo: 38631
.. date: 2019-11-18-17-10-20
.. nonce: tRHaAk
.. section: Core and Builtins
Replace ``Py_FatalError()`` call with a regular :exc:`RuntimeError`
exception in :meth:`float.__getformat__`.
..
.. bpo: 38639
.. date: 2019-10-30-11-31-47
.. nonce: 9-vKtO
.. section: Core and Builtins
Optimized :func:`math.floor`, :func:`math.ceil` and :func:`math.trunc`
for floats.
..
.. bpo: 38640
.. date: 2019-10-30-11-25-25
.. nonce: 4sAFh5
.. section: Core and Builtins
Fixed a bug in the compiler that was causing to raise in the presence of
break statements and continue statements inside always false while loops.
Patch by Pablo Galindo.
..
.. bpo: 38613
.. date: 2019-10-29-15-44-24
.. nonce: V_R3NC
.. section: Core and Builtins
Optimized some set operations (e.g. ``|``, ``^``, and ``-``) of
``dict_keys``. ``d.keys() | other`` was slower than ``set(d) | other`` but
they are almost same performance for now.
..
.. bpo: 28029
.. date: 2019-10-29-09-38-54
.. nonce: AmRMEF
.. section: Core and Builtins
``"".replace("", s, n)`` now returns ``s`` instead of an empty string for
all non-zero ``n``.  There are similar changes for :class:`bytes` and
:class:`bytearray` objects.
..
.. bpo: 38535
.. date: 2019-10-20-12-43-48
.. nonce: ESMkVN
.. section: Core and Builtins
Fixed line numbers and column offsets for AST nodes for calls without
arguments in decorators.
..
.. bpo: 38525
.. date: 2019-10-20-00-36-18
.. nonce: Vty1cA
.. section: Core and Builtins
Fix a segmentation fault when using reverse iterators of empty ``dict``
objects. Patch by Donghee Na and Inada Naoki.
..
.. bpo: 38465
.. date: 2019-10-19-12-44-13
.. nonce: V1L8c4
.. section: Core and Builtins
:class:`bytearray`, :class:`~array.array` and :class:`~mmap.mmap` objects
allow now to export more than ``2**31`` buffers at a time.
..
.. bpo: 38469
.. date: 2019-10-13-23-41-38
.. nonce: 9kmuQj
.. section: Core and Builtins
Fixed a bug where the scope of named expressions was not being resolved
correctly in the presence of the *global* keyword. Patch by Pablo Galindo.
..
.. bpo: 38437
.. date: 2019-10-10-20-42-09
.. nonce: z_0mZp
.. section: Core and Builtins
Activate the ``GC_DEBUG`` macro for debug builds of the interpreter (when
``Py_DEBUG`` is set). Patch by Pablo Galindo.
..
.. bpo: 38379
.. date: 2019-10-10-01-41-02
.. nonce: _q4dhn
.. section: Core and Builtins
When the garbage collector makes a collection in which some objects
resurrect (they are reachable from outside the isolated cycles after the
finalizers have been executed), do not block the collection of all objects
that are still unreachable. Patch by Pablo Galindo and Tim Peters.
..
.. bpo: 38379
.. date: 2019-10-09-16-50-52
.. nonce: oz5qZx
.. section: Core and Builtins
When cyclic garbage collection (gc) runs finalizers that resurrect
unreachable objects, the current gc run ends, without collecting any cyclic
trash.  However, the statistics reported by ``collect()`` and
``get_stats()`` claimed that all cyclic trash found was collected, and that
the resurrected objects were collected.   Changed the stats to report that
none were collected.
..
.. bpo: 38392
.. date: 2019-10-07-22-51-39
.. nonce: KaXXps
.. section: Core and Builtins
In debug mode, :c:func:`PyObject_GC_Track` now calls ``tp_traverse()`` of
the object type to ensure that the object is valid: test that objects
visited by ``tp_traverse()`` are valid.
..
.. bpo: 38210
.. date: 2019-10-06-15-01-57
.. nonce: Xgc6F_
.. section: Core and Builtins
Remove unnecessary intersection and update set operation in dictview with
empty set. (Contributed by Donghee Na in :issue:`38210`.)
..
.. bpo: 38402
.. date: 2019-10-05-19-36-16
.. nonce: EZuzgK
.. section: Core and Builtins
Check the error from the system's underlying ``crypt`` or ``crypt_r``.
..
.. bpo: 37474
.. date: 2019-10-01-12-46-30
.. nonce: cB3se1
.. section: Core and Builtins
On FreeBSD, Python no longer calls ``fedisableexcept()`` at startup to
control the floating-point control mode. The call became useless since
FreeBSD 6: it became the default mode.
..
.. bpo: 38006
.. date: 2019-09-30-09-33-21
.. nonce: UYlJum
.. section: Core and Builtins
Fix a bug due to the interaction of weakrefs and the cyclic garbage
collector. We must clear any weakrefs in garbage in order to prevent their
callbacks from executing and causing a crash.
..
.. bpo: 38317
.. date: 2019-09-30-00-56-21
.. nonce: pmqlIQ
.. section: Core and Builtins
Fix warnings options priority: ``PyConfig.warnoptions`` has the highest
priority, as stated in the :pep:`587`.
..
.. bpo: 38310
.. date: 2019-09-28-22-54-25
.. nonce: YDTbEo
.. section: Core and Builtins
Predict ``BUILD_MAP_UNPACK_WITH_CALL`` -> ``CALL_FUNCTION_EX`` opcode pairs
in the main interpreter loop. Patch by Brandt Bucher.
..
.. bpo: 36871
.. date: 2019-09-24-18-45-46
.. nonce: p47knk
.. section: Core and Builtins
Improve error handling for the assert_has_calls and assert_has_awaits
methods of mocks. Fixed a bug where any errors encountered while binding the
expected calls to the mock's spec were silently swallowed, leading to
misleading error output.
..
.. bpo: 11410
.. date: 2019-09-24-05-32-27
.. nonce: vS182p
.. section: Core and Builtins
Better control over symbol visibility is provided through use of the
visibility attributes available in gcc >= 4.0, provided in a uniform way
across POSIX and Windows. The POSIX build files have been updated to compile
with -fvisibility=hidden, minimising exported symbols.
..
.. bpo: 38219
.. date: 2019-09-22-13-56-18
.. nonce: rFl7JD
.. section: Core and Builtins
Optimized the :class:`dict` constructor and the :meth:`~dict.update` method
for the case when the argument is a dict.
..
.. bpo: 38236
.. date: 2019-09-20-19-06-23
.. nonce: eQ0Tmj
.. section: Core and Builtins
Python now dumps path configuration if it fails to import the Python codecs
of the filesystem and stdio encodings.
..
.. bpo: 38013
.. date: 2019-09-12-19-50-01
.. nonce: I7btD0
.. section: Core and Builtins
Allow to call ``async_generator_athrow().throw(...)`` even for non-started
async generator helper. It fixes annoying warning at the end of
:func:`asyncio.run` call.
..
.. bpo: 38124
.. date: 2019-09-12-00-14-01
.. nonce: n6E0H7
.. section: Core and Builtins
Fix an off-by-one error in PyState_AddModule that could cause out-of-bounds
memory access.
..
.. bpo: 38116
.. date: 2019-09-11-14-49-42
.. nonce: KDwmwt
.. section: Core and Builtins
The select module is now PEP-384 compliant and no longer has static state
..
.. bpo: 38113
.. date: 2019-09-11-14-10-02
.. nonce: yZXC3P
.. section: Core and Builtins
ast module updated to PEP-384 and all statics removed
..
.. bpo: 38076
.. date: 2019-09-09-16-36-37
.. nonce: C5dVBl
.. section: Core and Builtins
The struct module is now PEP-384 compatible
..
.. bpo: 38075
.. date: 2019-09-09-15-59-50
.. nonce: N8OZKF
.. section: Core and Builtins
The random module is now PEP-384 compatible
..
.. bpo: 38074
.. date: 2019-09-09-15-40-57
.. nonce: MsVbeI
.. section: Core and Builtins
zlib module made PEP-384 compatible
..
.. bpo: 38073
.. date: 2019-09-09-15-17-58
.. nonce: ZoKYOU
.. section: Core and Builtins
Make pwd extension module PEP-384 compatible
..
.. bpo: 38072
.. date: 2019-09-09-15-00-42
.. nonce: Y1xpDO
.. section: Core and Builtins
grp module made PEP-384 compatible
..
.. bpo: 38069
.. date: 2019-09-09-14-46-05
.. nonce: cn8XLv
.. section: Core and Builtins
Make _posixsubprocess PEP-384 compatible
..
.. bpo: 38071
.. date: 2019-09-09-14-44-17
.. nonce: bLwkBJ
.. section: Core and Builtins
Make termios extension module PEP-384 compatible
..
.. bpo: 38005
.. date: 2019-09-02-20-00-31
.. nonce: e7VsTA
.. section: Core and Builtins
Fixed comparing and creating of InterpreterID and ChannelID.
..
.. bpo: 36946
.. date: 2019-09-02-16-17-42
.. nonce: _lAuSR
.. section: Core and Builtins
Fix possible signed integer overflow when handling slices. Patch by
hongweipeng.
..
.. bpo: 37994
.. date: 2019-08-31-11-13-25
.. nonce: Rj6S4j
.. section: Core and Builtins
Fixed silencing arbitrary errors if an attribute lookup fails in several
sites. Only AttributeError should be silenced.
..
.. bpo: 8425
.. date: 2019-08-29-01-55-38
.. nonce: FTq4A8
.. section: Core and Builtins
Optimize set difference_update for the case when the other set is much
larger than the base set.  (Suggested by Evgeny Kapun with code contributed
by Michele Orrù).
..
.. bpo: 37966
.. date: 2019-08-27-21-21-36
.. nonce: 5OBLez
.. section: Core and Builtins
The implementation of :func:`~unicodedata.is_normalized` has been greatly
sped up on strings that aren't normalized, by implementing the full
normalization-quick-check algorithm from the Unicode standard.
..
.. bpo: 37947
.. date: 2019-08-26-04-09-57
.. nonce: mzAQtB
.. section: Core and Builtins
Adjust correctly the recursion level in the symtable generation for named
expressions. Patch by Pablo Galindo.
..
.. bpo: 37812
.. date: 2019-08-23-22-46-25
.. nonce: vsWZwS
.. section: Core and Builtins
The ``CHECK_SMALL_INT`` macro used inside :file:`Object/longobject.c` has
been replaced with an explicit ``return`` at each call site.
..
.. bpo: 37751
.. date: 2019-08-20-04-36-37
.. nonce: CSFzUd
.. section: Core and Builtins
Fix :func:`codecs.lookup` to normalize the encoding name the same way than
:func:`encodings.normalize_encoding`, except that :func:`codecs.lookup` also
converts the name to lower case.
..
.. bpo: 37830
.. date: 2019-08-17-18-41-59
.. nonce: fNfMbz
.. section: Core and Builtins
Fixed compilation of :keyword:`break` and :keyword:`continue` in the
:keyword:`finally` block when the corresponding :keyword:`try` block
contains :keyword:`return` with a non-constant value.
..
.. bpo: 20490
.. date: 2019-08-15-12-48-36
.. nonce: -hXeEn
.. section: Core and Builtins
Improve import error message for partially initialized module on circular
``from`` imports - by Anthony Sottile.
..
.. bpo: 37840
.. date: 2019-08-13-18-05-20
.. nonce: elLCci
.. section: Core and Builtins
Fix handling of negative indices in :c:member:`~PySequenceMethods.sq_item`
of :class:`bytearray`. Patch by Sergey Fedoseev.
..
.. bpo: 37802
.. date: 2019-08-09-18-28-57
.. nonce: pKxcAW
.. section: Core and Builtins
Slightly improve performance of :c:func:`PyLong_FromUnsignedLong`,
:c:func:`PyLong_FromUnsignedLongLong` and :c:func:`PyLong_FromSize_t`. Patch
by Sergey Fedoseev.
..
.. bpo: 37409
.. date: 2019-08-06-23-39-05
.. nonce: 1qwzn2
.. section: Core and Builtins
Ensure explicit relative imports from interactive sessions and scripts
(having no parent package) always raise ImportError, rather than treating
the current module as the package. Patch by Ben Lewis.
..
.. bpo: 32912
.. date: 2019-08-06-14-03-59
.. nonce: UDwSMJ
.. section: Core and Builtins
Reverted :issue:`32912`: emitting :exc:`SyntaxWarning` instead of
:exc:`DeprecationWarning` for invalid escape sequences in string and bytes
literals.
..
.. bpo: 37757
.. date: 2019-08-05-14-22-59
.. nonce: lRv5HX
.. section: Core and Builtins
:pep:`572`: As described in the PEP, assignment expressions now raise
:exc:`SyntaxError` when their interaction with comprehension scoping results
in an ambiguous target scope.
The ``TargetScopeError`` subclass originally proposed by the PEP has been
removed in favour of just raising regular syntax errors for the disallowed
cases.
..
.. bpo: 36279
.. date: 2019-08-04-12-24-18
.. nonce: 8Zy7jZ
.. section: Core and Builtins
Fix potential use of uninitialized memory in :func:`os.wait3`.
..
.. bpo: 36311
.. date: 2019-08-02-15-01-33
.. nonce: uY5vt-
.. section: Core and Builtins
Decoding bytes objects larger than 2GiB is faster and no longer fails when a
multibyte characters spans a chunk boundary.
..
.. bpo: 34880
.. date: 2019-08-01-10-45-51
.. nonce: u_x_CG
.. section: Core and Builtins
The :keyword:`assert` statement now works properly if the
:exc:`AssertionError` exception is being shadowed. Patch by Zackery Spytz.
..
.. bpo: 37340
.. date: 2019-07-25-11-06-57
.. nonce: 5ktLEg
.. section: Core and Builtins
Removed object cache (``free_list``) for bound method objects.  Temporary
bound method objects are less used than before thanks to the ``LOAD_METHOD``
opcode and the ``_PyObject_VectorcallMethod`` C API.
..
.. bpo: 37648
.. date: 2019-07-22-11-05-05
.. nonce: 6TY2L-
.. section: Core and Builtins
Fixed minor inconsistency in :meth:`list.__contains__`,
:meth:`tuple.__contains__` and a few other places. The collection's item is
now always at the left and the needle is on the right of ``==``.
..
.. bpo: 37444
.. date: 2019-07-20-22-34-42
.. nonce: UOd3Xs
.. section: Core and Builtins
Update differing exception between :meth:`builtins.__import__` and
:meth:`importlib.__import__`.
..
.. bpo: 37619
.. date: 2019-07-18-11-50-49
.. nonce: X6Lulo
.. section: Core and Builtins
When adding a wrapper descriptor from one class to a different class (for
example, setting ``__add__ = str.__add__`` on an ``int`` subclass), an
exception is correctly raised when the operator is called.
..
.. bpo: 37593
.. date: 2019-07-14-23-57-27
.. nonce: yHSTwH
.. section: Core and Builtins
Swap the positions of the *posonlyargs* and *args* parameters in the
constructor of :class:`ast.parameters` nodes.
..
.. bpo: 37543
.. date: 2019-07-10-20-33-53
.. nonce: EvI19D
.. section: Core and Builtins
Optimized pymalloc for non PGO build.
..
.. bpo: 37537
.. date: 2019-07-10-09-56-47
.. nonce: OkB0wd
.. section: Core and Builtins
Compute allocated pymalloc blocks inside _Py_GetAllocatedBlocks().  This
slows down _Py_GetAllocatedBlocks() but gives a small speedup to
_PyObject_Malloc() and _PyObject_Free().
..
.. bpo: 37467
.. date: 2019-07-01-12-22-44
.. nonce: u-XyEu
.. section: Core and Builtins
Fix :func:`sys.excepthook` and :c:func:`PyErr_Display` if a filename is a
bytes string. For example, for a SyntaxError exception where the filename
attribute is a bytes string.
..
.. bpo: 37433
.. date: 2019-06-27-15-01-14
.. nonce: amNGqr
.. section: Core and Builtins
Fix ``SyntaxError`` indicator printing too many spaces for multi-line
strings - by Anthony Sottile.
..
.. bpo: 37417
.. date: 2019-06-26-18-41-00
.. nonce: VsZeHL
.. section: Core and Builtins
:meth:`bytearray.extend` now correctly handles errors that arise during
iteration. Patch by Brandt Bucher.
..
.. bpo: 37414
.. date: 2019-06-26-17-27-26
.. nonce: o6Lnbc
.. section: Core and Builtins
The undocumented ``sys.callstats()`` function has been removed. Since Python
3.7, it was deprecated and always returned ``None``. It required a special
build option ``CALL_PROFILE`` which was already removed in Python 3.7.
..
.. bpo: 37392
.. date: 2019-06-25-01-45-06
.. nonce: J3JhIx
.. section: Core and Builtins
Remove ``sys.getcheckinterval()`` and ``sys.setcheckinterval()`` functions.
They were deprecated since Python 3.2. Use :func:`sys.getswitchinterval` and
:func:`sys.setswitchinterval` instead. Remove also ``check_interval`` field
of the ``PyInterpreterState`` structure.
..
.. bpo: 37388
.. date: 2019-06-24-21-53-52
.. nonce: 0XTZmW
.. section: Core and Builtins
In development mode and in debug build, *encoding* and *errors* arguments
are now checked on string encoding and decoding operations. Examples:
:func:`open`, :meth:`str.encode` and :meth:`bytes.decode`.
By default, for best performances, the *errors* argument is only checked at
the first encoding/decoding error, and the *encoding* argument is sometimes
ignored for empty strings.
..
.. bpo: 37348
.. date: 2019-06-23-00-26-30
.. nonce: pp8P-x
.. section: Core and Builtins
Optimized decoding short ASCII string with UTF-8 and ascii codecs.
``b"foo".decode()`` is about 15% faster.  Patch by Inada Naoki.
..
.. bpo: 24214
.. date: 2019-06-22-12-45-20
.. nonce: hIiHeD
.. section: Core and Builtins
Improved support of the surrogatepass error handler in the UTF-8 and UTF-16
incremental decoders.
..
.. bpo: 37330
.. date: 2019-06-18-17-53-06
.. nonce: wAvHmz
.. section: Core and Builtins
:func:`open`, :func:`io.open`, :func:`codecs.open` and
:class:`fileinput.FileInput` no longer accept ``'U'`` ("universal newline")
in the file mode. This flag was deprecated since Python 3.3.
..
.. bpo: 35224
.. date: 2019-06-17-06-03-55
.. nonce: FHWPGv
.. section: Core and Builtins
Reverse evaluation order of key: value in dict comprehensions as proposed in
PEP 572. I.e. in ``{k: v for ...}``, ``k`` will be evaluated before ``v``.
..
.. bpo: 37316
.. date: 2019-06-17-03-53-16
.. nonce: LytDX_
.. section: Core and Builtins
Fix the :c:func:`PySys_Audit` call in :class:`mmap.mmap`.
..
.. bpo: 37300
.. date: 2019-06-16-02-38-25
.. nonce: WJkgKV
.. section: Core and Builtins
Remove an unnecessary Py_XINCREF in classobject.c.
..
.. bpo: 37269
.. date: 2019-06-14-06-32-33
.. nonce: SjVVAe
.. section: Core and Builtins
Fix a bug in the peephole optimizer that was not treating correctly constant
conditions with binary operators. Patch by Pablo Galindo.
..
.. bpo: 20443
.. date: 2019-06-13-12-55-38
.. nonce: bQWAxg
.. section: Core and Builtins
Python now gets the absolute path of the script filename specified on the
command line (ex: "python3 script.py"): the __file__ attribute of the
__main__ module and sys.path[0] become an absolute path, rather than a
relative path.
..
.. bpo: 37257
.. date: 2019-06-13-02-27-12
.. nonce: IMxDvT
.. section: Core and Builtins
Python's small object allocator (``obmalloc.c``) now allows (no more than)
one empty arena to remain available for immediate reuse, without returning
it to the OS.  This prevents thrashing in simple loops where an arena could
be created and destroyed anew on each iteration.
..
.. bpo: 37231
.. date: 2019-06-12-14-39-16
.. nonce: LF41Es
.. section: Core and Builtins
The dispatching of type slots to special methods (for example calling
``__mul__`` when doing ``x * y``) has been made faster.
..
.. bpo: 36974
.. date: 2019-06-11-12-59-38
.. nonce: bVYmSA
.. section: Core and Builtins
Implemented separate vectorcall functions for every calling convention of
builtin functions and methods. This improves performance for calls.
..
.. bpo: 37213
.. date: 2019-06-11-11-15-19
.. nonce: UPii5K
.. section: Core and Builtins
Handle correctly negative line offsets in the peephole optimizer. Patch by
Pablo Galindo.
..
.. bpo: 37219
.. date: 2019-06-10-23-18-31
.. nonce: jPSufq
.. section: Core and Builtins
Remove erroneous optimization for empty set differences.
..
.. bpo: 15913
.. date: 2019-06-06-20-52-38
.. nonce: 5Sg5cv
.. section: Core and Builtins
Implement :c:func:`PyBuffer_SizeFromFormat()` function (previously
documented but not implemented): call :func:`struct.calcsize`. Patch by
Joannah Nanjekye.
..
.. bpo: 36922
.. date: 2019-06-06-13-59-52
.. nonce: EMZ3TF
.. section: Core and Builtins
Slot functions optimize any callable with ``Py_TPFLAGS_METHOD_DESCRIPTOR``
instead of only instances of ``function``.
..
.. bpo: 36974
.. date: 2019-06-06-11-00-55
.. nonce: wdzzym
.. section: Core and Builtins
The slot ``tp_vectorcall_offset`` is inherited unconditionally to support
``super().__call__()`` when the base class uses vectorcall.
..
.. bpo: 37160
.. date: 2019-06-05-09-24-17
.. nonce: O3IAY3
.. section: Core and Builtins
:func:`threading.get_native_id` now also supports NetBSD.
..
.. bpo: 37077
.. date: 2019-05-28-11-47-44
.. nonce: S1h0Fc
.. section: Core and Builtins
Add :func:`threading.get_native_id` support for AIX. Patch by M. Felt
..
.. bpo: 36781
.. date: 2019-05-06-09-59-31
.. nonce: uocWt6
.. section: Core and Builtins
:func:`sum` has been optimized for boolean values.
..
.. bpo: 34556
.. date: 2019-05-05-18-09-40
.. nonce: o9kfpu
.. section: Core and Builtins
Add ``--upgrade-deps`` to venv module. Patch by Cooper Ry Lees
..
.. bpo: 20523
.. date: 2019-02-15-20-42-36
.. nonce: rRLrvr
.. section: Core and Builtins
``pdb.Pdb`` supports ~/.pdbrc in Windows 7. Patch by Tim Hopper and Dan
Lidral-Porter.
..
.. bpo: 35551
.. date: 2019-01-18-16-16-27
.. nonce: oF5pbO
.. section: Core and Builtins
Updated encodings: - Removed the "tis260" encoding, which was an alias for
the nonexistent "tactis" codec. - Added "mac_centeuro" as an alias for the
mac_latin2 encoding.
..
.. bpo: 19072
.. date: 2018-07-23-13-09-54
.. nonce: Gc59GS
.. section: Core and Builtins
The :class:`classmethod` decorator can now wrap other descriptors such as
property objects.  Adapted from a patch written by Graham Dumpleton.
..
.. bpo: 27575
.. date: 2018-06-14-13-55-45
.. nonce: mMYgzv
.. section: Core and Builtins
Improve speed of dictview intersection by directly using set intersection
logic. Patch by David Su.
..
.. bpo: 30773
.. date: 2018-06-07-01-01-20
.. nonce: C31rVE
.. section: Core and Builtins
Prohibit parallel running of aclose() / asend() / athrow(). Fix ag_running
to reflect the actual running status of the AG.
..
.. bpo: 36589
.. date: 2019-11-16-22-56-51
.. nonce: 0Io76D
.. section: Library
The :func:`curses.update_lines_cols` function now returns ``None`` instead
of ``1`` on success.
..
.. bpo: 38807
.. date: 2019-11-15-09-30-29
.. nonce: PsmRog
.. section: Library
Update :exc:`TypeError` messages for :meth:`os.path.join` to include
:class:`os.PathLike` objects as acceptable input types.
..
.. bpo: 38724
.. date: 2019-11-14-14-13-29
.. nonce: T5ySfR
.. section: Library
Add a repr for ``subprocess.Popen`` objects. Patch by Andrey Doroschenko.
..
.. bpo: 38786
.. date: 2019-11-13-16-49-03
.. nonce: gNOwKh
.. section: Library
pydoc now recognizes and parses HTTPS URLs. Patch by python273.
..
.. bpo: 38785
.. date: 2019-11-13-16-17-43
.. nonce: NEOEfk
.. section: Library
Prevent asyncio from crashing if parent ``__init__`` is not called from a
constructor of object derived from ``asyncio.Future``.
..
.. bpo: 38723
.. date: 2019-11-12-15-46-28
.. nonce: gcdMFn
.. section: Library
:mod:`pdb` now uses :meth:`io.open_code` to trigger auditing events.
..
.. bpo: 27805
.. date: 2019-11-11-21-43-06
.. nonce: D3zl1_
.. section: Library
Allow opening pipes and other non-seekable files in append mode with
:func:`open`.
..
.. bpo: 38438
.. date: 2019-11-11-06-14-25
.. nonce: vSVeHN
.. section: Library
Simplify the :mod:`argparse` usage message for ``nargs="*"``.
..
.. bpo: 38761
.. date: 2019-11-10-13-40-33
.. nonce: P1UUIZ
.. section: Library
WeakSet is now registered as a collections.abc.MutableSet.
..
.. bpo: 38716
.. date: 2019-11-06-15-58-07
.. nonce: R3uMLT
.. section: Library
logging: change RotatingHandler namer and rotator to class-level attributes.
This stops __init__ from setting them to None in the case where a subclass
defines them with eponymous methods.
..
.. bpo: 38713
.. date: 2019-11-05-21-22-22
.. nonce: bmhquU
.. section: Library
Add :const:`os.P_PIDFD` constant, which may be passed to :func:`os.waitid` to
wait on a Linux process file descriptor.
..
.. bpo: 38692
.. date: 2019-11-05-19-15-57
.. nonce: 2DCDA-
.. section: Library
Add :class:`asyncio.PidfdChildWatcher`, a Linux-specific child watcher
implementation that polls process file descriptors.
..
.. bpo: 38692
.. date: 2019-11-05-07-18-24
.. nonce: UpatA7
.. section: Library
Expose the Linux ``pidfd_open`` syscall as :func:`os.pidfd_open`.
..
.. bpo: 38602
.. date: 2019-10-27-22-29-45
.. nonce: 7jvYFA
.. section: Library
Added constants :const:`~fcntl.F_OFD_GETLK`, :const:`~fcntl.F_OFD_SETLK` and
:const:`~fcntl.F_OFD_SETLKW` to the :mod:`fcntl` module. Patch by Donghee
Na.
..
.. bpo: 38334
.. date: 2019-10-27-00-08-49
.. nonce: pfLLmc
.. section: Library
Fixed seeking backward on an encrypted :class:`zipfile.ZipExtFile`.
..
.. bpo: 38312
.. date: 2019-10-26-14-42-20
.. nonce: e_FVWh
.. section: Library
Add :func:`curses.get_escdelay`, :func:`curses.set_escdelay`,
:func:`curses.get_tabsize`, and :func:`curses.set_tabsize` functions - by
Anthony Sottile.
..
.. bpo: 38586
.. date: 2019-10-24-17-26-39
.. nonce: cyq5nr
.. section: Library
Now :func:`~logging.config.fileConfig` correctly sets the .name of handlers
loaded.
..
.. bpo: 38565
.. date: 2019-10-24-08-10-30
.. nonce: SWSUst
.. section: Library
Add new cache_parameters() method for functools.lru_cache() to better
support pickling.
..
.. bpo: 34679
.. date: 2019-10-23-16-25-12
.. nonce: Bnw8o3
.. section: Library
asynci.ProactorEventLoop.close() now only calls signal.set_wakeup_fd() in
the main thread.
..
.. bpo: 31202
.. date: 2019-10-20-12-04-48
.. nonce: NfdIus
.. section: Library
The case the result of :func:`pathlib.WindowsPath.glob` matches now the case
of the pattern for literal parts.
..
.. bpo: 36321
.. date: 2019-10-19-21-41-20
.. nonce: CFlxfy
.. section: Library
Remove misspelled attribute.  The 3.8 changelog noted that this would be
removed in 3.9.
..
.. bpo: 38521
.. date: 2019-10-18-13-57-31
.. nonce: U-7aaM
.. section: Library
Fixed erroneous equality comparison in statistics.NormalDist().
..
.. bpo: 38493
.. date: 2019-10-16-19-56-51
.. nonce: 86ExWB
.. section: Library
Added :const:`~os.CLD_KILLED` and :const:`~os.CLD_STOPPED` for
:attr:`si_code`. Patch by Donghee Na.
..
.. bpo: 38478
.. date: 2019-10-15-11-37-57
.. nonce: A87OPO
.. section: Library
Fixed a bug in :meth:`inspect.signature.bind` that was causing it to fail
when handling a keyword argument with same name as positional-only
parameter. Patch by Pablo Galindo.
..
.. bpo: 33604
.. date: 2019-10-15-09-47-40
.. nonce: J12cWT
.. section: Library
Fixed ``hmac.new`` and ``hmac.HMAC`` to raise TypeError instead of ValueError
when the digestmod parameter, now required in 3.8, is omitted.  Also
clarified the hmac module documentation and docstrings.
..
.. bpo: 38378
.. date: 2019-10-13-11-00-03
.. nonce: yYNpSm
.. section: Library
Parameters *out* and *in* of :func:`os.sendfile` was renamed to *out_fd* and
*in_fd*.
..
.. bpo: 38417
.. date: 2019-10-12-00-13-47
.. nonce: W7x_aS
.. section: Library
Added support for setting the umask in the child process to the subprocess
module on POSIX systems.
..
.. bpo: 38449
.. date: 2019-10-11-18-49-00
.. nonce: 9TWMlz
.. section: Library
Revert PR 15522, which introduces a regression in
:meth:`mimetypes.guess_type` due to improper handling of filenames as urls.
..
.. bpo: 38431
.. date: 2019-10-10-16-53-00
.. nonce: d5wzNp
.. section: Library
Fix ``__repr__`` method for :class:`dataclasses.InitVar` to support typing
objects, patch by Samuel Colvin.
..
.. bpo: 38109
.. date: 2019-10-10-00-25-28
.. nonce: 9w-IGF
.. section: Library
Add missing :const:`stat.S_IFDOOR`, :const:`stat.S_IFPORT`,
:const:`stat.S_IFWHT`, :func:`stat.S_ISDOOR`, :func:`stat.S_ISPORT`, and
:func:`stat.S_ISWHT` values to the Python implementation of :mod:`stat`.
..
.. bpo: 38422
.. date: 2019-10-09-18-16-51
.. nonce: aiM5bq
.. section: Library
Clarify docstrings of pathlib suffix(es)
..
.. bpo: 38405
.. date: 2019-10-08-11-18-40
.. nonce: 0-7e7s
.. section: Library
Nested subclasses of :class:`typing.NamedTuple` are now pickleable.
..
.. bpo: 38332
.. date: 2019-10-05-02-07-52
.. nonce: hwrPN7
.. section: Library
Prevent :exc:`KeyError` thrown by :func:`!_encoded_words.decode` when given
an encoded-word with invalid content-type encoding from propagating all the
way to :func:`email.message.get`.
..
.. bpo: 38371
.. date: 2019-10-04-18-39-59
.. nonce: S6Klvm
.. section: Library
Deprecated the ``split()`` method in :class:`!_tkinter.TkappType` in favour
of the ``splitlist()`` method which has more consistent and predictable
behavior.
..
.. bpo: 38341
.. date: 2019-10-01-21-06-18
.. nonce: uqwgU_
.. section: Library
Add :exc:`smtplib.SMTPNotSupportedError` to the :mod:`smtplib` exported
names.
..
.. bpo: 38319
.. date: 2019-09-30-22-06-33
.. nonce: 5QjiDa
.. section: Library
sendfile() used in socket and shutil modules was raising OverflowError for
files >= 2GiB on 32-bit architectures.  (patch by Giampaolo Rodola)
..
.. bpo: 38242
.. date: 2019-09-30-00-15-27
.. nonce: uPIyAc
.. section: Library
Revert the new asyncio Streams API
..
.. bpo: 13153
.. date: 2019-09-29-22-47-37
.. nonce: 0mO9qR
.. section: Library
OS native encoding is now used for converting between Python strings and Tcl
objects.  This allows to display, copy and paste to clipboard emoji and
other non-BMP characters.  Converting strings from Tcl to Python and back
now never fails (except MemoryError).
..
.. bpo: 38019
.. date: 2019-09-29-13-50-24
.. nonce: 6MoOE3
.. section: Library
Correctly handle pause/resume reading of closed asyncio unix pipe.
..
.. bpo: 38163
.. date: 2019-09-28-20-16-40
.. nonce: x51-vK
.. section: Library
Child mocks will now detect their type as either synchronous or
asynchronous, asynchronous child mocks will be AsyncMocks and synchronous
child mocks will be either MagicMock or Mock (depending on their parent
type).
..
.. bpo: 38161
.. date: 2019-09-27-16-31-28
.. nonce: zehai1
.. section: Library
Removes _AwaitEvent from AsyncMock.
..
.. bpo: 38216
.. date: 2019-09-27-15-24-45
.. nonce: -7yvZR
.. section: Library
Allow the rare code that wants to send invalid http requests from the
``http.client`` library a way to do so.  The fixes for bpo-30458 led to
breakage for some projects that were relying on this ability to test their
own behavior in the face of bad requests.
..
.. bpo: 28286
.. date: 2019-09-26-12-16-30
.. nonce: LdSsrN
.. section: Library
Deprecate opening :class:`~gzip.GzipFile` for writing implicitly.  Always
specify the *mode* argument for writing.
..
.. bpo: 38108
.. date: 2019-09-25-21-37-02
.. nonce: Jr9HU6
.. section: Library
Any synchronous magic methods on an AsyncMock now return a MagicMock. Any
asynchronous magic methods on a MagicMock now return an AsyncMock.
..
.. bpo: 38265
.. date: 2019-09-25-05-16-19
.. nonce: X6-gsT
.. section: Library
Update the *length* parameter of :func:`os.pread` to accept
:c:type:`Py_ssize_t` instead of :c:expr:`int`.
..
.. bpo: 38112
.. date: 2019-09-24-10-55-01
.. nonce: 2EinX9
.. section: Library
:mod:`compileall` has a higher default recursion limit and new command-line
arguments for path manipulation, symlinks handling, and multiple
optimization levels.
..
.. bpo: 38248
.. date: 2019-09-22-13-05-36
.. nonce: Yo3N_1
.. section: Library
asyncio: Fix inconsistent immediate Task cancellation
..
.. bpo: 38237
.. date: 2019-09-20-14-27-17
.. nonce: xRUZbx
.. section: Library
The arguments for the builtin pow function are more descriptive. They can
now also be passed in as keywords.
..
.. bpo: 34002
.. date: 2019-09-19-19-58-33
.. nonce: KBnaVX
.. section: Library
Improve efficiency in parts of email package by changing while-pop to a for
loop, using isdisjoint instead of set intersections.
..
.. bpo: 38191
.. date: 2019-09-17-12-28-27
.. nonce: 1TU0HV
.. section: Library
Constructors of :class:`~typing.NamedTuple` and :class:`~typing.TypedDict`
types now accept arbitrary keyword argument names, including "cls", "self",
"typename", "_typename", "fields" and "_fields".
..
.. bpo: 38155
.. date: 2019-09-16-21-47-48
.. nonce: d92lRc
.. section: Library
Add ``__all__`` to  :mod:`datetime`. Patch by Tahia Khan.
..
.. bpo: 38185
.. date: 2019-09-16-19-12-57
.. nonce: zYWppY
.. section: Library
Fixed case-insensitive string comparison in :class:`sqlite3.Row` indexing.
..
.. bpo: 38136
.. date: 2019-09-16-09-54-42
.. nonce: MdI-Zb
.. section: Library
Changes AsyncMock call count and await count to be two different counters.
Now await count only counts when a coroutine has been awaited, not when it
has been called, and vice-versa. Update the documentation around this.
..
.. bpo: 37828
.. date: 2019-09-15-21-31-18
.. nonce: gLLDX7
.. section: Library
Fix default mock name in :meth:`unittest.mock.Mock.assert_called`
exceptions. Patch by Abraham Toriz Cruz.
..
.. bpo: 38175
.. date: 2019-09-15-10-30-33
.. nonce: 61XlUv
.. section: Library
Fix a memory leak in comparison of :class:`sqlite3.Row` objects.
..
.. bpo: 33936
.. date: 2019-09-14-10-34-00
.. nonce: 8wCI_n
.. section: Library
_hashlib no longer calls obsolete OpenSSL initialization function with
OpenSSL 1.1.0+.
..
.. bpo: 34706
.. date: 2019-09-13-14-54-33
.. nonce: HWVpOY
.. section: Library
Preserve subclassing in inspect.Signature.from_callable.
..
.. bpo: 38153
.. date: 2019-09-13-12-18-51
.. nonce: nHAbuJ
.. section: Library
Names of hashing algorithms from OpenSSL are now normalized to follow
Python's naming conventions. For example OpenSSL uses sha3-512 instead of
sha3_512 or blake2b512 instead of blake2b.
..
.. bpo: 38115
.. date: 2019-09-13-09-24-58
.. nonce: BOO-Y1
.. section: Library
Fix a bug in dis.findlinestarts() where it would return invalid bytecode
offsets. Document that a code object's co_lnotab can contain invalid
bytecode offsets.
..
.. bpo: 38148
.. date: 2019-09-13-08-55-43
.. nonce: Lnww6D
.. section: Library
Add slots to :mod:`asyncio` transport classes, which can reduce memory
usage.
..
.. bpo: 38142
.. date: 2019-09-12-18-41-35
.. nonce: 1I0Ch0
.. section: Library
The _hashlib OpenSSL wrapper extension module is now PEP-384 compliant.
..
.. bpo: 9216
.. date: 2019-09-12-14-54-45
.. nonce: W7QMpC
.. section: Library
hashlib constructors now support usedforsecurity flag to signal that a
hashing algorithm is not used in a security context.
..
.. bpo: 36991
.. date: 2019-09-12-14-52-38
.. nonce: 1OcSm8
.. section: Library
Fixes a potential incorrect AttributeError exception escaping
ZipFile.extract() in some unsupported input error situations.
..
.. bpo: 38134
.. date: 2019-09-12-13-18-55
.. nonce: gXJTbP
.. section: Library
Remove obsolete copy of PBKDF2_HMAC_fast. All supported OpenSSL versions
contain a fast implementation.
..
.. bpo: 38132
.. date: 2019-09-12-12-47-35
.. nonce: KSFx1F
.. section: Library
The OpenSSL hashlib wrapper uses a simpler implementation. Several Macros
and pointless caches are gone. The hash name now comes from OpenSSL's EVP.
The algorithm name stays the same, except it is now always lower case.
..
.. bpo: 38008
.. date: 2019-09-12-10-47-34
.. nonce: sH74Iy
.. section: Library
Fix parent class check in protocols to correctly identify the module that
provides a builtin protocol, instead of assuming they all come from the
:mod:`collections.abc` module
..
.. bpo: 34037
.. date: 2019-09-11-21-38-41
.. nonce: LIAS_3
.. section: Library
For :mod:`asyncio`, add a new coroutine
:meth:`loop.shutdown_default_executor`. The new coroutine provides an API to
schedule an executor shutdown that waits on the threadpool to finish
closing. Also, :func:`asyncio.run` has been updated to utilize the new
coroutine. Patch by Kyle Stanley.
..
.. bpo: 37405
.. date: 2019-09-11-20-27-41
.. nonce: MG5xiY
.. section: Library
Fixed regression bug for socket.getsockname() for non-CAN_ISOTP AF_CAN
address family sockets by returning a 1-tuple instead of string.
..
.. bpo: 38121
.. date: 2019-09-11-16-54-57
.. nonce: SrSDzB
.. section: Library
Update parameter names on functions in importlib.metadata matching the
changes in the 0.22 release of importlib_metadata.
..
.. bpo: 38110
.. date: 2019-09-11-14-49-20
.. nonce: A19Y-q
.. section: Library
The os.closewalk() implementation now uses the libc fdwalk() API on
platforms where it is available.
..
.. bpo: 38093
.. date: 2019-09-11-14-45-30
.. nonce: yQ6k7y
.. section: Library
Fixes AsyncMock so it doesn't crash when used with AsyncContextManagers or
AsyncIterators.
..
.. bpo: 37488
.. date: 2019-09-11-11-44-16
.. nonce: S8CJUL
.. section: Library
Add warning to :meth:`datetime.utctimetuple`,  :meth:`datetime.utcnow` and
:meth:`datetime.utcfromtimestamp` .
..
.. bpo: 35640
.. date: 2019-09-10-15-52-55
.. nonce: X0lp5f
.. section: Library
Allow passing a :term:`path-like object` as ``directory`` argument to the
:class:`http.server.SimpleHTTPRequestHandler` class. Patch by Géry Ogam.
..
.. bpo: 38086
.. date: 2019-09-10-11-42-59
.. nonce: w5TlG-
.. section: Library
Update importlib.metadata with changes from `importlib_metadata 0.21
<https://gitlab.com/python-devs/importlib_metadata/blob/0.21/importlib_metadata/docs/changelog.rst>`_.
..
.. bpo: 37251
.. date: 2019-09-10-10-59-50
.. nonce: 8zn2o3
.. section: Library
Remove ``__code__`` check in AsyncMock that incorrectly evaluated function
specs as async objects but failed to evaluate classes with ``__await__`` but
no ``__code__`` attribute defined as async objects.
..
.. bpo: 38037
.. date: 2019-09-09-18-39-23
.. nonce: B0UgFU
.. section: Library
Fix reference counters in the :mod:`signal` module.
..
.. bpo: 38066
.. date: 2019-09-09-14-39-47
.. nonce: l9mWv-
.. section: Library
Hide internal asyncio.Stream methods: feed_eof(), feed_data(),
set_exception() and set_transport().
..
.. bpo: 38059
.. date: 2019-09-08-11-36-50
.. nonce: 8SA6co
.. section: Library
inspect.py now uses sys.exit() instead of exit()
..
.. bpo: 38049
.. date: 2019-09-07-12-32-50
.. nonce: xKP4tf
.. section: Library
Added command-line interface for the :mod:`ast` module.
..
.. bpo: 37953
.. date: 2019-09-06-17-40-34
.. nonce: db5FQq
.. section: Library
In :mod:`typing`, improved the ``__hash__`` and ``__eq__`` methods for
:class:`ForwardReferences`.
..
.. bpo: 38026
.. date: 2019-09-04-20-34-14
.. nonce: 0LLRX-
.. section: Library
Fixed :func:`inspect.getattr_static` used ``isinstance`` while it should
avoid dynamic lookup.
..
.. bpo: 35923
.. date: 2019-09-03-01-41-35
.. nonce: lYpKbY
.. section: Library
Update :class:`importlib.machinery.BuiltinImporter` to use
``loader._ORIGIN`` instead of a hardcoded value. Patch by Donghee Na.
..
.. bpo: 38010
.. date: 2019-09-02-14-30-39
.. nonce: JOnz9Z
.. section: Library
In ``importlib.metadata`` sync with ``importlib_metadata`` 0.20, clarifying
behavior of ``files()`` and fixing issue where only one requirement was
returned for ``requires()`` on ``dist-info`` packages.
..
.. bpo: 38006
.. date: 2019-09-02-13-37-27
.. nonce: Y7vA0Q
.. section: Library
weakref.WeakValueDictionary defines a local remove() function used as
callback for weak references. This function was created with a closure.
Modify the implementation to avoid the closure.
..
.. bpo: 37995
.. date: 2019-08-31-13-36-09
.. nonce: rS8HzT
.. section: Library
Added the *indent* option to :func:`ast.dump` which allows it to produce a
multiline indented output.
..
.. bpo: 34410
.. date: 2019-08-31-01-52-59
.. nonce: 7KbWZQ
.. section: Library
Fixed a crash in the :func:`tee` iterator when re-enter it. RuntimeError is
now raised in this case.
..
.. bpo: 37140
.. date: 2019-08-30-11-21-10
.. nonce: cFAX-a
.. section: Library
Fix a ctypes regression of Python 3.8. When a ctypes.Structure is passed by
copy to a function, ctypes internals created a temporary object which had
the side effect of calling the structure finalizer (__del__) twice. The
Python semantics requires a finalizer to be called exactly once. Fix ctypes
internals to no longer call the finalizer twice.
..
.. bpo: 37587
.. date: 2019-08-29-18-48-48
.. nonce: N7TGTC
.. section: Library
``_json.scanstring`` is now up to 3x faster when there are many backslash
escaped characters in the JSON string.
..
.. bpo: 37834
.. date: 2019-08-29-16-41-36
.. nonce: FThnsh
.. section: Library
Prevent shutil.rmtree exception when built on non-Windows system without fd
system call support, like older versions of macOS.
..
.. bpo: 10978
.. date: 2019-08-29-01-19-13
.. nonce: J6FQYY
.. section: Library
Semaphores and BoundedSemaphores can now release more than one waiting
thread at a time.
..
.. bpo: 37972
.. date: 2019-08-28-21-40-12
.. nonce: kP-n4L
.. section: Library
Subscripts to the ``unittest.mock.call`` objects now receive the same chaining
mechanism as any other custom attributes, so that the following usage no
longer raises a ``TypeError``:
``call().foo().__getitem__('bar')``
Patch by blhsing
..
.. bpo: 37965
.. date: 2019-08-28-14-04-18
.. nonce: 7xGE-C
.. section: Library
Fix C compiler warning caused by distutils.ccompiler.CCompiler.has_function.
..
.. bpo: 37964
.. date: 2019-08-27-21-19-28
.. nonce: SxdnsF
.. section: Library
Add ``F_GETPATH`` command to :mod:`fcntl`.
..
.. bpo: 37960
.. date: 2019-08-27-10-52-13
.. nonce: CTY7Lw
.. section: Library
``repr()`` of buffered and text streams now silences only expected
exceptions when get the value of "name" and "mode" attributes.
..
.. bpo: 37961
.. date: 2019-08-27-10-30-44
.. nonce: 4nm0zZ
.. section: Library
Add a ``total_nframe`` field to the traces collected by the tracemalloc
module. This field indicates the original number of frames before it was
truncated.
..
.. bpo: 37951
.. date: 2019-08-27-10-03-48
.. nonce: MfRQgL
.. section: Library
Most features of the subprocess module now work again in subinterpreters.
Only *preexec_fn* is restricted in subinterpreters.
..
.. bpo: 36205
.. date: 2019-08-27-03-53-26
.. nonce: AfkGRl
.. section: Library
Fix the rusage implementation of time.process_time() to correctly report the
sum of the system and user CPU time.
..
.. bpo: 37950
.. date: 2019-08-26-10-45-51
.. nonce: -K1IKT
.. section: Library
Fix :func:`ast.dump` when call with incompletely initialized node.
..
.. bpo: 34679
.. date: 2019-08-25-18-07-48
.. nonce: HECzL7
.. section: Library
Restores instantiation of Windows IOCP event loops from the non-main thread.
..
.. bpo: 36917
.. date: 2019-08-25-14-56-42
.. nonce: GBxdw2
.. section: Library
Add default implementation of the :meth:`ast.NodeVisitor.visit_Constant`
method which emits a deprecation warning and calls corresponding methods
``visit_Num()``, ``visit_Str()``, etc.
..
.. bpo: 37798
.. date: 2019-08-24-16-54-49
.. nonce: 7mRQCk
.. section: Library
Update test_statistics.py to verify that the statistics module works well
for both C and Python implementations. Patch by Donghee Na
..
.. bpo: 26589
.. date: 2019-08-23-00-55-19
.. nonce: M1xyxG
.. section: Library
Added a new status code to the http module: 451
UNAVAILABLE_FOR_LEGAL_REASONS
..
.. bpo: 37915
.. date: 2019-08-22-16-13-27
.. nonce: xyoZI5
.. section: Library
Fix a segmentation fault that appeared when comparing instances of
``datetime.timezone`` and ``datetime.tzinfo`` objects. Patch by Pablo
Galindo.
..
.. bpo: 32554
.. date: 2019-08-22-01-49-05
.. nonce: 4xiXyM
.. section: Library
Deprecate having random.seed() call hash on arbitrary types.
..
.. bpo: 9938
.. date: 2019-08-21-16-38-56
.. nonce: t3G7N9
.. section: Library
Add optional keyword argument ``exit_on_error`` for :class:`ArgumentParser`.
..
.. bpo: 37851
.. date: 2019-08-21-13-43-04
.. nonce: mIIfD_
.. section: Library
The :mod:`faulthandler` module no longer allocates its alternative stack at
Python startup. Now the stack is only allocated at the first faulthandler
usage.
..
.. bpo: 32793
.. date: 2019-08-20-05-17-32
.. nonce: cgpXl6
.. section: Library
Fix a duplicated debug message when :meth:`smtplib.SMTP.connect` is called.
..
.. bpo: 37885
.. date: 2019-08-19-10-31-41
.. nonce: 4Nc9sp
.. section: Library
venv: Don't generate unset variable warning on deactivate.
..
.. bpo: 37868
.. date: 2019-08-17-22-33-54
.. nonce: hp64fi
.. section: Library
Fix dataclasses.is_dataclass when given an instance that never raises
AttributeError in __getattr__.  That is, an object that returns something
for __dataclass_fields__ even if it's not a dataclass.
..
.. bpo: 37811
.. date: 2019-08-14-21-41-07
.. nonce: d1xYj7
.. section: Library
Fix ``socket`` module's ``socket.connect(address)`` function being unable to
establish connection in case of interrupted system call. The problem was
observed on all OSes which ``poll(2)`` system call can take only
non-negative integers and -1 as a timeout value.
..
.. bpo: 37863
.. date: 2019-08-14-20-46-39
.. nonce: CkXqgX
.. section: Library
Optimizations for Fraction.__hash__ suggested by Tim Peters.
..
.. bpo: 21131
.. date: 2019-08-14-15-34-23
.. nonce: 0MMQRi
.. section: Library
Fix ``faulthandler.register(chain=True)`` stack. faulthandler now allocates
a dedicated stack of ``SIGSTKSZ*2`` bytes, instead of just ``SIGSTKSZ``
bytes. Calling the previous signal handler in faulthandler signal handler
uses more than ``SIGSTKSZ`` bytes of stack memory on some platforms.
..
.. bpo: 37798
.. date: 2019-08-14-13-51-24
.. nonce: AmXrik
.. section: Library
Add C fastpath for statistics.NormalDist.inv_cdf() Patch by Donghee Na
..
.. bpo: 37804
.. date: 2019-08-12-23-07-47
.. nonce: Ene6L-
.. section: Library
Remove the deprecated method ``threading.Thread.isAlive()``. Patch by Donghee
Na.
..
.. bpo: 37819
.. date: 2019-08-11-10-34-19
.. nonce: LVJls-
.. section: Library
Add Fraction.as_integer_ratio() to match the corresponding methods in bool,
int, float, and decimal.
..
.. bpo: 14465
.. date: 2019-08-10-18-50-04
.. nonce: qZGC4g
.. section: Library
Add an xml.etree.ElementTree.indent() function for pretty-printing XML
trees. Contributed by Stefan Behnel.
..
.. bpo: 37810
.. date: 2019-08-10-12-33-27
.. nonce: d4zbvB
.. section: Library
Fix :mod:`difflib` ``?`` hint in diff output when dealing with tabs.  Patch
by Anthony Sottile.
..
.. bpo: 37772
.. date: 2019-08-07-23-48-09
.. nonce: hLCvdn
.. section: Library
In ``zipfile.Path``, when adding implicit dirs, ensure that ancestral
directories are added and that duplicates are excluded.
..
.. bpo: 18578
.. date: 2019-08-07-19-34-07
.. nonce: xfvdb_
.. section: Library
Renamed and documented ``test.bytecode_helper`` as
``test.support.bytecode_helper``. Patch by Joannah Nanjekye.
..
.. bpo: 37785
.. date: 2019-08-07-14-49-22
.. nonce: y7OlT8
.. section: Library
Fix xgettext warnings in :mod:`argparse`.
..
.. bpo: 34488
.. date: 2019-08-06-21-30-58
.. nonce: OqxVo8
.. section: Library
:meth:`writelines` method of :class:`io.BytesIO` is now slightly faster when
many small lines are passed. Patch by Sergey Fedoseev.
..
.. bpo: 37449
.. date: 2019-08-04-17-22-33
.. nonce: ycbL2z
.. section: Library
``ensurepip`` now uses ``importlib.resources.read_binary()`` to read data
instead of ``pkgutil.get_data()``. Patch by Joannah Nanjekye.
..
.. bpo: 28292
.. date: 2019-08-04-11-47-58
.. nonce: vkihH5
.. section: Library
Mark calendar.py helper functions as being private.  The follows PEP 8
guidance to maintain the style conventions in the module and it addresses a
known case of user confusion.
..
.. bpo: 18049
.. date: 2019-08-02-16-44-42
.. nonce: OA4qBL
.. section: Library
Add definition of THREAD_STACK_SIZE for AIX in Python/thread_pthread.h The
default thread stacksize caused crashes with the default recursion limit
Patch by M Felt
..
.. bpo: 37742
.. date: 2019-08-02-14-01-25
.. nonce: f4Xn9S
.. section: Library
The logging.getLogger() API now returns the root logger when passed the name
'root', whereas previously it returned a non-root logger named 'root'. This
could affect cases where user code explicitly wants a non-root logger named
'root', or instantiates a logger using logging.getLogger(__name__) in some
top-level module called 'root.py'.
..
.. bpo: 37738
.. date: 2019-08-01-17-11-16
.. nonce: A3WWcT
.. section: Library
Fix the implementation of curses ``addch(str, color_pair)``: pass the color
pair to ``setcchar()``, instead of always passing 0 as the color pair.
..
.. bpo: 37723
.. date: 2019-07-31-16-49-01
.. nonce: zq6tw8
.. section: Library
Fix performance regression on regular expression parsing with huge character
sets. Patch by Yann Vaginay.
..
.. bpo: 35943
.. date: 2019-07-31-15-52-51
.. nonce: -KswoB
.. section: Library
The function :c:func:`PyImport_GetModule` now ensures any module it returns
is fully initialized. Patch by Joannah Nanjekye.
..
.. bpo: 32178
.. date: 2019-07-30-22-41-05
.. nonce: X-IFLe
.. section: Library
Fix IndexError in :mod:`email` package when trying to parse invalid address
fields starting with ``:``.
..
.. bpo: 37268
.. date: 2019-07-30-01-27-29
.. nonce: QDmA44
.. section: Library
The :mod:`parser` module is deprecated and will be removed in future
versions of Python.
..
.. bpo: 11953
.. date: 2019-07-29-21-39-45
.. nonce: 4Hpwf9
.. section: Library
Completing WSA* error codes in :mod:`socket`.
..
.. bpo: 37685
.. date: 2019-07-28-22-25-25
.. nonce: _3bN9f
.. section: Library
Fixed comparisons of :class:`datetime.timedelta` and
:class:`datetime.timezone`.
..
.. bpo: 37697
.. date: 2019-07-28-17-44-21
.. nonce: 7UV5d0
.. section: Library
Synchronize ``importlib.metadata`` with `importlib_metadata 0.19
<https://gitlab.com/python-devs/importlib_metadata/-/milestones/20>`_,
improving handling of EGG-INFO files and fixing a crash when entry point
names contained colons.
..
.. bpo: 37695
.. date: 2019-07-27-20-21-03
.. nonce: QANdvg
.. section: Library
Correct :func:`curses.unget_wch` error message.  Patch by Anthony Sottile.
..
.. bpo: 37689
.. date: 2019-07-27-18-00-43
.. nonce: glEmZi
.. section: Library
Add :meth:`is_relative_to` in :class:`PurePath` to determine whether or not
one path is relative to another.
..
.. bpo: 29553
.. date: 2019-07-27-10-14-45
.. nonce: TVeIDe
.. section: Library
Fixed :meth:`argparse.ArgumentParser.format_usage` for mutually exclusive
groups. Patch by Andrew Nester.
..
.. bpo: 37691
.. date: 2019-07-26-22-30-01
.. nonce: 1Li3rx
.. section: Library
Let math.dist() accept coordinates as sequences (or iterables) rather than
just tuples.
..
.. bpo: 37685
.. date: 2019-07-26-00-12-29
.. nonce: TqckMZ
.. section: Library
Fixed ``__eq__``, ``__lt__`` etc implementations in some classes. They now
return :data:`NotImplemented` for unsupported type of the other operand.
This allows the other operand to play role (for example the equality
comparison with :data:`~unittest.mock.ANY` will return ``True``).
..
.. bpo: 37354
.. date: 2019-07-25-10-28-40
.. nonce: RT3_3H
.. section: Library
Make Activate.ps1 Powershell script static to allow for signing it.
..
.. bpo: 37664
.. date: 2019-07-24-18-27-44
.. nonce: o-GYZC
.. section: Library
Update wheels bundled with ensurepip (pip 19.2.3 and setuptools 41.2.0)
..
.. bpo: 37663
.. date: 2019-07-24-14-38-53
.. nonce: h4-9-1
.. section: Library
Bring consistency to venv shell activation scripts by always using
__VENV_PROMPT__.
..
.. bpo: 37642
.. date: 2019-07-21-20-59-31
.. nonce: L61Bvy
.. section: Library
Allowed the pure Python implementation of :class:`datetime.timezone` to
represent sub-minute offsets close to minimum and maximum boundaries,
specifically in the ranges (23:59, 24:00) and (-23:59, 24:00). Patch by
Ngalim Siregar
..
.. bpo: 36161
.. date: 2019-07-20-01-17-43
.. nonce: Fzf-f9
.. section: Library
In :mod:`posix`, use ``ttyname_r`` instead of ``ttyname`` for thread safety.
..
.. bpo: 36324
.. date: 2019-07-19-22-44-41
.. nonce: 1VjywS
.. section: Library
Make internal attributes for statistics.NormalDist() private.
..
.. bpo: 37555
.. date: 2019-07-19-20-13-48
.. nonce: S5am28
.. section: Library
Fix ``NonCallableMock._call_matcher`` returning tuple instead of ``_Call``
object when ``self._spec_signature`` exists. Patch by Elizabeth Uselton
..
.. bpo: 29446
.. date: 2019-07-19-16-06-48
.. nonce: iXGuoi
.. section: Library
Make ``from tkinter import *`` import only the expected objects.
..
.. bpo: 16970
.. date: 2019-07-19-01-46-56
.. nonce: GEASf5
.. section: Library
Adding a value error when an invalid value in passed to nargs Patch by
Robert Leenders
..
.. bpo: 34443
.. date: 2019-07-17-11-10-08
.. nonce: OFnGqz
.. section: Library
Exceptions from :mod:`enum` now use the ``__qualname`` of the enum class in
the exception message instead of the ``__name__``.
..
.. bpo: 37491
.. date: 2019-07-17-06-54-43
.. nonce: op0aMs
.. section: Library
Fix ``IndexError`` when parsing email headers with unexpectedly ending
bare-quoted string value. Patch by Abhilash Raj.
..
.. bpo: 37587
.. date: 2019-07-13-16-02-48
.. nonce: fd-1aF
.. section: Library
Make json.loads faster for long strings. (Patch by Marco Paolini)
..
.. bpo: 18378
.. date: 2019-07-13-13-40-12
.. nonce: NHcojp
.. section: Library
Recognize "UTF-8" as a valid value for LC_CTYPE in locale._parse_localename.
..
.. bpo: 37579
.. date: 2019-07-13-10-59-43
.. nonce: B1Tq9i
.. section: Library
Return :exc:`NotImplemented` in Python implementation of ``__eq__`` for
:class:`~datetime.timedelta` and :class:`~datetime.time` when the other
object being compared is not of the same type to match C implementation.
Patch by Karthikeyan Singaravelan.
..
.. bpo: 21478
.. date: 2019-07-10-23-07-11
.. nonce: cCw9rF
.. section: Library
Record calls to parent when autospecced object is attached to a mock using
:func:`unittest.mock.attach_mock`. Patch by Karthikeyan Singaravelan.
..
.. bpo: 37531
.. date: 2019-07-09-19-38-26
.. nonce: GX7s8S
.. section: Library
"python3 -m test -jN --timeout=TIMEOUT" now kills a worker process if it
runs longer than *TIMEOUT* seconds.
..
.. bpo: 37482
.. date: 2019-07-09-11-20-21
.. nonce: auzvev
.. section: Library
Fix serialization of display name in originator or destination address
fields with both encoded words and special chars.
..
.. bpo: 36993
.. date: 2019-07-09-05-44-39
.. nonce: 4javqu
.. section: Library
Improve error reporting for corrupt zip files with bad zip64 extra data.
Patch by Daniel Hillier.
..
.. bpo: 37502
.. date: 2019-07-08-03-15-04
.. nonce: qZGC4g
.. section: Library
pickle.loads() no longer raises TypeError when the buffers argument is set
to None
..
.. bpo: 37520
.. date: 2019-07-07-21-09-08
.. nonce: Gg0KD6
.. section: Library
Correct behavior for zipfile.Path.parent when the path object identifies a
subdirectory.
..
.. bpo: 18374
.. date: 2019-07-05-21-46-45
.. nonce: qgE0H3
.. section: Library
Fix the ``.col_offset`` attribute of nested :class:`ast.BinOp` instances
which had a too large value in some situations.
..
.. bpo: 37424
.. date: 2019-07-04-13-00-20
.. nonce: 0i1MR-
.. section: Library
Fixes a possible hang when using a timeout on ``subprocess.run()`` while
capturing output.  If the child process spawned its own children or
otherwise connected its stdout or stderr handles with another process, we
could hang after the timeout was reached and our child was killed when
attempting to read final output from the pipes.
..
.. bpo: 37421
.. date: 2019-07-03-12-47-52
.. nonce: gR5hC8
.. section: Library
Fix :func:`multiprocessing.util.get_temp_dir` finalizer: clear also the
'tempdir' configuration of the current process, so next call to
``get_temp_dir()`` will create a new temporary directory, rather than
reusing the removed temporary directory.
..
.. bpo: 37481
.. date: 2019-07-02-13-08-30
.. nonce: hd5k09
.. section: Library
The distutils ``bdist_wininst`` command is deprecated in Python 3.8, use
``bdist_wheel`` (wheel packages) instead.
..
.. bpo: 37479
.. date: 2019-07-02-12-43-57
.. nonce: O53a5S
.. section: Library
When ``Enum.__str__`` is overridden in a derived class, the override will be
used by ``Enum.__format__`` regardless of whether mixin classes are present.
..
.. bpo: 37440
.. date: 2019-06-28-16-40-17
.. nonce: t3wX-N
.. section: Library
http.client now enables TLS 1.3 post-handshake authentication for default
context or if a cert_file is passed to HTTPSConnection.
..
.. bpo: 37437
.. date: 2019-06-27-20-33-50
.. nonce: du39_A
.. section: Library
Update vendorized expat version to 2.2.7.
..
.. bpo: 37428
.. date: 2019-06-27-13-27-02
.. nonce: _wcwUd
.. section: Library
SSLContext.post_handshake_auth = True no longer sets
SSL_VERIFY_POST_HANDSHAKE verify flag for client connections. Although the
option is documented as ignored for clients, OpenSSL implicitly enables cert
chain validation when the flag is set.
..
.. bpo: 37420
.. date: 2019-06-26-22-25-05
.. nonce: CxFJ09
.. section: Library
:func:`os.sched_setaffinity` now correctly handles errors that arise during
iteration over its ``mask`` argument. Patch by Brandt Bucher.
..
.. bpo: 37412
.. date: 2019-06-26-16-28-59
.. nonce: lx0VjC
.. section: Library
The :func:`os.getcwdb` function now uses the UTF-8 encoding on Windows,
rather than the ANSI code page: see :pep:`529` for the rationale. The
function is no longer deprecated on Windows.
..
.. bpo: 37406
.. date: 2019-06-26-03-00-06
.. nonce: uovkpq
.. section: Library
The sqlite3 module now raises TypeError, rather than ValueError, if
operation argument type is not str: execute(), executemany() and calling a
connection.
..
.. bpo: 29412
.. date: 2019-06-25-19-27-25
.. nonce: n4Zqdh
.. section: Library
Fix IndexError in parsing a header value ending unexpectedly. Patch by
Abhilash Raj.
..
.. bpo: 36546
.. date: 2019-06-25-05-07-48
.. nonce: RUcxaK
.. section: Library
The *dist* argument for statistics.quantiles() is now positional only. The
current name doesn't reflect that the argument can be either a dataset or a
distribution.  Marking the parameter as positional avoids confusion and
makes it possible to change the name later.
..
.. bpo: 37394
.. date: 2019-06-25-02-10-00
.. nonce: srZ1zx
.. section: Library
Fix a bug that was causing the :mod:`queue` module to fail if the
accelerator module was not available. Patch by Pablo Galindo.
..
.. bpo: 37376
.. date: 2019-06-24-11-26-34
.. nonce: SwSUQ4
.. section: Library
:mod:`pprint` now has support for :class:`types.SimpleNamespace`. Patch by
Carl Bordum Hansen.
..
.. bpo: 26967
.. date: 2019-06-23-12-46-10
.. nonce: xEuem1
.. section: Library
An :class:`~argparse.ArgumentParser` with ``allow_abbrev=False`` no longer
disables grouping of short flags, such as ``-vv``, but only disables
abbreviation of long flags as documented. Patch by Zac Hatfield-Dodds.
..
.. bpo: 37212
.. date: 2019-06-22-22-00-35
.. nonce: Zhv-tq
.. section: Library
:func:`unittest.mock.call` now preserves the order of keyword arguments in
repr output. Patch by Karthikeyan Singaravelan.
..
.. bpo: 37372
.. date: 2019-06-22-12-30-00
.. nonce: kIKqZ6
.. section: Library
Fix error unpickling datetime.time objects from Python 2 with seconds>=24.
Patch by Justin Blanchard.
..
.. bpo: 37345
.. date: 2019-06-22-08-51-44
.. nonce: o8XABX
.. section: Library
Add formal support for UDPLITE sockets. Support was present before, but it
is now easier to detect support with ``hasattr(socket, 'IPPROTO_UDPLITE')``
and there are constants defined for each of the values needed:
``socket.IPPROTO_UDPLITE``, ``UDPLITE_SEND_CSCOV``, and
``UDPLITE_RECV_CSCOV``. Patch by Gabe Appleton.
..
.. bpo: 37358
.. date: 2019-06-21-14-54-02
.. nonce: RsASpn
.. section: Library
Optimized ``functools.partial`` by using vectorcall.
..
.. bpo: 37347
.. date: 2019-06-20-14-23-48
.. nonce: Gf9yYI
.. section: Library
:meth:`sqlite3.Connection.create_aggregate`,
:meth:`sqlite3.Connection.create_function`,
:meth:`sqlite3.Connection.set_authorizer`,
:meth:`sqlite3.Connection.set_progress_handler`
:meth:`sqlite3.Connection.set_trace_callback` methods lead to segfaults if
some of these methods are called twice with an equal object but not the
same. Now callbacks are stored more carefully. Patch by Aleksandr Balezin.
..
.. bpo: 37163
.. date: 2019-06-19-10-35-53
.. nonce: 9pPg2F
.. section: Library
The *obj* argument of :func:`dataclasses.replace` is positional-only now.
..
.. bpo: 37085
.. date: 2019-06-18-16-29-31
.. nonce: GeYaD6
.. section: Library
Add the optional Linux SocketCAN Broadcast Manager constants, used as flags
to configure the BCM behaviour, in the socket module.  Patch by Karl Ding.
..
.. bpo: 37328
.. date: 2019-06-18-15-31-33
.. nonce: 2PW1-l
.. section: Library
``HTMLParser.unescape`` is removed.  It was undocumented and deprecated
since Python 3.4.
..
.. bpo: 37305
.. date: 2019-06-18-13-59-55
.. nonce: fGzWlP
.. section: Library
Add .webmanifest -> application/manifest+json to list of recognized file
types and content type headers
..
.. bpo: 37320
.. date: 2019-06-17-22-10-37
.. nonce: ffieYa
.. section: Library
``aifc.openfp()`` alias to ``aifc.open()``, ``sunau.openfp()`` alias to
``sunau.open()``, and ``wave.openfp()`` alias to ``wave.open()`` have been
removed. They were deprecated since Python 3.7.
..
.. bpo: 37315
.. date: 2019-06-17-11-59-52
.. nonce: o1xFC0
.. section: Library
Deprecated accepting floats with integral value (like ``5.0``) in
:func:`math.factorial`.
..
.. bpo: 37312
.. date: 2019-06-17-10-03-52
.. nonce: qKvBfF
.. section: Library
``_dummy_thread`` and ``dummy_threading`` modules have been removed. These
modules were deprecated since Python 3.7 which requires threading support.
..
.. bpo: 33972
.. date: 2019-06-15-14-39-50
.. nonce: XxnNPw
.. section: Library
Email with single part but content-type set to ``multipart/*`` doesn't raise
AttributeError anymore.
..
.. bpo: 37280
.. date: 2019-06-14-13-30-47
.. nonce: Fxur0F
.. section: Library
Use threadpool for reading from file for sendfile fallback mode.
..
.. bpo: 37279
.. date: 2019-06-14-13-25-56
.. nonce: OHlW6l
.. section: Library
Fix asyncio sendfile support when sendfile sends extra data in fallback
mode.
..
.. bpo: 19865
.. date: 2019-06-14-08-30-16
.. nonce: FRGH4I
.. section: Library
:func:`ctypes.create_unicode_buffer` now also supports non-BMP characters
on platforms with 16-bit :c:type:`wchar_t` (for example, Windows and AIX).
..
.. bpo: 37266
.. date: 2019-06-13-11-59-52
.. nonce: goLjef
.. section: Library
In a subinterpreter, spawning a daemon thread now raises an exception.
Daemon threads were never supported in subinterpreters. Previously, the
subinterpreter finalization crashed with a Python fatal error if a daemon
thread was still running.
..
.. bpo: 37210
.. date: 2019-06-12-16-10-50
.. nonce: r4yMg6
.. section: Library
Allow pure Python implementation of :mod:`pickle` to work even when the C
:mod:`!_pickle` module is unavailable.
..
.. bpo: 21872
.. date: 2019-06-12-08-56-22
.. nonce: V9QGGN
.. section: Library
Fix :mod:`lzma`: module decompresses data incompletely. When decompressing a
FORMAT_ALONE format file, and it doesn't have the end marker, sometimes the
last one to dozens bytes can't be output. Patch by Ma Lin.
..
.. bpo: 35922
.. date: 2019-06-11-19-34-29
.. nonce: rxpzWr
.. section: Library
Fix :meth:`RobotFileParser.crawl_delay` and
:meth:`RobotFileParser.request_rate` to return ``None`` rather than raise
:exc:`AttributeError` when no relevant rule is defined in the robots.txt
file.  Patch by Rémi Lapeyre.
..
.. bpo: 35766
.. date: 2019-06-11-16-41-40
.. nonce: v1Kj-T
.. section: Library
Change the format of feature_version to be a (major, minor) tuple.
..
.. bpo: 36607
.. date: 2019-06-11-13-52-04
.. nonce: 5_mJkQ
.. section: Library
Eliminate :exc:`RuntimeError` raised by :func:`asyncio.all_tasks` if
internal tasks weak set is changed by another thread during iteration.
..
.. bpo: 18748
.. date: 2019-06-11-01-54-19
.. nonce: ADqCkq
.. section: Library
:class:`!_pyio.IOBase` destructor now does nothing if getting the ``closed``
attribute fails to better mimic :class:`!_io.IOBase` finalizer.
..
.. bpo: 36402
.. date: 2019-06-11-00-35-02
.. nonce: b0IJVp
.. section: Library
Fix a race condition at Python shutdown when waiting for threads. Wait until
the Python thread state of all non-daemon threads get deleted (join all
non-daemon threads), rather than just wait until non-daemon Python threads
complete.
..
.. bpo: 37206
.. date: 2019-06-09-22-25-03
.. nonce: 2WBg4q
.. section: Library
Default values which cannot be represented as Python objects no longer
improperly represented as ``None`` in function signatures.
..
.. bpo: 37111
.. date: 2019-06-09-17-22-33
.. nonce: 2I0z2k
.. section: Library
Added ``encoding`` and ``errors`` keyword parameters to
``logging.basicConfig``.
..
.. bpo: 12144
.. date: 2019-06-08-23-26-58
.. nonce: Z7mz-q
.. section: Library
Ensure cookies with ``expires`` attribute are handled in
:meth:`CookieJar.make_cookies`.
..
.. bpo: 34886
.. date: 2019-06-08-16-03-19
.. nonce: Ov-pc9
.. section: Library
Fix an unintended ValueError from :func:`subprocess.run` when checking for
conflicting *input* and *stdin* or *capture_output* and *stdout* or *stderr*
args when they were explicitly provided but with ``None`` values within a
passed in ``**kwargs`` dict rather than as passed directly by name. Patch
contributed by Rémi Lapeyre.
..
.. bpo: 37173
.. date: 2019-06-08-11-33-48
.. nonce: 0e_8gS
.. section: Library
The exception message for ``inspect.getfile()`` now correctly reports the
passed class rather than the builtins module.
..
.. bpo: 37178
.. date: 2019-06-07-17-16-09
.. nonce: Day_oB
.. section: Library
Give math.perm() a one argument form that means the same as
math.factorial().
..
.. bpo: 37178
.. date: 2019-06-07-17-11-34
.. nonce: b1StSv
.. section: Library
For math.perm(n, k), let k default to n, giving the same result as
factorial.
..
.. bpo: 37165
.. date: 2019-06-05-11-48-19
.. nonce: V_rwfE
.. section: Library
Converted _collections._count_elements to use the Argument Clinic.
..
.. bpo: 34767
.. date: 2019-06-04-23-44-52
.. nonce: BpDShN
.. section: Library
Do not always create a :class:`collections.deque` in :class:`asyncio.Lock`.
..
.. bpo: 37158
.. date: 2019-06-04-22-25-38
.. nonce: JKm15S
.. section: Library
Speed-up statistics.fmean() by switching from a function to a generator.
..
.. bpo: 34282
.. date: 2019-06-04-15-39-14
.. nonce: aAK54n
.. section: Library
Remove ``Enum._convert`` method, deprecated in 3.8.
..
.. bpo: 37150
.. date: 2019-06-04-14-44-41
.. nonce: TTzHxj
.. section: Library
``argparse._ActionsContainer.add_argument`` now throws error, if someone
accidentally pass FileType class object instead of instance of FileType as
``type`` argument.
..
.. bpo: 28724
.. date: 2019-05-30-15-51-42
.. nonce: 34TrS8
.. section: Library
The socket module now has the :func:`socket.send_fds` and
:func:`socket.recv.fds` methods. Contributed by Joannah Nanjekye, Shinya
Okano and Victor Stinner.
..
.. bpo: 35621
.. date: 2019-05-28-19-03-46
.. nonce: Abc1lf
.. section: Library
Support running asyncio subprocesses when execution event loop in a thread
on UNIX.
..
.. bpo: 36520
.. date: 2019-05-28-02-37-00
.. nonce: W4tday
.. section: Library
Lengthy email headers with UTF-8 characters are now properly encoded when
they are folded. Patch by Jeffrey Kintscher.
..
.. bpo: 30835
.. date: 2019-05-27-15-29-46
.. nonce: 3FoaWH
.. section: Library
Fixed a bug in email parsing where a message with invalid bytes in
content-transfer-encoding of a multipart message can cause an
AttributeError. Patch by Andrew Donnellan.
..
.. bpo: 31163
.. date: 2019-05-26-16-34-53
.. nonce: 21A802
.. section: Library
pathlib.Path instance's rename and replace methods now return the new Path
instance.
..
.. bpo: 25068
.. date: 2019-05-22-04-52-35
.. nonce: vR_rC-
.. section: Library
:class:`urllib.request.ProxyHandler` now lowercases the keys of the passed
dictionary.
..
.. bpo: 26185
.. date: 2019-05-20-14-17-29
.. nonce: pQW4mI
.. section: Library
Fix :func:`repr` on empty :class:`ZipInfo` object. Patch by Mickaël
Schoentgen.
..
.. bpo: 21315
.. date: 2019-05-19-10-48-46
.. nonce: PgXVqF
.. section: Library
Email headers containing RFC2047 encoded words are parsed despite the
missing whitespace, and a defect registered. Also missing trailing
whitespace after encoded words is now registered as a defect.
..
.. bpo: 31904
.. date: 2019-05-17-16-50-02
.. nonce: 4a5ggm
.. section: Library
Port test_datetime to VxWorks: skip zoneinfo tests on VxWorks
..
.. bpo: 35805
.. date: 2019-05-17-15-11-08
.. nonce: E4YwYz
.. section: Library
Add parser for Message-ID header and add it to default HeaderRegistry. This
should prevent folding of Message-ID using RFC 2048 encoded words.
..
.. bpo: 36871
.. date: 2019-05-12-12-58-37
.. nonce: 6xiEHZ
.. section: Library
Ensure method signature is used instead of constructor signature of a class
while asserting mock object against method calls. Patch by Karthikeyan
Singaravelan.
..
.. bpo: 35070
.. date: 2019-05-09-18-50-55
.. nonce: 4vaqNL
.. section: Library
posix.getgrouplist() now works correctly when the user belongs to
NGROUPS_MAX supplemental groups. Patch by Jeffrey Kintscher.
..
.. bpo: 31783
.. date: 2019-05-07-19-25-55
.. nonce: lgLo69
.. section: Library
Fix race condition in ThreadPoolExecutor when worker threads are created
during interpreter shutdown.
..
.. bpo: 36582
.. date: 2019-05-07-17-42-36
.. nonce: L_dxR6
.. section: Library
Fix ``UserString.encode()`` to correctly return ``bytes`` rather than a
``UserString`` instance.
..
.. bpo: 32424
.. date: 2019-04-28-10-34-19
.. nonce: eqNPhM
.. section: Library
Deprecate xml.etree.ElementTree.Element.copy() in favor of copy.copy().
Patch by Gordon P. Hemsley
..
.. bpo: 36564
.. date: 2019-04-08-13-00-13
.. nonce: _n67m_
.. section: Library
Fix infinite loop in email header folding logic that would be triggered when
an email policy's max_line_length is not long enough to include the required
markup and any values in the message. Patch by Paul Ganssle
..
.. bpo: 36543
.. date: 2019-04-06-20-08-12
.. nonce: RPjmUz
.. section: Library
Removed methods Element.getchildren(), Element.getiterator() and
ElementTree.getiterator() and the xml.etree.cElementTree module.
..
.. bpo: 36409
.. date: 2019-03-23-16-42-46
.. nonce: ZYVKao
.. section: Library
Remove the old plistlib API deprecated in Python 3.4
..
.. bpo: 36302
.. date: 2019-03-21-19-23-46
.. nonce: Yc591g
.. section: Library
distutils sorts source file lists so that Extension .so files build more
reproducibly by default
..
.. bpo: 36250
.. date: 2019-03-09-16-04-12
.. nonce: tSK4N1
.. section: Library
Ignore ``ValueError`` from ``signal`` with ``interaction`` in non-main
thread.
..
.. bpo: 36046
.. date: 2019-02-19-17-32-45
.. nonce: fX9OPj
.. section: Library
Added ``user``, ``group`` and ``extra_groups`` parameters to the
subprocess.Popen constructor. Patch by Patrick McLean.
..
.. bpo: 32627
.. date: 2019-02-03-19-13-08
.. nonce: b68f64
.. section: Library
Fix compile error when ``_uuid`` headers conflicting included.
..
.. bpo: 35800
.. date: 2019-01-25-17-12-17
.. nonce: MCGJdQ
.. section: Library
Deprecate ``smtpd.MailmanProxy`` ready for future removal.
..
.. bpo: 35168
.. date: 2019-01-22-09-23-20
.. nonce: UGv2yW
.. section: Library
:attr:`shlex.shlex.punctuation_chars` is now a read-only property.
..
.. bpo: 8538
.. date: 2019-01-09-16-18-52
.. nonce: PfVZia
.. section: Library
Add support for boolean actions like ``--foo`` and ``--no-foo`` to argparse.
Patch contributed by Rémi Lapeyre.
..
.. bpo: 20504
.. date: 2018-11-21-18-05-50
.. nonce: kG0ub5
.. section: Library
Fixes a bug in :mod:`!cgi` module when a multipart/form-data request has no
``Content-Length`` header.
..
.. bpo: 25988
.. date: 2018-11-19-10-23-58
.. nonce: 6o7gGK
.. section: Library
The abstract base classes in :mod:`collections.abc` no longer are exposed in
the regular :mod:`collections` module.
..
.. bpo: 11122
.. date: 2018-11-12-19-08-50
.. nonce: Gj7BQn
.. section: Library
Distutils won't check for rpmbuild in specified paths only.
..
.. bpo: 34775
.. date: 2018-09-23-03-18-52
.. nonce: vHeuHk
.. section: Library
Division handling of PurePath now returns NotImplemented instead of raising
a TypeError when passed something other than an instance of str or PurePath.
Patch by Roger Aiudi.
..
.. bpo: 34749
.. date: 2018-09-21-13-23-29
.. nonce: B0k819
.. section: Library
:func:`binascii.a2b_base64` is now up to 2 times faster. Patch by Sergey
Fedoseev.
..
.. bpo: 34519
.. date: 2018-08-27-15-44-50
.. nonce: cPlH1h
.. section: Library
Add additional aliases for HP Roman 8. Patch by Michael Osipov.
..
.. bpo: 28009
.. date: 2018-08-04-12-26-11
.. nonce: 4JcHZb
.. section: Library
Fix uuid.getnode() on platforms with '.' as MAC Addr delimiter as well fix
for MAC Addr format that omits a leading 0 in MAC Addr values. Currently,
AIX is the only know platform with these settings. Patch by Michael Felt.
..
.. bpo: 30618
.. date: 2018-07-14-13-48-56
.. nonce: T5AUF6
.. section: Library
Add :meth:`~pathlib.Path.readlink`. Patch by Girts Folkmanis.
..
.. bpo: 32498
.. date: 2018-06-17-21-02-25
.. nonce: La3TZz
.. section: Library
Made :func:`urllib.parse.unquote` accept bytes in addition to strings.
Patch by Stein Karlsen.
..
.. bpo: 33348
.. date: 2018-04-24-13-18-48
.. nonce: XaJDei
.. section: Library
lib2to3 now recognizes expressions after ``*`` and ``**`` like in ``f(*[] or
[])``.
..
.. bpo: 32689
.. date: 2018-02-13-17-58-30
.. nonce: a-3SnH
.. section: Library
Update :func:`shutil.move` function to allow for Path objects to be used as
source argument. Patch by Emily Morehouse and Maxwell "5.13b" McKinnon.
..
.. bpo: 32820
.. date: 2018-02-13-12-25-43
.. nonce: 0stF0u
.. section: Library
Added ``__format__`` to IPv4 and IPv6 classes.  Always outputs a fully
zero-padded string. Supports b/x/n modifiers (bin/hex/native format).  Native
format for IPv4 is bin, native format for IPv6 is hex. Also supports '#' and
'_' modifiers.
..
.. bpo: 27657
.. date: 2017-12-26-14-32-23
.. nonce: 6BhyVK
.. section: Library
Fix urllib.parse.urlparse() with numeric paths. A string like "path:80" is
no longer parsed as a path but as a scheme ("path") and a path ("80").
..
.. bpo: 4963
.. date: 2017-08-15-11-24-41
.. nonce: LRYres
.. section: Library
Fixed non-deterministic behavior related to mimetypes extension mapping and
module reinitialization.
..
.. bpo: 21767
.. date: 2019-11-17-11-54-57
.. nonce: Qq3Dos
.. section: Documentation
Explicitly mention abc support in functools.singledispatch
..
.. bpo: 38816
.. date: 2019-11-15-11-39-13
.. nonce: vUaSVL
.. section: Documentation
Provides more details about the interaction between :c:func:`fork` and
CPython's runtime, focusing just on the C-API.  This includes cautions about
where :c:func:`fork` should and shouldn't be called.
..
.. bpo: 38351
.. date: 2019-11-15-09-22-28
.. nonce: xwhlse
.. section: Documentation
Modernize :mod:`email` examples from %-formatting to f-strings.
..
.. bpo: 38778
.. date: 2019-11-12-15-31-09
.. nonce: PHhTlv
.. section: Documentation
Document the fact that :exc:`RuntimeError` is raised if :meth:`os.fork` is
called in a subinterpreter.
..
.. bpo: 38592
.. date: 2019-10-26-13-19-07
.. nonce: Y96BYO
.. section: Documentation
Add Brazilian Portuguese to the language switcher at Python Documentation
website.
..
.. bpo: 38294
.. date: 2019-09-27-23-37-41
.. nonce: go_jFf
.. section: Documentation
Add list of no-longer-escaped chars to re.escape documentation
..
.. bpo: 38053
.. date: 2019-09-07-19-09-01
.. nonce: lttibE
.. section: Documentation
Modernized the plistlib documentation
..
.. bpo: 26868
.. date: 2019-09-07-15-55-46
.. nonce: Raw0Gd
.. section: Documentation
Fix example usage of :c:func:`PyModule_AddObject` to properly handle errors.
..
.. bpo: 36797
.. date: 2019-09-05-14-47-51
.. nonce: KN9Ga5
.. section: Documentation
Fix a dead link in the distutils API Reference.
..
.. bpo: 37977
.. date: 2019-08-29-14-38-01
.. nonce: pML-UI
.. section: Documentation
Warn more strongly and clearly about pickle insecurity
..
.. bpo: 37979
.. date: 2019-08-29-10-40-05
.. nonce: TAUx_E
.. section: Documentation
Added a link to dateutil.parser.isoparse in the datetime.fromisoformat
documentation. Patch by Paul Ganssle
..
.. bpo: 12707
.. date: 2019-08-27-01-14-59
.. nonce: Yj3_7_
.. section: Documentation
Deprecate info(), geturl(), getcode() methods in favor of the headers, url,
and status properties, respectively, for HTTPResponse and addinfourl. Also
deprecate the code attribute of addinfourl in favor of the status attribute.
Patch by Ashwin Ramaswami
..
.. bpo: 37937
.. date: 2019-08-24-12-59-06
.. nonce: F7fHbt
.. section: Documentation
Mention ``frame.f_trace`` in :func:`sys.settrace` docs.
..
.. bpo: 37878
.. date: 2019-08-16-20-01-10
.. nonce: MvA6rZ
.. section: Documentation
Make :c:func:`PyThreadState_DeleteCurrent` Internal.
..
.. bpo: 37759
.. date: 2019-08-04-19-20-58
.. nonce: EHRF4i
.. section: Documentation
Beginning edits to Whatsnew 3.8
..
.. bpo: 37726
.. date: 2019-07-31-11-40-06
.. nonce: h-3o9a
.. section: Documentation
Stop recommending getopt in the tutorial for command line argument parsing
and promote argparse.
..
.. bpo: 32910
.. date: 2019-07-25-10-30-32
.. nonce: caLLAe
.. section: Documentation
Remove implementation-specific behaviour of how venv's Deactivate works.
..
.. bpo: 37256
.. date: 2019-07-16-14-48-12
.. nonce: qJTrBb
.. section: Documentation
Fix wording of arguments for :class:`Request` in :mod:`urllib.request`
..
.. bpo: 37284
.. date: 2019-07-13-12-58-20
.. nonce: rP8WpB
.. section: Documentation
Add a brief note to indicate that any new ``sys.implementation`` required
attributes must go through the PEP process.
..
.. bpo: 30088
.. date: 2019-07-13-12-43-01
.. nonce: CIcBjy
.. section: Documentation
Documented that :class:`mailbox.Maildir` constructor doesn't attempt to
verify the maildir folder layout correctness. Patch by Sviatoslav Sydorenko.
..
.. bpo: 37521
.. date: 2019-07-12-15-09-56
.. nonce: 7tiFR-
.. section: Documentation
Fix ``importlib`` examples to insert any newly created modules via
importlib.util.module_from_spec() immediately into sys.modules instead of
after calling loader.exec_module().
Thanks to Benjamin Mintz for finding the bug.
..
.. bpo: 37456
.. date: 2019-07-06-17-51-36
.. nonce: lgAQHn
.. section: Documentation
Slash ('/') is now part of syntax.
..
.. bpo: 37487
.. date: 2019-07-06-17-19-26
.. nonce: QagfZ5
.. section: Documentation
Fix PyList_GetItem index description to include 0.
..
.. bpo: 37149
.. date: 2019-07-06-02-19-02
.. nonce: NumHn3
.. section: Documentation
Replace the dead link to the Tkinter 8.5 reference by John Shipman, New
Mexico Tech, with a link to the archive.org copy.
..
.. bpo: 37478
.. date: 2019-07-06-00-57-27
.. nonce: B0ioLw
.. section: Documentation
Added possible exceptions to the description of os.chdir().
..
.. bpo: 34903
.. date: 2019-06-17-09-36-46
.. nonce: r_wGRc
.. section: Documentation
Documented that in :meth:`datetime.datetime.strptime`, the leading zero in
some two-digit formats is optional. Patch by Mike Gleen.
..
.. bpo: 36260
.. date: 2019-06-04-09-29-00
.. nonce: WrGuc-
.. section: Documentation
Add decompression pitfalls to zipfile module documentation.
..
.. bpo: 37004
.. date: 2019-05-22-04-30-07
.. nonce: BRgxrt
.. section: Documentation
In the documentation for difflib, a note was added explicitly warning that
the results of SequenceMatcher's ratio method may depend on the order of the
input strings.
..
.. bpo: 36960
.. date: 2019-05-18-16-25-44
.. nonce: xEKHXj
.. section: Documentation
Restructured the :mod:`datetime` docs in the interest of making them more
user-friendly and improving readability. Patch by Brad Solomon.
..
.. bpo: 36487
.. date: 2019-04-02-19-23-00
.. nonce: Jg6-MG
.. section: Documentation
Make C-API docs clear about what the "main" interpreter is.
..
.. bpo: 23460
.. date: 2019-02-14-07-12-48
.. nonce: Iqiqtm
.. section: Documentation
The documentation for decimal string formatting using the ``:g`` specifier has
been updated to reflect the correct exponential notation cutoff point.
Original patch contributed by Tuomas Suutari.
..
.. bpo: 35803
.. date: 2019-01-21-14-30-59
.. nonce: yae6Lq
.. section: Documentation
Document and test that ``tempfile`` functions may accept a :term:`path-like
object` for the ``dir`` argument.  Patch by Anthony Sottile.
..
.. bpo: 33944
.. date: 2018-10-26-18-10-29
.. nonce: V1YeOA
.. section: Documentation
Added a note about the intended use of code in .pth files.
..
.. bpo: 34293
.. date: 2018-07-31-15-38-26
.. nonce: yHupAL
.. section: Documentation
Fix the Doc/Makefile regarding PAPER environment variable and PDF builds
..
.. bpo: 25237
.. date: 2018-06-02-12-55-23
.. nonce: m8-JMu
.. section: Documentation
Add documentation for tkinter modules
..
.. bpo: 38614
.. date: 2019-10-30-15-12-32
.. nonce: M6UnLB
.. section: Tests
Fix test_communicate() of test_asyncio.test_subprocess: use
``support.LONG_TIMEOUT`` (5 minutes), instead of just 1 minute.
..
.. bpo: 38614
.. date: 2019-10-28-15-56-02
.. nonce: aDdDYE
.. section: Tests
Add timeout constants to :mod:`test.support`:
:data:`~test.support.LOOPBACK_TIMEOUT`,
:data:`~test.support.INTERNET_TIMEOUT`, :data:`~test.support.SHORT_TIMEOUT`
and :data:`~test.support.LONG_TIMEOUT`.
..
.. bpo: 38502
.. date: 2019-10-17-00-49-38
.. nonce: vUEic7
.. section: Tests
test.regrtest now uses process groups in the multiprocessing mode (-jN
command line option) if process groups are available: if :func:`os.setsid`
and :func:`os.killpg` functions are available.
..
.. bpo: 35998
.. date: 2019-10-16-01-36-15
.. nonce: G305Bf
.. section: Tests
Fix a race condition in test_asyncio.test_start_tls_server_1(). Previously,
there was a race condition between the test main() function which replaces
the protocol and the test ServerProto protocol which sends ANSWER once it
gets HELLO. Now, only the test main() function is responsible to send data,
ServerProto no longer sends data.
..
.. bpo: 38470
.. date: 2019-10-14-22-46-35
.. nonce: NHtzpy
.. section: Tests
Fix ``test_compileall.test_compile_dir_maxlevels()`` on Windows without long
path support: only create 3 subdirectories instead of between 20 and 100
subdirectories.
..
.. bpo: 37531
.. date: 2019-10-08-16-42-05
.. nonce: 7v-_Ca
.. section: Tests
On timeout, regrtest no longer attempts to call ``popen.communicate()``
again: it can hang until all child processes using stdout and stderr pipes
completes. Kill the worker process and ignores its output. Change also the
faulthandler timeout of the main process from 1 minute to 5 minutes, for
Python slowest buildbots.
..
.. bpo: 38239
.. date: 2019-09-26-15-48-36
.. nonce: MfoVzY
.. section: Tests
Fix test_gdb for Link Time Optimization (LTO) builds.
..
.. bpo: 38275
.. date: 2019-09-25-14-40-57
.. nonce: -kdveI
.. section: Tests
test_ssl now handles disabled TLS/SSL versions better. OpenSSL's crypto
policy and run-time settings are recognized and tests for disabled versions
are skipped. Tests also accept more TLS minimum_versions for platforms that
override OpenSSL's default with strict settings.
..
.. bpo: 38271
.. date: 2019-09-25-13-11-29
.. nonce: iHXNIg
.. section: Tests
The private keys for test_ssl were encrypted with 3DES in traditional PKCS#5
format. 3DES and the digest algorithm of PKCS#5 are blocked by some strict
crypto policies. Use PKCS#8 format with AES256 encryption instead.
..
.. bpo: 38270
.. date: 2019-09-25-12-18-31
.. nonce: _x-9uH
.. section: Tests
test.support now has a helper function to check for availability of a hash
digest function. Several tests are refactored avoid MD5 and use SHA256
instead. Other tests are marked to use MD5 and skipped when MD5 is disabled.
..
.. bpo: 37123
.. date: 2019-09-24-12-30-55
.. nonce: IoutBn
.. section: Tests
Multiprocessing test test_mymanager() now also expects -SIGTERM, not only
exitcode 0. BaseManager._finalize_manager() sends SIGTERM to the manager
process if it takes longer than 1 second to stop, which happens on slow
buildbots.
..
.. bpo: 38212
.. date: 2019-09-24-12-24-05
.. nonce: IWbhWz
.. section: Tests
Multiprocessing tests: increase test_queue_feeder_donot_stop_onexc() timeout
from 1 to 60 seconds.
..
.. bpo: 38117
.. date: 2019-09-11-17-22-32
.. nonce: X7LgGY
.. section: Tests
Test with OpenSSL 1.1.1d
..
.. bpo: 38018
.. date: 2019-09-03-19-33-10
.. nonce: zTrMu7
.. section: Tests
Increase code coverage for multiprocessing.shared_memory.
..
.. bpo: 37805
.. date: 2019-08-25-19-51-46
.. nonce: Kl1sti
.. section: Tests
Add tests for json.dump(..., skipkeys=True). Patch by Donghee Na.
..
.. bpo: 37531
.. date: 2019-08-20-19-24-19
.. nonce: wRoXfU
.. section: Tests
Enhance regrtest multiprocess timeout: write a message when killing a worker
process, catch popen.kill() and popen.wait() exceptions, put a timeout on
the second call to popen.communicate().
..
.. bpo: 37876
.. date: 2019-08-16-16-15-14
.. nonce: m3k1w3
.. section: Tests
Add tests for ROT-13 codec.
..
.. bpo: 36833
.. date: 2019-07-18-14-52-58
.. nonce: Zoe9ek
.. section: Tests
Added tests for :samp:`PyDateTime_{xxx}_GET_{xxx}()` macros of the C API of the
:mod:`datetime` module. Patch by Joannah Nanjekye.
..
.. bpo: 37558
.. date: 2019-07-11-10-33-56
.. nonce: SKHRsL
.. section: Tests
Fix test_shared_memory_cleaned_after_process_termination name handling
..
.. bpo: 37526
.. date: 2019-07-09-12-33-18
.. nonce: vmm5y7
.. section: Tests
Add :func:`test.support.catch_threading_exception`: context manager catching
:class:`threading.Thread` exception using :func:`threading.excepthook`.
..
.. bpo: 37421
.. date: 2019-07-08-10-11-36
.. nonce: OY77go
.. section: Tests
test_concurrent_futures now explicitly stops the ForkServer instance if it's
running.
..
.. bpo: 37421
.. date: 2019-07-05-14-47-55
.. nonce: n8o2to
.. section: Tests
multiprocessing tests now stop the ForkServer instance if it's running:
close the "alive" file descriptor to ask the server to stop and then remove
its UNIX address.
..
.. bpo: 37421
.. date: 2019-07-03-00-05-28
.. nonce: ORGRSG
.. section: Tests
test_distutils.test_build_ext() is now able to remove the temporary
directory on Windows: don't import the newly built C extension ("xx") in the
current process, but test it in a separated process.
..
.. bpo: 37421
.. date: 2019-07-02-23-29-06
.. nonce: WEfc5A
.. section: Tests
test_concurrent_futures now cleans up multiprocessing to remove immediately
temporary directories created by multiprocessing.util.get_temp_dir().
..
.. bpo: 37421
.. date: 2019-07-02-23-20-35
.. nonce: HCkKWz
.. section: Tests
test_winconsoleio doesn't leak a temporary file anymore: use
tempfile.TemporaryFile() to remove it when the test completes.
..
.. bpo: 37421
.. date: 2019-07-01-19-57-26
.. nonce: NFH1f0
.. section: Tests
multiprocessing tests now explicitly call ``_run_finalizers()`` to
immediately remove temporary directories created by tests.
..
.. bpo: 37421
.. date: 2019-07-01-19-56-17
.. nonce: bOe350
.. section: Tests
urllib.request tests now call :func:`~urllib.request.urlcleanup` to remove
temporary files created by ``urlretrieve()`` tests and to clear the
``_opener`` global variable set by ``urlopen()`` and functions calling
indirectly ``urlopen()``.
..
.. bpo: 37472
.. date: 2019-07-01-17-19-47
.. nonce: WzkEAx
.. section: Tests
Remove ``Lib/test/outstanding_bugs.py``.
..
.. bpo: 37199
.. date: 2019-06-29-23-56-28
.. nonce: FHDsLf
.. section: Tests
Fix test failures when IPv6 is unavailable or disabled.
..
.. bpo: 19696
.. date: 2019-06-29-16-02-21
.. nonce: 05ijhN
.. section: Tests
Replace deprecated method "random.choose" with "random.choice" in
"test_pkg_import.py".
..
.. bpo: 37335
.. date: 2019-06-28-16-37-52
.. nonce: o5S2hY
.. section: Tests
Remove no longer necessary code from c locale coercion tests
..
.. bpo: 37421
.. date: 2019-06-27-00-37-59
.. nonce: rVJb3x
.. section: Tests
Fix test_shutil to no longer leak temporary files.
..
.. bpo: 37411
.. date: 2019-06-26-15-28-45
.. nonce: 5lGNhM
.. section: Tests
Fix test_wsgiref.testEnviron() to no longer depend on the environment
variables (don't fail if "X" variable is set).
..
.. bpo: 37400
.. date: 2019-06-25-16-02-43
.. nonce: cx_EWv
.. section: Tests
Fix test_os.test_chown(): use os.getgroups() rather than grp.getgrall() to
get groups. Rename also the test to test_chown_gid().
..
.. bpo: 37359
.. date: 2019-06-24-10-47-07
.. nonce: CkdtyO
.. section: Tests
Add --cleanup option to python3 -m test to remove ``test_python_*``
directories of previous failed jobs. Add "make cleantest" to run ``python3
-m test --cleanup``.
..
.. bpo: 37362
.. date: 2019-06-21-15-47-33
.. nonce: D3xppx
.. section: Tests
test_gdb no longer fails if it gets an "unexpected" message on stderr: it
now ignores stderr. The purpose of test_gdb is to test that python-gdb.py
commands work as expected, not to test gdb.
..
.. bpo: 35998
.. date: 2019-06-14-17-05-49
.. nonce: yX82oD
.. section: Tests
Avoid TimeoutError in test_asyncio: test_start_tls_server_1()
..
.. bpo: 37278
.. date: 2019-06-14-12-21-47
.. nonce: z0HUOr
.. section: Tests
Fix test_asyncio ProactorLoopCtrlC: join the thread to prevent leaking a
running thread and leaking a reference.
..
.. bpo: 37261
.. date: 2019-06-13-12-19-56
.. nonce: NuKFVo
.. section: Tests
Fix :func:`test.support.catch_unraisable_exception`: its __exit__() method
now ignores unraisable exception raised when clearing its ``unraisable``
attribute.
..
.. bpo: 37069
.. date: 2019-06-13-00-46-25
.. nonce: wdktFo
.. section: Tests
regrtest now uses :func:`sys.unraisablehook` to mark a test as "environment
altered" (ENV_CHANGED) if it emits an "unraisable exception". Moreover,
regrtest logs a warning in this case.
Use ``python3 -m test --fail-env-changed`` to catch unraisable exceptions in
tests.
..
.. bpo: 37252
.. date: 2019-06-12-14-30-29
.. nonce: 4o-uLs
.. section: Tests
Fix assertions in ``test_close`` and ``test_events_mask_overflow`` devpoll
tests.
..
.. bpo: 37169
.. date: 2019-06-07-12-23-15
.. nonce: yfXTFg
.. section: Tests
Rewrite ``_PyObject_IsFreed()`` unit tests.
..
.. bpo: 37153
.. date: 2019-06-04-18-30-39
.. nonce: 711INB
.. section: Tests
``test_venv.test_multiprocessing()`` now explicitly calls
``pool.terminate()`` to wait until the pool completes.
..
.. bpo: 34001
.. date: 2019-06-03-20-47-10
.. nonce: KvYx9z
.. section: Tests
Make test_ssl pass with LibreSSL. LibreSSL handles minimum and maximum TLS
version differently than OpenSSL.
..
.. bpo: 36919
.. date: 2019-05-28-15-41-34
.. nonce: -vGt_m
.. section: Tests
Make ``test_source_encoding.test_issue2301`` implementation independent. The
test will work now for both CPython and IronPython.
..
.. bpo: 30202
.. date: 2019-04-15-19-05-35
.. nonce: Wt7INj
.. section: Tests
Update ``test.test_importlib.test_abc`` to test ``find_spec()``.
..
.. bpo: 28009
.. date: 2019-04-11-07-59-43
.. nonce: s85urF
.. section: Tests
Modify the test_uuid logic to test when a program is available AND can be
used to obtain a MACADDR as basis for an UUID. Patch by M. Felt
..
.. bpo: 34596
.. date: 2018-09-07-01-18-27
.. nonce: r2-EGd
.. section: Tests
Fallback to a default reason when :func:`unittest.skip` is uncalled. Patch
by Naitree Zhu.
..
.. bpo: 38809
.. date: 2019-11-15-09-25-44
.. nonce: 9jwta6
.. section: Build
On Windows, build scripts will now recognize and use python.exe from an
active virtual env.
..
.. bpo: 38684
.. date: 2019-11-04-14-30-37
.. nonce: aed593
.. section: Build
Fix _hashlib build when Blake2 is disabled, but OpenSSL supports it.
..
.. bpo: 38468
.. date: 2019-10-13-16-18-24
.. nonce: buCO84
.. section: Build
Misc/python-config.in now uses ``getvar()`` for all still existing
``sysconfig.get_config_var()`` calls. Patch by Joannah Nanjekye.
..
.. bpo: 37415
.. date: 2019-10-11-15-32-58
.. nonce: D9RXrq
.. section: Build
Fix stdatomic.h header check for ICC compiler: the ICC implementation lacks
atomic_uintptr_t type which is needed by Python.
..
.. bpo: 38301
.. date: 2019-09-28-02-37-11
.. nonce: 123456
.. section: Build
In Solaris family, we must be sure to use ``-D_REENTRANT``. Patch by Jesús
Cea Avión.
..
.. bpo: 36002
.. date: 2019-09-13-14-12-36
.. nonce: Bcl4oe
.. section: Build
Locate ``llvm-profdata`` and ``llvm-ar`` binaries using ``AC_PATH_TOOL``
rather than ``AC_PATH_TARGET_TOOL``.
..
.. bpo: 37936
.. date: 2019-09-10-00-54-48
.. nonce: E7XEwu
.. section: Build
The :file:`.gitignore` file systematically keeps "rooted", with a
non-trailing slash, all the rules that are meant to apply to files in a
specific place in the repo.  Previously, when the intended file to ignore
happened to be at the root of the repo, we'd most often accidentally also
ignore files and directories with the same name anywhere in the tree.
..
.. bpo: 37760
.. date: 2019-08-24-17-39-09
.. nonce: f3jXuH
.. section: Build
The :file:`Tools/unicode/makeunicodedata.py` script, which is used for
converting information from the Unicode Character Database into generated
code and data used by the methods of :class:`str` and by the
:mod:`unicodedata` module, now handles each character's data as a
``dataclass`` with named attributes, rather than a length-18 list of
different fields.
..
.. bpo: 37936
.. date: 2019-08-24-00-29-40
.. nonce: QrORqA
.. section: Build
The :file:`.gitignore` file no longer applies to any files that are in fact
tracked in the Git repository.  Patch by Greg Price.
..
.. bpo: 37725
.. date: 2019-07-30-16-26-11
.. nonce: MkG1TT
.. section: Build
Change "clean" makefile target to also clean the program guided optimization
(PGO) data.  Previously you would have to use "make clean" and "make
profile-removal", or "make clobber".
..
.. bpo: 37707
.. date: 2019-07-29-11-36-16
.. nonce: Sm-dGk
.. section: Build
Mark some individual tests to skip when --pgo is used.  The tests marked
increase the PGO task time significantly and likely don't help improve
optimization of the final executable.
..
.. bpo: 36044
.. date: 2019-07-11-01-28-24
.. nonce: gIgfiJ
.. section: Build
Reduce the number of unit tests run for the PGO generation task.  This
speeds up the task by a factor of about 15x.  Running the full unit test
suite is slow.  This change may result in a slightly less optimized build
since not as many code branches will be executed.  If you are willing to
wait for the much slower build, the old behavior can be restored using
'./configure [..] PROFILE_TASK="-m test --pgo-extended"'.  We make no
guarantees as to which PGO task set produces a faster build.  Users who care
should run their own relevant benchmarks as results can depend on the
environment, workload, and compiler tool chain.
..
.. bpo: 37468
.. date: 2019-07-01-14-39-40
.. nonce: trbQ-_
.. section: Build
``make install`` no longer installs ``wininst-*.exe`` files used by
distutils bdist_wininst: bdist_wininst only works on Windows.
..
.. bpo: 37189
.. date: 2019-06-17-09-40-59
.. nonce: j5ebdT
.. section: Build
Many :samp:`PyRun_{XXX}()` functions like :c:func:`PyRun_String` were no longer
exported in ``libpython38.dll`` by mistake. Export them again to fix the ABI
compatibility.
..
.. bpo: 25361
.. date: 2019-03-19-22-07-37
.. nonce: XO9Bfr
.. section: Build
Enables use of SSE2 instructions in Windows 32-bit build.
..
.. bpo: 36210
.. date: 2019-03-06-18-55-10
.. nonce: fup9H2
.. section: Build
Update optional extension module detection for AIX. ossaudiodev and spwd are
not applicable for AIX, and are no longer reported as missing. 3rd-party
packaging of ncurses (with ASIS support) conflicts with officially supported
AIX curses library, so configure AIX to use libcurses.a. However, skip
trying to build _curses_panel.
patch by M Felt
..
.. bpo: 38589
.. date: 2019-10-28-10-48-16
.. nonce: V69Q1a
.. section: Windows
Fixes HTML Help shortcut when Windows is not installed to C drive
..
.. bpo: 38453
.. date: 2019-10-28-10-32-43
.. nonce: NwwatW
.. section: Windows
Ensure ntpath.realpath() correctly resolves relative paths.
..
.. bpo: 38519
.. date: 2019-10-28-05-01-29
.. nonce: dCkY66
.. section: Windows
Restores the internal C headers that were missing from the nuget.org and
Microsoft Store packages.
..
.. bpo: 38492
.. date: 2019-10-16-09-49-09
.. nonce: Te1LxC
.. section: Windows
Remove ``pythonw.exe`` dependency on the Microsoft C++ runtime.
..
.. bpo: 38344
.. date: 2019-10-05-05-50-58
.. nonce: scr2LO
.. section: Windows
Fix error message in activate.bat
..
.. bpo: 38359
.. date: 2019-10-03-08-04-14
.. nonce: wzwsl_
.. section: Windows
Ensures ``pyw.exe`` launcher reads correct registry key.
..
.. bpo: 38355
.. date: 2019-10-02-15-38-49
.. nonce: n3AWX6
.. section: Windows
Fixes ``ntpath.realpath`` failing on ``sys.executable``.
..
.. bpo: 38117
.. date: 2019-09-16-14-07-11
.. nonce: hJVf0C
.. section: Windows
Update bundled OpenSSL to 1.1.1d
..
.. bpo: 38092
.. date: 2019-09-13-14-11-42
.. nonce: x31ehI
.. section: Windows
Reduce overhead when using multiprocessing in a Windows virtual environment.
..
.. bpo: 38133
.. date: 2019-09-12-12-05-55
.. nonce: yFeRGS
.. section: Windows
Allow py.exe launcher to locate installations from the Microsoft Store and
improve display of active virtual environments.
..
.. bpo: 38114
.. date: 2019-09-11-15-24-04
.. nonce: cc0E5E
.. section: Windows
The ``pip.ini`` is no longer included in the Nuget package.
..
.. bpo: 32592
.. date: 2019-09-11-14-51-56
.. nonce: jvQMD9
.. section: Windows
Set Windows 8 as the minimum required version for API support
..
.. bpo: 36634
.. date: 2019-09-11-14-42-04
.. nonce: 8Un8ih
.. section: Windows
:func:`os.cpu_count` now returns active processors rather than maximum
processors.
..
.. bpo: 36634
.. date: 2019-09-11-12-34-31
.. nonce: xLaGgb
.. section: Windows
venv activate.bat now works when the existing variables contain double quote
characters.
..
.. bpo: 38081
.. date: 2019-09-11-10-22-01
.. nonce: 8JhzjD
.. section: Windows
Prevent error calling :func:`os.path.realpath` on ``'NUL'``.
..
.. bpo: 38087
.. date: 2019-09-10-14-21-40
.. nonce: --eIib
.. section: Windows
Fix case sensitivity in test_pathlib and test_ntpath.
..
.. bpo: 38088
.. date: 2019-09-10-14-17-25
.. nonce: FOvWSM
.. section: Windows
Fixes distutils not finding vcruntime140.dll with only the v142 toolset
installed.
..
.. bpo: 37283
.. date: 2019-09-09-12-22-23
.. nonce: 8NvOkU
.. section: Windows
Ensure command-line and unattend.xml setting override previously detected
states in Windows installer.
..
.. bpo: 38030
.. date: 2019-09-04-14-01-08
.. nonce: _USdtk
.. section: Windows
Fixes :func:`os.stat` failing for block devices on Windows
..
.. bpo: 38020
.. date: 2019-09-03-11-47-37
.. nonce: xFZ2j0
.. section: Windows
Fixes potential crash when calling :func:`os.readlink` (or indirectly
through :func:`~os.path.realpath`) on a file that is not a supported link.
..
.. bpo: 37705
.. date: 2019-08-30-15-15-22
.. nonce: 2o4NWW
.. section: Windows
Improve the implementation of ``winerror_to_errno()``.
..
.. bpo: 37549
.. date: 2019-08-22-09-04-44
.. nonce: TpKI3M
.. section: Windows
:func:`os.dup` no longer fails for standard streams on Windows 7.
..
.. bpo: 1311
.. date: 2019-08-21-12-58-18
.. nonce: BoW1wU
.. section: Windows
The ``nul`` file on Windows now returns True from :func:`~os.path.exists`
and a valid result from :func:`os.stat` with ``S_IFCHR`` set.
..
.. bpo: 9949
.. date: 2019-08-14-13-40-15
.. nonce: zW45Ks
.. section: Windows
Enable support for following symlinks in :func:`os.realpath`.
..
.. bpo: 37834
.. date: 2019-08-12-12-00-24
.. nonce: VB2QVj
.. section: Windows
Treat all name surrogate reparse points on Windows in :func:`os.lstat` and
other reparse points as regular files in :func:`os.stat`.
..
.. bpo: 36266
.. date: 2019-08-08-18-05-27
.. nonce: x4eZU3
.. section: Windows
Add the module name in the formatted error message when DLL load fail
happens during module import in ``_PyImport_FindSharedFuncptrWindows()``.
Patch by Srinivas Nyayapati.
..
.. bpo: 25172
.. date: 2019-08-06-18-09-18
.. nonce: Akreij
.. section: Windows
Trying to import the :mod:`!crypt` module on Windows will result in an
:exc:`ImportError` with a message explaining that the module isn't supported
on Windows. On other platforms, if the underlying ``_crypt`` module is not
available, the ImportError will include a message explaining the problem.
..
.. bpo: 37778
.. date: 2019-08-06-13-54-12
.. nonce: AY1XhH
.. section: Windows
Fixes the icons used for file associations to the Microsoft Store package.
..
.. bpo: 37734
.. date: 2019-08-06-09-35-12
.. nonce: EoJ9Nh
.. section: Windows
Fix use of registry values to launch Python from Microsoft Store app.
..
.. bpo: 37702
.. date: 2019-07-29-16-49-31
.. nonce: Lj2f5e
.. section: Windows
Fix memory leak on Windows in creating an SSLContext object or running
``urllib.request.urlopen('https://...')``.
..
.. bpo: 37672
.. date: 2019-07-24-14-36-28
.. nonce: uKEVHN
.. section: Windows
Switch Windows Store package's pip to use bundled :file:`pip.ini` instead of
:envvar:`PIP_USER` variable.
..
.. bpo: 10945
.. date: 2019-07-01-12-38-48
.. nonce: s0YBHG
.. section: Windows
Officially drop support for creating bdist_wininst installers on non-Windows
systems.
..
.. bpo: 37445
.. date: 2019-06-28-18-10-29
.. nonce: LsdYO6
.. section: Windows
Include the ``FORMAT_MESSAGE_IGNORE_INSERTS`` flag in ``FormatMessageW()``
calls.
..
.. bpo: 37369
.. date: 2019-06-28-09-44-08
.. nonce: 1iVpxq
.. section: Windows
Fixes path for :data:`sys.executable` when running from the Microsoft Store.
..
.. bpo: 37380
.. date: 2019-06-25-04-15-22
.. nonce: tPxjuz
.. section: Windows
Don't collect unfinished processes with ``subprocess._active`` on Windows to
cleanup later. Patch by Ruslan Kuprieiev.
..
.. bpo: 37351
.. date: 2019-06-20-12-50-32
.. nonce: asTnVW
.. section: Windows
Removes libpython38.a from standard Windows distribution.
..
.. bpo: 35360
.. date: 2019-06-18-09-05-08
.. nonce: tdqSmo
.. section: Windows
Update Windows builds to use SQLite 3.28.0.
..
.. bpo: 37267
.. date: 2019-06-13-04-15-51
.. nonce: Ygo5ef
.. section: Windows
On Windows, :func:`os.dup` no longer creates an inheritable fd when handling
a character file.
..
.. bpo: 36779
.. date: 2019-06-11-15-41-34
.. nonce: 0TMw6f
.. section: Windows
Ensure ``time.tzname`` is correct on Windows when the active code page is
set to CP_UTF7 or CP_UTF8.
..
.. bpo: 32587
.. date: 2019-05-10-15-25-44
.. nonce: -0g2O3
.. section: Windows
Make :const:`winreg.REG_MULTI_SZ` support zero-length strings.
..
.. bpo: 28269
.. date: 2019-05-05-05-23-34
.. nonce: -MOHI7
.. section: Windows
Replace use of :c:func:`strcasecmp` for the system function
:c:func:`!_stricmp`. Patch by Minmin Gong.
..
.. bpo: 36590
.. date: 2019-04-10-21-13-26
.. nonce: ZTaKcu
.. section: Windows
Add native Bluetooth RFCOMM support to socket module.
..
.. bpo: 38117
.. date: 2019-09-15-21-29-13
.. nonce: ZLsoAZ
.. section: macOS
Updated OpenSSL to 1.1.1d in macOS installer.
..
.. bpo: 38089
.. date: 2019-09-10-14-24-35
.. nonce: eedgyD
.. section: macOS
Move Azure Pipelines to latest VM versions and make macOS tests optional
..
.. bpo: 18049
.. date: 2019-07-13-15-58-18
.. nonce: MklhQQ
.. section: macOS
Increase the default stack size of threads from 5MB to 16MB on macOS, to
match the stack size of the main thread. This avoids crashes on deep
recursion in threads.
..
.. bpo: 34602
.. date: 2019-07-02-01-06-47
.. nonce: 10d4wl
.. section: macOS
Avoid test suite failures on macOS by no longer calling resource.setrlimit
to increase the process stack size limit at runtime.  The runtime change is
no longer needed since the interpreter is being built with a larger default
stack size.
..
.. bpo: 35360
.. date: 2019-06-18-08-58-30
.. nonce: -CWbfy
.. section: macOS
Update macOS installer to use SQLite 3.28.0.
..
.. bpo: 34631
.. date: 2019-06-18-00-30-40
.. nonce: vSifcv
.. section: macOS
Updated OpenSSL to 1.1.1c in macOS installer.
..
.. bpo: 26353
.. date: 2019-11-09-23-55-59
.. nonce: duYZiF
.. section: IDLE
Stop adding newline when saving an IDLE shell window.
..
.. bpo: 4630
.. date: 2019-10-28-04-48-03
.. nonce: upgjiV
.. section: IDLE
Add an option to toggle IDLE's cursor blink for shell, editor, and output
windows.  See Settings, General, Window Preferences, Cursor Blink. Patch by
Zackery Spytz.
..
.. bpo: 38598
.. date: 2019-10-26-18-16-24
.. nonce: 6kH9FY
.. section: IDLE
Do not try to compile IDLE shell or output windows
..
.. bpo: 36698
.. date: 2019-10-04-18-03-09
.. nonce: BKcmom
.. section: IDLE
IDLE no longer fails when write non-encodable characters to stderr.  It now
escapes them with a backslash, as the regular Python interpreter. Added the
``errors`` field to the standard streams.
..
.. bpo: 35379
.. date: 2019-09-17-01-28-56
.. nonce: yAECDr
.. section: IDLE
When exiting IDLE, catch any AttributeError.  One happens when
EditorWindow.close is called twice.  Printing a traceback, when IDLE is run
from a terminal, is useless and annoying.
..
.. bpo: 38183
.. date: 2019-09-16-15-04-29
.. nonce: eudCN1
.. section: IDLE
To avoid problems, test_idle ignores the user config directory. It no longer
tries to create or access .idlerc or any files within. Users must run IDLE
to discover problems with saving settings.
..
.. bpo: 38077
.. date: 2019-09-09-22-08-36
.. nonce: Mzpfe2
.. section: IDLE
IDLE no longer adds 'argv' to the user namespace when initializing it.  This
bug only affected 3.7.4 and 3.8.0b2 to 3.8.0b4.
..
.. bpo: 38041
.. date: 2019-09-05-23-12-13
.. nonce: nxmGGK
.. section: IDLE
Shell restart lines now fill the window width, always start with '=', and
avoid wrapping unnecessarily. The line will still wrap if the included file
name is long relative to the width.
..
.. bpo: 35771
.. date: 2019-09-01-10-22-55
.. nonce: tdbmbP
.. section: IDLE
To avoid occasional spurious test_idle failures on slower machines, increase
the ``hover_delay`` in test_tooltip.
..
.. bpo: 37824
.. date: 2019-08-26-00-41-53
.. nonce: YY5jAI
.. section: IDLE
Properly handle user input warnings in IDLE shell. Cease turning
SyntaxWarnings into SyntaxErrors.
..
.. bpo: 37929
.. date: 2019-08-24-22-00-33
.. nonce: jb7523
.. section: IDLE
IDLE Settings dialog now closes properly when there is no shell window.
..
.. bpo: 37902
.. date: 2019-08-21-16-02-49
.. nonce: _R_adE
.. section: IDLE
Add mousewheel scrolling for IDLE module, path, and stack browsers. Patch by
George Zhang.
..
.. bpo: 37849
.. date: 2019-08-14-09-43-15
.. nonce: -bcYF3
.. section: IDLE
Fixed completions list appearing too high or low when shown above the
current line.
..
.. bpo: 36419
.. date: 2019-08-04-17-10-01
.. nonce: TJZqOc
.. section: IDLE
Refactor IDLE autocomplete and improve testing.
..
.. bpo: 37748
.. date: 2019-08-04-15-27-50
.. nonce: 0vf6pg
.. section: IDLE
Reorder the Run menu.  Put the most common choice, Run Module, at the top.
..
.. bpo: 37692
.. date: 2019-07-27-15-14-20
.. nonce: TRHGjD
.. section: IDLE
Improve highlight config sample with example shell interaction and better
labels for shell elements.
..
.. bpo: 37628
.. date: 2019-07-26-17-51-13
.. nonce: kX4AUF
.. section: IDLE
Settings dialog no longer expands with font size.
..
.. bpo: 37627
.. date: 2019-07-20-23-33-53
.. nonce: dQhUNB
.. section: IDLE
Initialize the Customize Run dialog with the command line arguments most
recently entered before.  The user can optionally edit before submitting
them.
..
.. bpo: 33610
.. date: 2019-07-18-10-11-36
.. nonce: xYqMLg
.. section: IDLE
Fix code context not showing the correct context when first toggled on.
..
.. bpo: 37530
.. date: 2019-07-11-00-05-31
.. nonce: AuyCyD
.. section: IDLE
Optimize code context to reduce unneeded background activity. Font and
highlight changes now occur along with text changes instead of after a
random delay.
..
.. bpo: 27452
.. date: 2019-07-03-22-47-44
.. nonce: nePPLi
.. section: IDLE
Cleanup ``config.py`` by inlining ``RemoveFile`` and simplifying the
handling of ``file`` in ``CreateConfigHandlers``.
..
.. bpo: 37325
.. date: 2019-06-18-16-40-05
.. nonce: GssOf1
.. section: IDLE
Fix tab focus traversal order for help source and custom run dialogs.
..
.. bpo: 37321
.. date: 2019-06-17-16-35-30
.. nonce: zVTTGS
.. section: IDLE
Both subprocess connection error messages now refer to the 'Startup failure'
section of the IDLE doc.
..
.. bpo: 17535
.. date: 2019-06-13-01-07-20
.. nonce: K8i2St
.. section: IDLE
Add optional line numbers for IDLE editor windows.  Windows open without
line numbers unless set otherwise in the General tab of the configuration
dialog.
..
.. bpo: 26806
.. date: 2019-06-10-22-48-50
.. nonce: Zltkum
.. section: IDLE
To compensate for stack frames added by IDLE and avoid possible problems
with low recursion limits, add 30 to limits in the user code execution
process.  Subtract 30 when reporting recursion limits to make this addition
mostly transparent.
..
.. bpo: 37177
.. date: 2019-06-07-00-17-41
.. nonce: voU6pQ
.. section: IDLE
Properly 'attach' search dialogs to their main window so that they behave
like other dialogs and do not get hidden behind their main window.
..
.. bpo: 37039
.. date: 2019-06-04-23-27-33
.. nonce: FN_fBf
.. section: IDLE
Adjust "Zoom Height" to individual screens by momentarily maximizing the
window on first use with a particular screen.  Changing screen settings may
invalidate the saved height.  While a window is maximized, "Zoom Height" has
no effect.
..
.. bpo: 35763
.. date: 2019-06-04-20-36-24
.. nonce: 7XdoWz
.. section: IDLE
Make calltip reminder about '/' meaning positional-only less obtrusive by
only adding it when there is room on the first line.
..
.. bpo: 5680
.. date: 2019-06-03-00-39-29
.. nonce: VCQfOO
.. section: IDLE
Add 'Run... Customized' to the Run menu to run a module with customized
settings.  Any 'command line arguments' entered are added to sys.argv. One
can suppress the normal Shell main module restart.
..
.. bpo: 36390
.. date: 2019-03-21-08-35-00
.. nonce: OdDCGk
.. section: IDLE
Gather Format menu functions into format.py.  Combine paragraph.py,
rstrip.py, and format methods from editor.py.
..
.. bpo: 38118
.. date: 2019-10-08-15-07-52
.. nonce: pIZD6H
.. section: Tools/Demos
Update Valgrind suppression file to ignore a false alarm in
:c:func:`PyUnicode_Decode` when using GCC builtin strcmp().
..
.. bpo: 38347
.. date: 2019-10-02-09-48-42
.. nonce: 2Tq5D1
.. section: Tools/Demos
pathfix.py: Assume all files that end on '.py' are Python scripts when
working recursively.
..
.. bpo: 37803
.. date: 2019-09-12-16-15-55
.. nonce: chEizy
.. section: Tools/Demos
pdb's ``--help`` and ``--version`` long options now work.
..
.. bpo: 37942
.. date: 2019-08-24-12-11-30
.. nonce: 7H8N9a
.. section: Tools/Demos
Improve ArgumentClinic converter for floats.
..
.. bpo: 37704
.. date: 2019-07-29-13-59-19
.. nonce: xxGUz_
.. section: Tools/Demos
Remove ``Tools/scripts/h2py.py``: use cffi to access a C API in Python.
..
.. bpo: 37675
.. date: 2019-07-24-16-20-54
.. nonce: 951Cvf
.. section: Tools/Demos
2to3 now works when run from a zipped standard library.
..
.. bpo: 37034
.. date: 2019-05-27-16-13-08
.. nonce: zbTgy8
.. section: Tools/Demos
Argument Clinic now uses the argument name on errors with keyword-only
argument instead of their position. Patch contributed by Rémi Lapeyre.
..
.. bpo: 37064
.. date: 2019-05-27-15-26-12
.. nonce: k_SPW2
.. section: Tools/Demos
Add option -k to pathscript.py script: preserve shebang flags. Add option -a
to pathscript.py script: add flags.
..
.. bpo: 37633
.. date: 2019-11-04-21-10-47
.. nonce: oOGVdo
.. section: C API
Re-export some function compatibility wrappers for macros in ``pythonrun.h``.
..
.. bpo: 38644
.. date: 2019-11-04-17-59-46
.. nonce: euO_RR
.. section: C API
Provide :c:func:`Py_EnterRecursiveCall` and :c:func:`Py_LeaveRecursiveCall`
as regular functions for the limited API. Previously, there were defined as
macros, but these macros didn't work with the limited API which cannot
access ``PyThreadState.recursion_depth`` field. Remove
``_Py_CheckRecursionLimit`` from the stable ABI.
..
.. bpo: 38650
.. date: 2019-10-30-22-03-03
.. nonce: 0pi8zt
.. section: C API
The global variable :c:data:`PyStructSequence_UnnamedField` is now a
constant and refers to a constant string.
..
.. bpo: 38540
.. date: 2019-10-21-09-24-03
.. nonce: 314N_T
.. section: C API
Fixed possible leak in :c:func:`PyArg_Parse` and similar functions for
format units ``"es#"`` and ``"et#"`` when the macro
:c:macro:`PY_SSIZE_T_CLEAN` is not defined.
..
.. bpo: 38395
.. date: 2019-10-08-01-23-24
.. nonce: MJ6Ey9
.. section: C API
Fix a crash in :class:`weakref.proxy` objects due to incorrect lifetime
management when calling some associated methods that may delete the last
reference to object being referenced by the proxy. Patch by Pablo Galindo.
..
.. bpo: 36389
.. date: 2019-10-07-17-15-09
.. nonce: hFX_jD
.. section: C API
The ``_PyObject_CheckConsistency()`` function is now also available in
release mode. For example, it can be used to debug a crash in the
``visit_decref()`` function of the GC.
..
.. bpo: 38266
.. date: 2019-10-03-12-53-53
.. nonce: 0FIC1q
.. section: C API
Revert the removal of PyThreadState_DeleteCurrent() with documentation.
..
.. bpo: 38303
.. date: 2019-09-30-16-53-30
.. nonce: YoIs0M
.. section: C API
Update audioop extension module to use the stable ABI (PEP-384). Patch by
Tyler Kieft.
..
.. bpo: 38234
.. date: 2019-09-24-17-09-48
.. nonce: d0bhEA
.. section: C API
:c:func:`!Py_SetPath` now sets :data:`sys.executable` to the program full
path (:c:func:`!Py_GetProgramFullPath`) rather than to the program name
(:c:func:`!Py_GetProgramName`).
..
.. bpo: 38234
.. date: 2019-09-20-17-22-41
.. nonce: ZbquVK
.. section: C API
Python ignored arguments passed to :c:func:`!Py_SetPath`,
:c:func:`!Py_SetPythonHome` and :c:func:`!Py_SetProgramName`: fix Python
initialization to use specified arguments.
..
.. bpo: 38205
.. date: 2019-09-19-18-26-29
.. nonce: Db1OJL
.. section: C API
The :c:func:`Py_UNREACHABLE` macro now calls :c:func:`Py_FatalError`.
..
.. bpo: 38140
.. date: 2019-09-13-01-24-47
.. nonce: y59qaO
.. section: C API
Make dict and weakref offsets opaque for C heap types by passing the offsets
through PyMemberDef
..
.. bpo: 15088
.. date: 2019-09-05-14-17-21
.. nonce: plt8Em
.. section: C API
The C function ``PyGen_NeedsFinalizing`` has been removed. It was not
documented, tested or used anywhere within CPython after the implementation
of :pep:`442`. Patch by Joannah Nanjekye. (Patch by Joannah Nanjekye)
..
.. bpo: 36763
.. date: 2019-08-23-18-45-11
.. nonce: q3Kh8Z
.. section: C API
Options added by ``PySys_AddXOption()`` are now handled the same way than
``PyConfig.xoptions`` and command line ``-X`` options.
..
.. bpo: 37926
.. date: 2019-08-23-11-35-55
.. nonce: hnI5IQ
.. section: C API
Fix a crash in ``PySys_SetArgvEx(0, NULL, 0)``.
..
.. bpo: 37879
.. date: 2019-08-17-13-50-21
.. nonce: CZeUem
.. section: C API
Fix subtype_dealloc to suppress the type decref when the base type is a C
heap type
..
.. bpo: 37645
.. date: 2019-07-21-21-08-47
.. nonce: 4DcUaI
.. section: C API
Add :c:func:`!_PyObject_FunctionStr` to get a user-friendly string
representation of a function-like object. Patch by Jeroen Demeyer.
..
.. bpo: 29548
.. date: 2019-07-17-09-50-50
.. nonce: 5wIptQ
.. section: C API
The functions ``PyEval_CallObject``, ``PyEval_CallFunction``,
``PyEval_CallMethod`` and ``PyEval_CallObjectWithKeywords`` are deprecated.
Use :c:func:`PyObject_Call` and its variants instead.
..
.. bpo: 37151
.. date: 2019-07-16-11-02-00
.. nonce: YKfuNA
.. section: C API
``PyCFunction_Call`` is now a deprecated alias of :c:func:`PyObject_Call`.
..
.. bpo: 37540
.. date: 2019-07-10-12-27-28
.. nonce: E8Z773
.. section: C API
The vectorcall protocol now requires that the caller passes only strings as
keyword names.
..
.. bpo: 37207
.. date: 2019-07-07-10-37-07
.. nonce: SlVNky
.. section: C API
The vectorcall protocol is now enabled for ``type`` objects: set
``tp_vectorcall`` to a vectorcall function to be used instead of ``tp_new``
and ``tp_init`` when calling the class itself.
..
.. bpo: 21120
.. date: 2019-07-06-23-56-47
.. nonce: lXHqlT
.. section: C API
Exclude Python-ast.h, ast.h and asdl.h from the limited API.
..
.. bpo: 37483
.. date: 2019-07-02-15-42-37
.. nonce: vftT4f
.. section: C API
Add new function ``_PyObject_CallOneArg`` for calling an object with one
positional argument.
..
.. bpo: 36763
.. date: 2019-06-28-15-49-16
.. nonce: zrmgki
.. section: C API
Add :c:func:`PyConfig_SetWideStringList` function.
..
.. bpo: 37337
.. date: 2019-06-19-12-06-31
.. nonce: gXIGyU
.. section: C API
Add fast functions for calling methods:
:c:func:`!_PyObject_VectorcallMethod`, :c:func:`!_PyObject_CallMethodNoArgs`
and :c:func:`!_PyObject_CallMethodOneArg`.
..
.. bpo: 28805
.. date: 2019-06-14-14-03-51
.. nonce: qZC0N_
.. section: C API
The :c:macro:`METH_FASTCALL` calling convention has been documented.
..
.. bpo: 37221
.. date: 2019-06-11-02-50-38
.. nonce: 4tClQT
.. section: C API
The new function :c:func:`!PyCode_NewWithPosOnlyArgs` allows to create code
objects like :c:func:`!PyCode_New`, but with an extra *posonlyargcount*
parameter for indicating the number of positonal-only arguments.
..
.. bpo: 37215
.. date: 2019-06-10-15-32-34
.. nonce: yzoNyU
.. section: C API
Fix dtrace issue introduce by bpo-36842
..
.. bpo: 37194
.. date: 2019-06-07-14-03-52
.. nonce: uck7MD
.. section: C API
Add a new public :c:func:`PyObject_CallNoArgs` function to the C API: call a
callable Python object without any arguments. It is the most efficient way
to call a callback without any argument. On x86-64, for example,
``PyObject_CallFunctionObjArgs(func, NULL)`` allocates 960 bytes on the
stack per call, whereas ``PyObject_CallNoArgs(func)`` only allocates 624
bytes per call.
..
.. bpo: 37170
.. date: 2019-06-06-08-47-04
.. nonce: hO_fpM
.. section: C API
Fix the cast on error in :c:func:`PyLong_AsUnsignedLongLongMask()`.
..
.. bpo: 35381
.. date: 2019-01-18-17-05-26
.. nonce: 9CbeW3
.. section: C API
Convert posixmodule.c statically allocated types ``DirEntryType`` and
``ScandirIteratorType`` to heap-allocated types.
..
.. bpo: 34331
.. date: 2018-08-04-00-59-44
.. nonce: iaUkmU
.. section: C API
Use singular/plural noun in error message when instantiating an abstract
class with non-overridden abstract method(s).

.. bpo: 29723
.. date: 9895
.. nonce: M5omgP
.. release date: 2017-03-21
.. section: Core and Builtins
The ``sys.path[0]`` initialization change for bpo-29139 caused a regression
by revealing an inconsistency in how sys.path is initialized when executing
``__main__`` from a zipfile, directory, or other import location. The
interpreter now consistently avoids ever adding the import location's parent
directory to ``sys.path``, and ensures no other ``sys.path`` entries are
inadvertently modified when inserting the import location named on the
command line.
..
.. bpo: 27593
.. date: 9894
.. nonce: nk7Etn
.. section: Build
fix format of git information used in sys.version
..
.. bpo: 0
.. date: 9893
.. nonce: usKKNQ
.. section: Build
Fix incompatible comment in python.h

.. bpo: 42103
.. date: 2020-10-23-19-19-30
.. nonce: cILT66
.. release date: 2020-11-03
.. section: Security
Prevented potential DoS attack via CPU and RAM exhaustion when processing
malformed Apple Property List files in binary format.
..
.. bpo: 42051
.. date: 2020-10-19-10-56-27
.. nonce: EU_B7u
.. section: Security
The :mod:`plistlib` module no longer accepts entity declarations in XML
plist files to avoid XML vulnerabilities. This should not affect users as
entity declarations are not used in regular plist files.
..
.. bpo: 42236
.. date: 2020-11-01-21-21-38
.. nonce: MPx-NK
.. section: Core and Builtins
If the ``nl_langinfo(CODESET)`` function returns an empty string, Python now
uses UTF-8 as the filesystem encoding. Patch by Victor Stinner.
..
.. bpo: 42218
.. date: 2020-10-31-17-50-23
.. nonce: Dp_Z3v
.. section: Core and Builtins
Fixed a bug in the PEG parser that was causing crashes in debug mode. Now
errors are checked in left-recursive rules to avoid cases where such errors
do not get handled in time and appear as long-distance crashes in other
places.
..
.. bpo: 42214
.. date: 2020-10-30-22-16-30
.. nonce: lXskM_
.. section: Core and Builtins
Fixed a possible crash in the PEG parser when checking for the '!=' token in
the ``barry_as_flufl`` rule. Patch by Pablo Galindo.
..
.. bpo: 42206
.. date: 2020-10-30-13-11-01
.. nonce: xxssR8
.. section: Core and Builtins
Propagate and raise the errors caused by :c:func:`PyAST_Validate` in the
parser.
..
.. bpo: 41796
.. date: 2020-10-29-12-49-08
.. nonce: tkGdHq
.. section: Core and Builtins
The :mod:`ast` module internal state is now per interpreter. Patch by Victor
Stinner.
..
.. bpo: 42143
.. date: 2020-10-27-21-34-05
.. nonce: N6KXUO
.. section: Core and Builtins
Fix handling of errors during creation of ``PyFunctionObject``, which
resulted in operations on uninitialized memory. Patch by Yonatan
Goldschmidt.
..
.. bpo: 41659
.. date: 2020-10-27-18-32-49
.. nonce: d4a-8o
.. section: Core and Builtins
Fix a bug in the parser, where a curly brace following a ``primary`` didn't
fail immediately. This led to invalid expressions like ``a {b}`` to throw a
:exc:`SyntaxError` with a wrong offset, or invalid expressions ending with a
curly brace like ``a {`` to not fail immediately in the REPL.
..
.. bpo: 42150
.. date: 2020-10-25-21-14-18
.. nonce: b70u_T
.. section: Core and Builtins
Fix possible buffer overflow in the new parser when checking for
continuation lines. Patch by Pablo Galindo.
..
.. bpo: 42123
.. date: 2020-10-23-02-43-24
.. nonce: 64gJWC
.. section: Core and Builtins
Run the parser two times. On the first run, disable all the rules that only
generate better error messages to gain performance. If there's a parse
failure, run the parser a second time with those enabled.
..
.. bpo: 42093
.. date: 2020-10-20-04-24-07
.. nonce: ooZZNh
.. section: Core and Builtins
The ``LOAD_ATTR`` instruction now uses new "per opcode cache" mechanism and
it is about 36% faster now. Patch by Pablo Galindo and Yury Selivanov.
..
.. bpo: 42030
.. date: 2020-10-15-21-55-32
.. nonce: PmU2CA
.. section: Core and Builtins
Support for the legacy AIX-specific shared library loading support has been
removed. All versions of AIX since 4.3 have supported and defaulted to using
the common Unix mechanism instead.
..
.. bpo: 41984
.. date: 2020-10-14-16-19-43
.. nonce: SEtKMr
.. section: Core and Builtins
The garbage collector now tracks all user-defined classes. Patch by Brandt
Bucher.
..
.. bpo: 41993
.. date: 2020-10-10-13-53-52
.. nonce: YMzixQ
.. section: Core and Builtins
Fixed potential issues with removing not completely initialized module from
``sys.modules`` when import fails.
..
.. bpo: 41979
.. date: 2020-10-09-10-55-50
.. nonce: ImXIk2
.. section: Core and Builtins
Star-unpacking is now allowed for with item's targets in the PEG parser.
..
.. bpo: 41974
.. date: 2020-10-08-09-58-19
.. nonce: 8B-q8O
.. section: Core and Builtins
Removed special methods ``__int__``, ``__float__``, ``__floordiv__``,
``__mod__``, ``__divmod__``, ``__rfloordiv__``, ``__rmod__`` and
``__rdivmod__`` of the :class:`complex` class.  They always raised a
:exc:`TypeError`.
..
.. bpo: 41902
.. date: 2020-10-02-13-32-05
.. nonce: ZKTxzW
.. section: Core and Builtins
Micro optimization when compute :c:member:`~PySequenceMethods.sq_item` and
:c:member:`~PyMappingMethods.mp_subscript` of :class:`range`. Patch by
Donghee Na.
..
.. bpo: 41894
.. date: 2020-10-02-11-35-33
.. nonce: ffmtOt
.. section: Core and Builtins
When loading a native module and a load failure occurs, prevent a possible
UnicodeDecodeError when not running in a UTF-8 locale by decoding the load
error message using the current locale's encoding.
..
.. bpo: 41902
.. date: 2020-10-01-22-44-23
.. nonce: iLoMVF
.. section: Core and Builtins
Micro optimization for range.index if step is 1. Patch by Donghee Na.
..
.. bpo: 41435
.. date: 2020-08-07-13-42-48
.. nonce: qPWjJA
.. section: Library
Add ``sys._current_exceptions()`` function to retrieve a dictionary mapping
each thread's identifier to the topmost exception currently active in that
thread at the time the function is called.
..
.. bpo: 38605
.. date: 2020-05-27-16-08-16
.. nonce: rcs2uK
.. section: Core and Builtins
Enable ``from __future__ import annotations`` (:pep:`563`) by default. The
values found in :attr:`~object.__annotations__` dicts are now strings, for
example ``{"x": "int"}`` instead of ``{"x": int}``.
..
.. bpo: 35455
.. date: 2020-11-02-14-10-48
.. nonce: Q1xTIo
.. section: Library
On Solaris, :func:`~time.thread_time` is now implemented with
``gethrvtime()`` because ``clock_gettime(CLOCK_THREAD_CPUTIME_ID)`` is not
always available. Patch by Jakub Kulik.
..
.. bpo: 42233
.. date: 2020-11-02-01-31-15
.. nonce: YxRj-h
.. section: Library
The :func:`repr` of :mod:`typing` types containing :ref:`Generic Alias Types
<types-genericalias>` previously did not show the parameterized types in the
``GenericAlias``.  They have now been changed to do so.
..
.. bpo: 29566
.. date: 2020-10-31-13-28-36
.. nonce: 6aDbty
.. section: Library
``binhex.binhex()`` consistently writes macOS 9 line endings.
..
.. bpo: 26789
.. date: 2020-10-31-01-16-49
.. nonce: 9BdNAt
.. section: Library
The :class:`logging.FileHandler` class now keeps a reference to the builtin
:func:`open` function to be able to open or reopen the file during Python
finalization. Fix errors like: ``NameError: name 'open' is not defined``.
Patch by Victor Stinner.
..
.. bpo: 42157
.. date: 2020-10-26-23-29-16
.. nonce: 4wuwTe
.. section: Library
Removed the ``unicodedata.ucnhash_CAPI`` attribute which was an internal
PyCapsule object. The related private ``_PyUnicode_Name_CAPI`` structure was
moved to the internal C API. Patch by Victor Stinner.
..
.. bpo: 42157
.. date: 2020-10-26-19-08-07
.. nonce: Bdpa04
.. section: Library
Convert the :mod:`unicodedata` extension module to the multiphase
initialization API (:pep:`489`) and convert the ``unicodedata.UCD`` static
type to a heap type. Patch by Mohamed Koubaa and Victor Stinner.
..
.. bpo: 42146
.. date: 2020-10-25-19-25-02
.. nonce: 6A8uvS
.. section: Library
Fix memory leak in :func:`subprocess.Popen` in case an uid (gid) specified
in ``user`` (``group``, ``extra_groups``) overflows ``uid_t`` (``gid_t``).
..
.. bpo: 42103
.. date: 2020-10-23-19-20-14
.. nonce: C5obK2
.. section: Library
:exc:`~plistlib.InvalidFileException` and :exc:`RecursionError` are now the
only errors caused by loading malformed binary Plist file (previously
ValueError and TypeError could be raised in some specific cases).
..
.. bpo: 41490
.. date: 2020-10-23-08-54-47
.. nonce: -Yk6OD
.. section: Library
In ``importlib.resources``, ``.path`` method is more aggressive about
releasing handles to zipfile objects early, enabling use-cases like certifi
to leave the context open but delete the underlying zip file.
..
.. bpo: 41052
.. date: 2020-10-21-23-45-02
.. nonce: 3N7J2J
.. section: Library
Pickling heap types implemented in C with protocols 0 and 1 raises now an
error instead of producing incorrect data.
..
.. bpo: 42089
.. date: 2020-10-19-16-53-19
.. nonce: R1dthW
.. section: Library
In ``importlib.metadata.PackageNotFoundError``, make reference to the
package metadata being missing to improve the user experience.
..
.. bpo: 41491
.. date: 2020-10-19-14-02-09
.. nonce: d1BUWH
.. section: Library
plistlib: fix parsing XML plists with hexadecimal integer values
..
.. bpo: 42065
.. date: 2020-10-17-23-17-18
.. nonce: 85BsRA
.. section: Library
Fix an incorrectly formatted error from :meth:`!_codecs.charmap_decode` when
called with a mapped value outside the range of valid Unicode code points.
PR by Max Bernstein.
..
.. bpo: 41966
.. date: 2020-10-17-07-52-53
.. nonce: gwEQRZ
.. section: Library
Fix pickling pure Python :class:`datetime.time` subclasses. Patch by Dean
Inwood.
..
.. bpo: 19270
.. date: 2020-10-16-22-48-01
.. nonce: jd_gkA
.. section: Library
:meth:`sched.scheduler.cancel` will now cancel the correct event, if two
events with same priority are scheduled for the same time. Patch by Bar
Harel.
..
.. bpo: 28660
.. date: 2020-10-16-16-08-04
.. nonce: eX9pvD
.. section: Library
:func:`textwrap.wrap` now attempts to break long words after hyphens when
``break_long_words=True`` and ``break_on_hyphens=True``.
..
.. bpo: 35823
.. date: 2020-10-16-07-45-35
.. nonce: SNQo56
.. section: Library
Use ``vfork()`` instead of ``fork()`` for :func:`subprocess.Popen` on Linux
to improve performance in cases where it is deemed safe.
..
.. bpo: 42043
.. date: 2020-10-15-17-20-37
.. nonce: OS0p_v
.. section: Library
Add support for ``zipfile.Path`` inheritance. ``zipfile.Path.is_file()`` now
returns False for non-existent names. ``zipfile.Path`` objects now expose a
``.filename`` attribute and rely on that to resolve ``.name`` and
``.parent`` when the ``Path`` object is at the root of the zipfile.
..
.. bpo: 42021
.. date: 2020-10-12-21-21-24
.. nonce: 8yv_8-
.. section: Library
Fix possible ref leaks in :mod:`sqlite3` module init.
..
.. bpo: 39101
.. date: 2020-10-11-21-43-03
.. nonce: -I49Pm
.. section: Library
Fixed tests using IsolatedAsyncioTestCase from hanging on BaseExceptions.
..
.. bpo: 41976
.. date: 2020-10-08-18-22-28
.. nonce: Svm0wb
.. section: Library
Fixed a bug that was causing :func:`ctypes.util.find_library` to return
``None`` when triying to locate a library in an environment when gcc>=9 is
available and ``ldconfig`` is not. Patch by Pablo Galindo
..
.. bpo: 41943
.. date: 2020-10-07-18-36-03
.. nonce: Pt55fT
.. section: Library
Fix bug where TestCase.assertLogs doesn't correctly filter messages by
level.
..
.. bpo: 41923
.. date: 2020-10-03-23-14-50
.. nonce: Buonw9
.. section: Library
Implement :pep:`613`, introducing :data:`typing.TypeAlias` annotation.
..
.. bpo: 41905
.. date: 2020-10-01-21-11-03
.. nonce: _JpjR4
.. section: Library
A new function in abc: *update_abstractmethods* to re-calculate an abstract
class's abstract status. In addition, *dataclass* has been changed to call
this function.
..
.. bpo: 23706
.. date: 2020-09-30-11-05-11
.. nonce: dHTGjF
.. section: Library
Added *newline* parameter to ``pathlib.Path.write_text()``.
..
.. bpo: 41876
.. date: 2020-09-29-16-23-54
.. nonce: QicdDU
.. section: Library
Tkinter font class repr uses font name
..
.. bpo: 41831
.. date: 2020-09-22-11-07-50
.. nonce: k-Eop_
.. section: Library
``str()`` for the ``type`` attribute of the ``tkinter.Event`` object always
returns now the numeric code returned by Tk instead of the name of the event
type.
..
.. bpo: 39337
.. date: 2020-09-13-02-02-18
.. nonce: L3NXTt
.. section: Library
:func:`encodings.normalize_encoding` now ignores non-ASCII characters.
..
.. bpo: 41747
.. date: 2020-09-08-23-41-29
.. nonce: M6wLKv
.. section: Library
Ensure all methods that generated from :func:`dataclasses.dataclass` objects
now have the proper ``__qualname__`` attribute referring to the class they
belong to. Patch by Batuhan Taskaya.
..
.. bpo: 30681
.. date: 2020-09-04-17-33-04
.. nonce: LR4fnY
.. section: Library
Handle exceptions caused by unparsable date headers when using email
"default" policy.  Patch by Tim Bell, Georges Toth
..
.. bpo: 41586
.. date: 2020-08-19-08-32-13
.. nonce: IYjmjK
.. section: Library
Add F_SETPIPE_SZ and F_GETPIPE_SZ to fcntl module. Allow setting pipesize on
subprocess.Popen.
..
.. bpo: 41229
.. date: 2020-07-19-20-10-41
.. nonce: p8rJa2
.. section: Library
Add ``contextlib.aclosing`` for deterministic cleanup of async generators
which is analogous to ``contextlib.closing`` for non-async generators. Patch
by Joongi Kim and John Belmonte.
..
.. bpo: 16396
.. date: 2020-07-08-09-45-00
.. nonce: z8o8Pn
.. section: Library
Allow ``ctypes.wintypes`` to be imported on non-Windows systems.
..
.. bpo: 4356
.. date: 2020-05-31-10-48-47
.. nonce: P8kXqp
.. section: Library
Add a key function to the bisect module.
..
.. bpo: 40592
.. date: 2020-05-14-16-01-34
.. nonce: Cmk855
.. section: Library
:func:`shutil.which` now ignores empty entries in :envvar:`PATHEXT` instead
of treating them as a match.
..
.. bpo: 40492
.. date: 2020-05-04-12-16-00
.. nonce: ONk9Na
.. section: Library
Fix ``--outfile`` for :mod:`!cProfile` / :mod:`!profile` not writing the
output file in the original directory when the program being profiled
changes the working directory.  PR by Anthony Sottile.
..
.. bpo: 34204
.. date: 2020-04-21-17-18-33
.. nonce: 9wXTtY
.. section: Library
The :mod:`shelve` module now uses :const:`pickle.DEFAULT_PROTOCOL` by default
instead of :mod:`pickle` protocol ``3``.
..
.. bpo: 27321
.. date: 2020-01-19-18-40-26
.. nonce: 8e6SpM
.. section: Library
Fixed KeyError exception when flattening an email to a string attempts to
replace a non-existent Content-Transfer-Encoding header.
..
.. bpo: 38976
.. date: 2019-12-05-05-22-49
.. nonce: 5MG7Uu
.. section: Library
The :mod:`http.cookiejar` module now supports the parsing of cookies in
CURL-style cookiejar files through MozillaCookieJar on all platforms.
Previously, such cookie entries would be silently ignored when loading a
cookiejar with such entries.
Additionally, the HTTP Only attribute is persisted in the object, and will
be correctly written to file if the MozillaCookieJar object is subsequently
dumped.
..
.. bpo: 42061
.. date: 2020-10-28-21-39-45
.. nonce: _x-0sg
.. section: Documentation
Document __format__ functionality for IP addresses.
..
.. bpo: 41910
.. date: 2020-10-21-14-40-54
.. nonce: CzBMit
.. section: Documentation
Document the default implementation of ``object.__eq__``.
..
.. bpo: 42010
.. date: 2020-10-21-02-21-14
.. nonce: 76vJ0u
.. section: Documentation
Clarify that subscription expressions are also valid for certain
:term:`classes <class>` and :term:`types <type>` in the standard library,
and for user-defined classes and types if the classmethod
:meth:`__class_getitem__` is provided.
..
.. bpo: 41805
.. date: 2020-10-10-01-36-37
.. nonce: l-CGv5
.. section: Documentation
Documented :ref:`generic alias type <types-genericalias>` and
:data:`types.GenericAlias`. Also added an entry in glossary for
:term:`generic types <generic type>`.
..
.. bpo: 39693
.. date: 2020-02-24-09-02-05
.. nonce: QXw0Fm
.. section: Documentation
Fix tarfile's extractfile documentation
..
.. bpo: 39416
.. date: 2020-01-22-05-14-53
.. nonce: uYjhEm
.. section: Documentation
Document some restrictions on the default string representations of numeric
classes.
..
.. bpo: 41739
.. date: 2020-10-12-00-11-47
.. nonce: wSCc4K
.. section: Tests
Fix test_logging.test_race_between_set_target_and_flush(): the test now
waits until all threads complete to avoid leaking running threads.
..
.. bpo: 41970
.. date: 2020-10-08-14-00-17
.. nonce: aZ8QFf
.. section: Tests
Avoid a test failure in ``test_lib2to3`` if the module has already imported
at the time the test executes. Patch by Pablo Galindo.
..
.. bpo: 41944
.. date: 2020-10-05-17-43-46
.. nonce: rf1dYb
.. section: Tests
Tests for CJK codecs no longer call ``eval()`` on content received via HTTP.
..
.. bpo: 41306
.. date: 2020-08-03-13-44-37
.. nonce: VDoWXI
.. section: Tests
Fixed a failure in ``test_tk.test_widgets.ScaleTest`` happening when
executing the test with Tk 8.6.10.
..
.. bpo: 38980
.. date: 2020-10-21-18-31-54
.. nonce: xz7BNd
.. section: Build
Add ``-fno-semantic-interposition`` to both the compile and link line when
building with ``--enable-optimizations``. Patch by Victor Stinner and Pablo
Galindo.
..
.. bpo: 38439
.. date: 2020-10-20-13-19-42
.. nonce: eMLi-t
.. section: Windows
Updates the icons for IDLE in the Windows Store package.
..
.. bpo: 38252
.. date: 2020-10-18-18-43-45
.. nonce: 7Nlepg
.. section: Windows
Use 8-byte step to detect ASCII sequence in 64-bit Windows build.
..
.. bpo: 39107
.. date: 2020-09-24-23-09-40
.. nonce: GbUZvD
.. section: Windows
Update Tcl and Tk to 8.6.10 in Windows installer.
..
.. bpo: 41557
.. date: 2020-08-26-09-35-06
.. nonce: vt00cQ
.. section: Windows
Update Windows installer to use SQLite 3.33.0.
..
.. bpo: 38324
.. date: 2020-05-30-02-46-43
.. nonce: 476M-5
.. section: Windows
Avoid Unicode errors when accessing certain locale data on Windows.
..
.. bpo: 41471
.. date: 2020-10-19-12-25-19
.. nonce: gwA7un
.. section: macOS
Ignore invalid prefix lengths in system proxy excludes.
..
.. bpo: 33987
.. date: 2020-10-24-21-27-37
.. nonce: fIh9JL
.. section: IDLE
Mostly finish using ttk widgets, mainly for editor, settings, and searches.
Some patches by Mark Roseman.
..
.. bpo: 40511
.. date: 2020-06-16-12-16-13
.. nonce: XkihpM
.. section: IDLE
Typing opening and closing parentheses inside the parentheses of a function
call will no longer cause unnecessary "flashing" off and on of an existing
open call-tip, e.g. when typed in a string literal.
..
.. bpo: 38439
.. date: 2020-04-22-09-37-40
.. nonce: ieXL-c
.. section: IDLE
Add a 256×256 pixel IDLE icon to the Windows .ico file. Created by Andrew
Clover. Remove the low-color gif variations from the .ico file.
..
.. bpo: 42157
.. date: 2020-10-16-10-47-17
.. nonce: e3BcPM
.. section: C API
The private ``_PyUnicode_Name_CAPI`` structure of the PyCapsule API
``unicodedata.ucnhash_CAPI`` has been moved to the internal C API. Patch by
Victor Stinner.
..
.. bpo: 42015
.. date: 2020-10-12-20-13-58
.. nonce: X4H2_V
.. section: C API
Fix potential crash in deallocating method objects when dynamically
allocated :c:type:`PyMethodDef`'s lifetime is managed through the ``self`` argument
of a :c:type:`PyCFunction`.
..
.. bpo: 40423
.. date: 2020-10-11-19-17-44
.. nonce: GsmgEj
.. section: C API
The :mod:`subprocess` module and ``os.closerange`` will now use the
``close_range(low, high, flags)`` syscall when it is available for more
efficient closing of ranges of descriptors.
..
.. bpo: 41845
.. date: 2020-10-11-05-05-53
.. nonce: ZFvuQM
.. section: C API
:c:func:`PyObject_GenericGetDict` is available again in the limited API when
targeting 3.10 or later.
..
.. bpo: 40422
.. date: 2020-10-10-14-05-24
.. nonce: sh8IDY
.. section: C API
Add ``_Py_closerange`` function to provide performant closing of a range of
file descriptors.
..
.. bpo: 41986
.. date: 2020-10-09-22-50-46
.. nonce: JUPE59
.. section: C API
:c:data:`!Py_FileSystemDefaultEncodeErrors` and :c:data:`!Py_UTF8Mode` are
available again in limited API.
..
.. bpo: 41756
.. date: 2020-09-28-14-31-07
.. nonce: ZZ5wJG
.. section: C API
Add ``PyIter_Send`` function to allow sending value into
generator/coroutine/iterator without raising StopIteration exception to
signal return.
..
.. bpo: 41784
.. date: 2020-09-14-10-17-00
.. nonce: Yl4gI2
.. section: C API
Added ``PyUnicode_AsUTF8AndSize`` to the limited C API.

.. bpo: 25709
.. date: 9452
.. nonce: OPX2TS
.. release date: 2015-12-06
.. section: Core and Builtins
Fixed problem with in-place string concatenation and utf-8 cache.
..
.. bpo: 25715
.. date: 9451
.. nonce: 3LLYLj
.. section: Windows
Python 3.5.1 installer shows wrong upgrade path and incorrect logic for
launcher detection.

.. bpo: 42988
.. date: 2021-03-24-14-16-56
.. nonce: P2aNco
.. release date: 2021-04-05
.. section: Security
:cve:`2021-3426`: Remove the ``getfile`` feature of the :mod:`pydoc` module
which could be abused to read arbitrary files on the disk (directory
traversal vulnerability). Moreover, even source code of Python modules can
contain sensitive data like passwords. Vulnerability reported by David
Schwörer.
..
.. bpo: 43285
.. date: 2021-03-13-03-48-14
.. nonce: g-Hah3
.. section: Security
:mod:`ftplib` no longer trusts the IP address value returned from the server
in response to the PASV command by default.  This prevents a malicious FTP
server from using the response to probe IPv4 address and port combinations
on the client network.
Code that requires the former vulnerable behavior may set a
``trust_server_pasv_ipv4_address`` attribute on their :class:`ftplib.FTP`
instances to ``True`` to re-enable it.
..
.. bpo: 43439
.. date: 2021-03-08-23-06-07
.. nonce: 5U3lXm
.. section: Security
Add audit hooks for :func:`gc.get_objects`, :func:`gc.get_referrers` and
:func:`gc.get_referents`. Patch by Pablo Galindo.
..
.. bpo: 27129
.. date: 2021-04-03-22-04-46
.. nonce: u_ehHb
.. section: Core and Builtins
Update CPython bytecode magic number.
..
.. bpo: 43672
.. date: 2021-03-31-09-12-54
.. nonce: jTT5uG
.. section: Core and Builtins
Raise ImportWarning when calling find_loader().
..
.. bpo: 43660
.. date: 2021-03-29-19-50-34
.. nonce: scTgag
.. section: Core and Builtins
Fix crash that happens when replacing ``sys.stderr`` with a callable that
can remove the object while an exception is being printed. Patch by Pablo
Galindo.
..
.. bpo: 27129
.. date: 2021-03-29-16-20-29
.. nonce: BF03A5
.. section: Core and Builtins
The bytecode interpreter uses instruction, rather byte, offsets internally.
This reduces the number of EXTENDED_ARG instructions needed and streamlines
instruction dispatch a bit.
..
.. bpo: 40645
.. date: 2021-03-29-11-55-06
.. nonce: PhaT-B
.. section: Library
Fix reference leak in the :mod:`!_hashopenssl` extension. Patch by Pablo
Galindo.
..
.. bpo: 42134
.. date: 2021-03-26-17-30-19
.. nonce: G4Sjxg
.. section: Core and Builtins
Calls to find_module() by the import system now raise ImportWarning.
..
.. bpo: 41064
.. date: 2021-03-24-00-32-20
.. nonce: _H0K_g
.. section: Core and Builtins
Improve the syntax error for invalid usage of double starred elements ('**')
in f-strings. Patch by Pablo Galindo.
..
.. bpo: 43575
.. date: 2021-03-21-12-26-32
.. nonce: pl-nSg
.. section: Core and Builtins
Speed up calls to ``map()`` by using the :pep:`590` ``vectorcall`` calling
convention. Patch by Donghee Na.
..
.. bpo: 42137
.. date: 2021-03-20-19-54-47
.. nonce: A8aQvj
.. section: Core and Builtins
The import system now prefers using ``__spec__`` for ``ModuleType.__repr__``
over ``module_repr()``.
..
.. bpo: 43452
.. date: 2021-03-20-01-21-37
.. nonce: tDVJkc
.. section: Core and Builtins
Added micro-optimizations to ``_PyType_Lookup()`` to improve cache lookup
performance in the common case of cache hits.
..
.. bpo: 43555
.. date: 2021-03-19-22-49-40
.. nonce: ZmhYSA
.. section: Core and Builtins
Report the column offset for :exc:`SyntaxError` for invalid line
continuation characters. Patch by Pablo Galindo.
..
.. bpo: 43517
.. date: 2021-03-16-17-12-54
.. nonce: zAo6Ws
.. section: Core and Builtins
Fix misdetection of circular imports when using ``from pkg.mod import
attr``, which caused false positives in non-trivial multi-threaded code.
..
.. bpo: 43497
.. date: 2021-03-15-07-50-30
.. nonce: Uc5ZCJ
.. section: Core and Builtins
Emit SyntaxWarnings for assertions with tuple constants, this is a
regression introduced in python3.7
..
.. bpo: 39316
.. date: 2021-03-14-16-44-50
.. nonce: Ns3a_F
.. section: Core and Builtins
Tracing now has correct line numbers for attribute accesses when the
attribute is on a different line from the object. Improves debugging and
profiling for multi-line method chains.
..
.. bpo: 35883
.. date: 2021-03-13-13-57-21
.. nonce: UyGpdG
.. section: Core and Builtins
Python no longer fails at startup with a fatal error if a command line
argument contains an invalid Unicode character. The
:c:func:`Py_DecodeLocale` function now escapes byte sequences which would be
decoded as Unicode characters outside the [U+0000; U+10ffff] range.
..
.. bpo: 43410
.. date: 2021-03-05-17-23-36
.. nonce: lCzIg0
.. section: Core and Builtins
Fix a bug that was causing the parser to crash when emitting syntax errors
when reading input from stdin. Patch by Pablo Galindo
..
.. bpo: 43406
.. date: 2021-03-04-22-53-10
.. nonce: Na_VpA
.. section: Core and Builtins
Fix a possible race condition where ``PyErr_CheckSignals`` tries to execute
a non-Python signal handler.
..
.. bpo: 42128
.. date: 2021-03-03-19-04-23
.. nonce: VouZjn
.. section: Core and Builtins
Add ``__match_args__`` to :ref:`struct sequence objects <struct-sequence-objects>`.
Patch by Pablo Galindo.
..
.. bpo: 43390
.. date: 2021-03-03-17-58-49
.. nonce: epPpwV
.. section: Core and Builtins
CPython now sets the ``SA_ONSTACK`` flag in ``PyOS_setsig`` for the VM's
default signal handlers.  This is friendlier to other in-process code that
an extension module or embedding use could pull in (such as Golang's cgo)
where tiny thread stacks are the norm and ``sigaltstack()`` has been used to
provide for signal handlers.  This is a no-op change for the vast majority
of processes that don't use sigaltstack.
..
.. bpo: 43287
.. date: 2021-02-22-03-01-02
.. nonce: aTs6fO
.. section: Core and Builtins
Speed up calls to ``filter()`` by using the :pep:`590` ``vectorcall``
calling convention. Patch by Donghee Na.
..
.. bpo: 37448
.. date: 2021-02-21-14-19-35
.. nonce: btl7vO
.. section: Core and Builtins
Add a radix tree based memory map to track in-use obmalloc arenas. Use to
replace the old implementation of address_in_range(). The radix tree
approach makes it easy to increase pool sizes beyond the OS page size.
Boosting the pool and arena size allows obmalloc to handle a significantly
higher percentage of requests from its ultra-fast paths.
It also has the advantage of eliminating the memory unsanitary behavior of
the previous address_in_range(). The old address_in_range() was marked with
the annotations _Py_NO_SANITIZE_ADDRESS, _Py_NO_SANITIZE_THREAD, and
_Py_NO_SANITIZE_MEMORY. Those annotations are no longer needed.
To disable the radix tree map, set a preprocessor flag as follows:
``-DWITH_PYMALLOC_RADIX_TREE=0``.
Co-authored-by: Tim Peters <tim.peters@gmail.com>
..
.. bpo: 29988
.. date: 2020-02-03-13-23-10
.. nonce: 8_UB5w
.. section: Core and Builtins
Only handle asynchronous exceptions and requests to drop the GIL when
returning from a call or on the back edges of loops. Makes sure that
:meth:`~object.__exit__` is always called in with statements, even for interrupts.
..
.. bpo: 43720
.. date: 2021-04-03-13-45-51
.. nonce: FDZ5cZ
.. section: Library
Document various stdlib deprecations in imp, pkgutil, and importlib.util for
removal in Python 3.12.
..
.. bpo: 43433
.. date: 2021-03-28-23-50-20
.. nonce: so9j5G
.. section: Library
:class:`xmlrpc.client.ServerProxy` no longer ignores query and fragment in
the URL of the server.
..
.. bpo: 31956
.. date: 2021-03-28-16-53-25
.. nonce: Lt_67U
.. section: Library
The :meth:`~array.array.index` method of :class:`array.array` now has
optional *start* and *stop* parameters.
..
.. bpo: 40066
.. date: 2021-03-25-21-26-30
.. nonce: 7EBQ3_
.. section: Library
Enum: adjust ``repr()`` to show only enum and member name (not value, nor
angle brackets) and ``str()`` to show only member name.  Update and improve
documentation to match.
..
.. bpo: 42136
.. date: 2021-03-25-08-44-26
.. nonce: rRY9e1
.. section: Library
Deprecate all module_repr() methods found in importlib as their use is being
phased out by Python 3.12.
..
.. bpo: 35930
.. date: 2021-03-23-17-18-56
.. nonce: RZ51pM
.. section: Library
Raising an exception raised in a "future" instance will create reference
cycles.
..
.. bpo: 41369
.. date: 2021-03-21-17-50-42
.. nonce: -fpmYZ
.. section: Library
Finish updating the vendored libmpdec to version 2.5.1.  Patch by Stefan
Krah.
..
.. bpo: 43422
.. date: 2021-03-21-17-02-52
.. nonce: POk6cU
.. section: Library
Revert the _decimal C API which was added in bpo-41324.
..
.. bpo: 43577
.. date: 2021-03-21-10-13-17
.. nonce: m7JnAV
.. section: Library
Fix deadlock when using :class:`ssl.SSLContext` debug callback with
:meth:`ssl.SSLContext.sni_callback`.
..
.. bpo: 43571
.. date: 2021-03-20-17-40-35
.. nonce: acAL0W
.. section: Library
It's now possible to create MPTCP sockets with IPPROTO_MPTCP
..
.. bpo: 43542
.. date: 2021-03-20-15-43-25
.. nonce: 6bt2F6
.. section: Library
``image/heic`` and ``image/heif`` were added to :mod:`mimetypes`.
..
.. bpo: 40645
.. date: 2021-03-19-10-22-17
.. nonce: 5pXhb-
.. section: Library
The :mod:`hmac` module now uses OpenSSL's HMAC implementation when digestmod
argument is a hash name or builtin hash function.
..
.. bpo: 43510
.. date: 2021-03-16-17-20-33
.. nonce: -BeQH_
.. section: Library
Implement :pep:`597`: Add ``EncodingWarning`` warning, ``-X
warn_default_encoding`` option, :envvar:`PYTHONWARNDEFAULTENCODING`
environment variable and ``encoding="locale"`` argument value.
..
.. bpo: 43521
.. date: 2021-03-16-16-05-02
.. nonce: mRT6fh
.. section: Library
``ast.unparse`` can now render NaNs and empty sets.
..
.. bpo: 42914
.. date: 2021-03-14-21-47-28
.. nonce: 9U1o33
.. section: Library
:func:`pprint.pprint` gains a new boolean ``underscore_numbers`` optional
argument to emit integers with thousands separated by an underscore
character for improved readability (for example ``1_000_000`` instead of
``1000000``).
..
.. bpo: 41361
.. date: 2021-03-13-08-18-01
.. nonce: lXDIlr
.. section: Library
:meth:`~collections.deque.rotate` calls are now slightly faster due to
faster argument parsing.
..
.. bpo: 43423
.. date: 2021-03-11-15-44-18
.. nonce: rRomRD
.. section: Library
:func:`subprocess.communicate` no longer raises an IndexError when there is
an empty stdout or stderr IO buffer during a timeout on Windows.
..
.. bpo: 27820
.. date: 2021-03-10-14-07-44
.. nonce: Wwdy-r
.. section: Library
Fixed long-standing bug of smtplib.SMTP where doing AUTH LOGIN with
initial_response_ok=False will fail.
The cause is that SMTP.auth_login _always_ returns a password if provided
with a challenge string, thus non-compliant with the standard for AUTH
LOGIN.
Also fixes bug with the test for smtpd.
..
.. bpo: 43445
.. date: 2021-03-09-11-36-19
.. nonce: jnj-UB
.. section: Library
Add frozen modules to :data:`sys.stdlib_module_names`. For example, add
``"_frozen_importlib"`` and ``"_frozen_importlib_external"`` names.
..
.. bpo: 43245
.. date: 2021-03-08-22-14-37
.. nonce: nXL-MC
.. section: Library
Add keyword arguments support to ``ChainMap.new_child()``.
..
.. bpo: 29982
.. date: 2021-03-07-23-23-03
.. nonce: Q9iszT
.. section: Library
Add optional parameter *ignore_cleanup_errors* to
:func:`tempfile.TemporaryDirectory` and allow multiple :func:`cleanup`
attempts. Contributed by C.A.M. Gerlach.
..
.. bpo: 43428
.. date: 2021-03-07-18-54-39
.. nonce: br0XmX
.. section: Library
Include changes from `importlib_metadata 3.7
<https://importlib-metadata.readthedocs.io/en/latest/history.html#v3-7-0>`_:
Performance enhancements to distribution discovery.
``entry_points`` only returns unique distributions.
Introduces new ``EntryPoints`` object for containing a set of entry points
with convenience methods for selecting entry points by group or name.
``entry_points`` now returns this object if selection parameters are
supplied but continues to return a dict object for compatibility. Users are
encouraged to rely on the selection interface. The dict object result is
likely to be deprecated in the future.
Added packages_distributions function to return a mapping of packages to the
distributions that provide them.
..
.. bpo: 43332
.. date: 2021-03-07-11-23-20
.. nonce: weatsh
.. section: Library
Improves the networking efficiency of :mod:`http.client` when using a proxy
via :meth:`~HTTPConnection.set_tunnel`.  Fewer small send calls are made
during connection setup.
..
.. bpo: 43420
.. date: 2021-03-07-08-03-31
.. nonce: cee_X5
.. section: Library
Improve performance of :class:`fractions.Fraction` arithmetics for large
components.  Contributed by Sergey B. Kirpichev.
..
.. bpo: 43356
.. date: 2021-03-04-21-51-20
.. nonce: X7IGBM
.. section: Library
Allow passing a signal number to ``_thread.interrupt_main()``.
..
.. bpo: 43399
.. date: 2021-03-04-17-53-46
.. nonce: Wn95u-
.. section: Library
Fix ``ElementTree.extend`` not working on iterators when using the Python
implementation
..
.. bpo: 43369
.. date: 2021-03-02-15-25-28
.. nonce: F4knlQ
.. section: Library
Improve :mod:`sqlite3` error handling: If ``sqlite3_column_text()`` and
``sqlite3_column_blob()`` set ``SQLITE_NOMEM``, :exc:`MemoryError` is now
raised. Patch by Erlend E. Aasland.
..
.. bpo: 43368
.. date: 2021-03-02-13-45-05
.. nonce: t9XEkQ
.. section: Library
Fix a regression introduced in PR 24562, where an empty bytestring was
fetched as ``None`` instead of ``b''`` in :mod:`sqlite3`. Patch by Mariusz
Felisiak.
..
.. bpo: 41282
.. date: 2021-03-02-09-54-22
.. nonce: xL4h94
.. section: Library
Fixed stacklevel of ``DeprecationWarning`` emitted from ``import
distutils``.
..
.. bpo: 42129
.. date: 2021-02-28-04-21-35
.. nonce: V0KifQ
.. section: Library
``importlib.resources`` now honors namespace packages, merging resources
from each location in the namespace as introduced in ``importlib_resources``
3.2 and including incidental changes through 5.0.3.
..
.. bpo: 43295
.. date: 2021-02-22-22-54-40
.. nonce: h_ffu7
.. section: Library
:meth:`datetime.datetime.strptime` now raises ``ValueError`` instead of
``IndexError`` when matching ``'z'`` with the ``%z`` format specifier.
..
.. bpo: 43125
.. date: 2021-02-07-19-13-30
.. nonce: AqNoMa
.. section: Library
Return empty string if base64mime.body_encode receive empty bytes
..
.. bpo: 43084
.. date: 2021-01-31-17-31-13
.. nonce: i8nLpK
.. section: Library
:func:`curses.window.enclose` returns now ``True`` or ``False`` (as was
documented) instead of ``1`` or ``0``.
..
.. bpo: 42994
.. date: 2021-01-21-16-58-34
.. nonce: El0Ksp
.. section: Library
Add MIME types for opus, AAC, 3gpp and 3gpp2
..
.. bpo: 14678
.. date: 2021-01-07-21-25-49
.. nonce: 1zniCH
.. section: Library
Add an invalidate_caches() method to the zipimport.zipimporter class to
support importlib.invalidate_caches(). Patch by Desmond Cheong.
..
.. bpo: 42782
.. date: 2020-12-29-13-46-57
.. nonce: 3r0HFY
.. section: Library
Fail fast in :func:`shutil.move` to avoid creating destination directories
on failure.
..
.. bpo: 40066
.. date: 2020-09-23-21-58-34
.. nonce: f1dr_5
.. section: Library
Enum's ``repr()`` and ``str()`` have changed: ``repr()`` is now
*EnumClass.MemberName* and ``str()`` is *MemberName*.  Additionally, stdlib
Enum's whose contents are available as module attributes, such as
``RegexFlag.IGNORECASE``, have their ``repr()`` as *module.name*, e.g.
``re.IGNORECASE``.
..
.. bpo: 26053
.. date: 2020-09-01-10-12-13
.. nonce: hXikw_
.. section: Library
Fixed bug where the :mod:`pdb` interactive run command echoed the args from
the shell command line, even if those have been overridden at the pdb
prompt.
..
.. bpo: 24160
.. date: 2020-08-28-23-07-53
.. nonce: MSGnKr
.. section: Library
Fixed bug where breakpoints did not persist across multiple debugger
sessions in :mod:`pdb`'s interactive mode.
..
.. bpo: 40701
.. date: 2020-05-27-05-42-39
.. nonce: PBIgW1
.. section: Library
When the :data:`tempfile.tempdir` global variable is set to a value of type
bytes, it is now handled consistently.  Previously exceptions could be
raised from some tempfile APIs when the directory did not already exist in
this situation.  Also ensures that the :func:`tempfile.gettempdir` and
:func:`tempfile.gettempdirb` functions *always* return ``str`` and
``bytes`` respectively.
..
.. bpo: 39342
.. date: 2020-01-15-11-15-35
.. nonce: S8PuJO
.. section: Library
Expose ``X509_V_FLAG_ALLOW_PROXY_CERTS`` as
:const:`~ssl.VERIFY_ALLOW_PROXY_CERTS` to allow proxy certificate validation
as explained in
https://docs.openssl.org/1.1.1/man7/proxy-certificates/.
..
.. bpo: 31861
.. date: 2018-08-24-01-08-09
.. nonce: -q9RKJ
.. section: Library
Add builtins.aiter and builtins.anext. Patch by Joshua Bronson (@jab),
Daniel Pope (@lordmauve), and Justin Wang (@justin39).
..
.. bpo: 43199
.. date: 2021-03-13-18-43-54
.. nonce: ZWA6KX
.. section: Documentation
Answer "Why is there no goto?" in the Design and History FAQ.
..
.. bpo: 43407
.. date: 2021-03-04-22-53-03
.. nonce: x570l5
.. section: Documentation
Clarified that a result from :func:`time.monotonic`,
:func:`time.perf_counter`, :func:`time.process_time`, or
:func:`time.thread_time` can be compared with the result from any following
call to the same function - not just the next immediate call.
..
.. bpo: 43354
.. date: 2021-03-02-12-55-34
.. nonce: ezZYkx
.. section: Documentation
Fix type documentation for ``Fault.faultCode``; the type has to be ``int``
instead of ``str``.
..
.. bpo: 41933
.. date: 2020-10-05-20-04-43
.. nonce: Pff94-
.. section: Documentation
Clarified wording of s * n in the Common Sequence Operations
..
.. bpo: 37945
.. date: 2021-03-31-11-38-42
.. nonce: HTUYhv
.. section: Tests
Fix test_getsetlocale_issue1813() of test_locale: skip the test if
``setlocale()`` fails. Patch by Victor Stinner.
..
.. bpo: 41561
.. date: 2021-03-18-10-34-42
.. nonce: pDg4w-
.. section: Tests
Add workaround for Ubuntu's custom OpenSSL security level policy.
..
.. bpo: 43179
.. date: 2021-03-31-12-20-23
.. nonce: Qbe1OD
.. section: Build
Introduce and correctly use ALIGNOF_X in place of SIZEOF_X for
alignment-related code in optimized string routines. Patch by Jessica
Clarke.
..
.. bpo: 43631
.. date: 2021-03-26-09-16-34
.. nonce: msJyPi
.. section: Build
Update macOS, Windows, and CI to OpenSSL 1.1.1k.
..
.. bpo: 43617
.. date: 2021-03-24-16-55-55
.. nonce: d69KAv
.. section: Build
Improve configure.ac: Check for presence of autoconf-archive package and
remove our copies of M4 macros.
..
.. bpo: 43466
.. date: 2021-03-11-00-14-47
.. nonce: N861Z5
.. section: Build
The ``configure`` script now supports ``--with-openssl-rpath`` option.
..
.. bpo: 43372
.. date: 2021-03-04-17-13-57
.. nonce: FfqDVL
.. section: Build
Use ``_freeze_importlib`` to generate code for the ``__hello__`` module.
This approach ensures the code matches the interpreter version.  Previously,
PYTHON_FOR_REGEN was used to generate the code, which might be wrong.  The
marshal format for code objects has changed with bpo-42246, commit 877df851.
Update the code and the expected code sizes in ctypes test_frozentable.
..
.. bpo: 43440
.. date: 2021-03-09-11-15-41
.. nonce: igy2Mn
.. section: Windows
Build :mod:`sqlite3` with the ``R*Tree`` module enabled. Patch by Erlend E.
Aasland.
..
.. bpo: 42225
.. date: 2021-03-29-16-22-27
.. nonce: iIeiLg
.. section: IDLE
Document that IDLE can fail on Unix either from misconfigured IP masquerade
rules or failure displaying complex colored (non-ascii) characters.
..
.. bpo: 43688
.. date: 2021-04-01-09-10-42
.. nonce: G4gs6k
.. section: C API
The limited C API is now supported if Python is built in debug mode (if the
``Py_DEBUG`` macro is defined). In the limited C API, the
:c:func:`Py_INCREF` and :c:func:`Py_DECREF` functions are now implemented as
opaque function calls, rather than accessing directly the
:c:member:`PyObject.ob_refcnt` member, if Python is built in debug mode and
the ``Py_LIMITED_API`` macro targets Python 3.10 or newer. It became
possible to support the limited C API in debug mode because the
:c:type:`PyObject` structure is the same in release and debug mode since
Python 3.8 (see :issue:`36465`).
The limited C API is still not supported in the ``--with-trace-refs``
special build (``Py_TRACE_REFS`` macro).
Patch by Victor Stinner.
..
.. bpo: 43244
.. date: 2021-03-24-01-22-14
.. nonce: 31-97x
.. section: C API
Remove the ``pyarena.h`` header file with functions:
* ``PyArena_New()``
* ``PyArena_Free()``
* ``PyArena_Malloc()``
* ``PyArena_AddPyObject()``
These functions were undocumented, excluded from the limited C API, and were
only used internally by the compiler. Patch by Victor Stinner.
..
.. bpo: 43244
.. date: 2021-03-23-20-53-41
.. nonce: VK3sLH
.. section: C API
Remove the compiler and parser functions using ``struct _mod`` type, because
the public AST C API was removed:
* ``PyAST_Compile()``
* ``PyAST_CompileEx()``
* ``PyAST_CompileObject()``
* ``PyFuture_FromAST()``
* ``PyFuture_FromASTObject()``
* ``PyParser_ASTFromFile()``
* ``PyParser_ASTFromFileObject()``
* ``PyParser_ASTFromFilename()``
* ``PyParser_ASTFromString()``
* ``PyParser_ASTFromStringObject()``
These functions were undocumented and excluded from the limited C API. Patch
by Victor Stinner.
..
.. bpo: 43244
.. date: 2021-03-19-12-56-11
.. nonce: VuIyOD
.. section: C API
Remove ``ast.h``, ``asdl.h``, and ``Python-ast.h`` header files. These
functions were undocumented and excluded from the limited C API. Most names
defined by these header files were not prefixed by ``Py`` and so could
create names conflicts. For example, ``Python-ast.h`` defined a ``Yield``
macro which was conflict with the ``Yield`` name used by the Windows
``<winbase.h>`` header. Use the Python :mod:`ast` module instead. Patch by
Victor Stinner.
..
.. bpo: 43541
.. date: 2021-03-18-12-44-33
.. nonce: ICigzd
.. section: C API
Fix a ``PyEval_EvalCodeEx()`` regression: fix reference counting on
builtins. Patch by Victor Stinner.
..
.. bpo: 43244
.. date: 2021-03-17-23-53-14
.. nonce: kfPqA_
.. section: C API
Remove the ``symtable.h`` header file and the undocumented functions:
* ``PyST_GetScope()``
* ``PySymtable_Build()``
* ``PySymtable_BuildObject()``
* ``PySymtable_Free()``
* ``Py_SymtableString()``
* ``Py_SymtableStringObject()``
The ``Py_SymtableString()`` function was part the stable ABI by mistake but
it could not be used, because the ``symtable.h`` header file was excluded
from the limited C API.
The Python :mod:`symtable` module remains available and is unchanged.
Patch by Victor Stinner.
..
.. bpo: 43244
.. date: 2021-03-17-23-20-07
.. nonce: diyn2C
.. section: C API
Remove the ``PyAST_Validate()`` function. It is no longer possible to build
a AST object (``mod_ty`` type) with the public C API. The function was
already excluded from the limited C API (:pep:`384`). Patch by Victor
Stinner.

.. bpo: 40121
.. date: 2020-03-30-23-16-25
.. nonce: p2LIio
.. release date: 2020-04-27
.. section: Security
Fixes audit events raised on creating a new socket.
..
.. bpo: 39073
.. date: 2020-03-15-01-28-36
.. nonce: 6Szd3i
.. section: Security
Disallow CR or LF in email.headerregistry.Address arguments to guard against
header injection attacks.
..
.. bpo: 39503
.. date: 2020-01-30-16-15-29
.. nonce: B299Yq
.. section: Security
:cve:`2020-8492`: The :class:`~urllib.request.AbstractBasicAuthHandler` class
of the :mod:`urllib.request` module uses an inefficient regular expression
which can be exploited by an attacker to cause a denial of service. Fix the
regex to prevent the catastrophic backtracking. Vulnerability reported by
Ben Caller and Matt Schwager.
..
.. bpo: 40313
.. date: 2020-04-20-23-58-35
.. nonce: USVRW8
.. section: Core and Builtins
Improve the performance of bytes.hex().
..
.. bpo: 40334
.. date: 2020-04-20-14-06-19
.. nonce: CTLGEp
.. section: Core and Builtins
Switch to a new parser, based on PEG.  For more details see PEP 617. To
temporarily switch back to the old parser, use ``-X oldparser`` or
``PYTHONOLDPARSER=1``.  In Python 3.10 we will remove the old parser
completely, including the ``parser`` module (already deprecated) and
anything that depends on it.
..
.. bpo: 40267
.. date: 2020-04-14-18-54-50
.. nonce: Q2N6Bw
.. section: Core and Builtins
Fix the tokenizer to display the correct error message, when there is a
``SyntaxError`` on the last input character and no newline follows. It used to
be ``unexpected EOF while parsing``, while it should be ``invalid syntax``.
..
.. bpo: 39522
.. date: 2020-04-14-18-47-00
.. nonce: uVeIV_
.. section: Core and Builtins
Correctly unparse explicit ``u`` prefix for strings when postponed
evaluation for annotations activated. Patch by Batuhan Taskaya.
..
.. bpo: 40246
.. date: 2020-04-11-17-52-03
.. nonce: vXPze5
.. section: Core and Builtins
Report a specialized error message, ``invalid string prefix``, when the
tokenizer encounters a string with an invalid prefix.
..
.. bpo: 40082
.. date: 2020-04-08-22-33-24
.. nonce: WI3-lu
.. section: Core and Builtins
Fix the signal handler: it now always uses the main interpreter, rather than
trying to get the current Python thread state.
..
.. bpo: 37388
.. date: 2020-04-07-15-44-29
.. nonce: stlxBq
.. section: Core and Builtins
str.encode() and str.decode() no longer check the encoding and errors in
development mode or in debug mode during Python finalization. The codecs
machinery can no longer work on very late calls to str.encode() and
str.decode().
..
.. bpo: 40077
.. date: 2020-04-04-12-43-19
.. nonce: m15TTX
.. section: Core and Builtins
Fix possible refleaks in :mod:`!_json`, memo of PyScannerObject should be
traversed.
..
.. bpo: 37207
.. date: 2020-04-02-00-25-19
.. nonce: ZTPmKJ
.. section: Core and Builtins
Speed up calls to ``dict()`` by using the :pep:`590` ``vectorcall`` calling
convention.
..
.. bpo: 40141
.. date: 2020-04-01-21-50-37
.. nonce: 8fCRVj
.. section: Core and Builtins
Add column and line information to ``ast.keyword`` nodes. Patch by Pablo
Galindo.
..
.. bpo: 1635741
.. date: 2020-04-01-00-08-18
.. nonce: bhGWam
.. section: Core and Builtins
Port :mod:`resource` to multiphase initialization (:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-03-31-22-15-04
.. nonce: 8Ir1a0
.. section: Core and Builtins
Port :mod:`math` to multiphase initialization (:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-03-31-21-12-27
.. nonce: S2nkF3
.. section: Core and Builtins
Port _uuid module to multiphase initialization (:pep:`489`).
..
.. bpo: 40077
.. date: 2020-03-27-01-11-08
.. nonce: wT002V
.. section: Core and Builtins
Convert json module to use :c:func:`PyType_FromSpec`.
..
.. bpo: 40067
.. date: 2020-03-25-20-34-01
.. nonce: 0bFda2
.. section: Core and Builtins
Improve the error message for multiple star expressions in an assignment.
Patch by Furkan Onder
..
.. bpo: 1635741
.. date: 2020-03-24-22-26-26
.. nonce: AB38ot
.. section: Core and Builtins
Port _functools module to multiphase initialization (PEP 489). Patch by
Paulo Henrique Silva.
..
.. bpo: 1635741
.. date: 2020-03-24-22-17-12
.. nonce: jWaMRV
.. section: Core and Builtins
Port operator module to multiphase initialization (PEP 489). Patch by Paulo
Henrique Silva.
..
.. bpo: 20526
.. date: 2020-03-23-18-08-34
.. nonce: NHNZIv
.. section: Core and Builtins
Fix :c:func:`PyThreadState_Clear()`. ``PyThreadState.frame`` is a borrowed
reference, not a strong reference: ``PyThreadState_Clear()`` must not call
``Py_CLEAR(tstate->frame)``.
..
.. bpo: 1635741
.. date: 2020-03-22-01-01-41
.. nonce: gR7Igp
.. section: Core and Builtins
Port time module to multiphase initialization (:pep:`489`). Patch by Paulo
Henrique Silva.
..
.. bpo: 1635741
.. date: 2020-03-20-13-42-35
.. nonce: bhIu5M
.. section: Core and Builtins
Port _weakref extension module to multiphase initialization (:pep:`489`).
..
.. bpo: 40020
.. date: 2020-03-19-21-53-41
.. nonce: n-26G7
.. section: Core and Builtins
Fix a leak and subsequent crash in parsetok.c caused by realloc misuse on a
rare codepath.
..
.. bpo: 39939
.. date: 2020-03-11-19-17-36
.. nonce: NwCnAM
.. section: Core and Builtins
Added str.removeprefix and str.removesuffix methods and corresponding bytes,
bytearray, and collections.UserString methods to remove affixes from a
string if present. See :pep:`616` for a full description. Patch by Dennis
Sweeney.
..
.. bpo: 39481
.. date: 2020-01-28-17-19-18
.. nonce: rqSeGl
.. section: Core and Builtins
Implement PEP 585. This supports list[int], tuple[str, ...] etc.
..
.. bpo: 32894
.. date: 2019-12-01-21-36-49
.. nonce: 5g_UQr
.. section: Core and Builtins
Support unparsing of infinity numbers in postponed annotations. Patch by
Batuhan Taşkaya.
..
.. bpo: 37207
.. date: 2019-06-09-10-54-31
.. nonce: bLjgLS
.. section: Core and Builtins
Speed up calls to ``list()`` by using the :pep:`590` ``vectorcall`` calling
convention. Patch by Mark Shannon.
..
.. bpo: 40398
.. date: 2020-04-26-22-25-36
.. nonce: OdXnR3
.. section: Library
:func:`typing.get_args` now always returns an empty tuple for special
generic aliases.
..
.. bpo: 40396
.. date: 2020-04-26-19-07-40
.. nonce: Fn-is1
.. section: Library
Functions :func:`typing.get_origin`, :func:`typing.get_args` and
:func:`typing.get_type_hints` support now generic aliases like
``list[int]``.
..
.. bpo: 38061
.. date: 2020-04-24-01-55-00
.. nonce: XmULB3
.. section: Library
Optimize the :mod:`subprocess` module on FreeBSD using ``closefrom()``. A
single ``close(fd)`` syscall is cheap, but when ``sysconf(_SC_OPEN_MAX)`` is
high, the loop calling ``close(fd)`` on each file descriptor can take
several milliseconds.
The workaround on FreeBSD to improve performance was to load and mount the
fdescfs kernel module, but this is not enabled by default.
Initial patch by Ed Maste (emaste), Conrad Meyer (cem), Kyle Evans (kevans)
and Kubilay Kocak (koobs):
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242274
..
.. bpo: 38061
.. date: 2020-04-24-01-27-08
.. nonce: cdlkMz
.. section: Library
On FreeBSD, ``os.closerange(fd_low, fd_high)`` now calls
``closefrom(fd_low)`` if *fd_high* is greater than or equal to
``sysconf(_SC_OPEN_MAX)``.
Initial patch by Ed Maste (emaste), Conrad Meyer (cem), Kyle Evans (kevans)
and Kubilay Kocak (koobs):
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242274
..
.. bpo: 40360
.. date: 2020-04-22-20-55-17
.. nonce: Er8sv-
.. section: Library
The :mod:`!lib2to3` module is pending deprecation due to :pep:`617`.
..
.. bpo: 40138
.. date: 2020-04-22-00-05-10
.. nonce: i_oGqa
.. section: Library
Fix the Windows implementation of :func:`os.waitpid` for exit code larger
than ``INT_MAX >> 8``. The exit status is now interpreted as an unsigned
number.
..
.. bpo: 39942
.. date: 2020-04-20-20-16-02
.. nonce: NvGnTc
.. section: Library
Set "__main__" as the default module name when "__name__" is missing in
:class:`typing.TypeVar`. Patch by Weipeng Hong.
..
.. bpo: 40275
.. date: 2020-04-20-19-06-55
.. nonce: 9UcN2g
.. section: Library
The :mod:`logging` package is now imported lazily in :mod:`unittest` only
when the :meth:`~unittest.TestCase.assertLogs` assertion is used.
..
.. bpo: 40275
.. date: 2020-04-20-18-50-25
.. nonce: Ofk6J8
.. section: Library
The :mod:`asyncio` package is now imported lazily in :mod:`unittest` only
when the :class:`~unittest.IsolatedAsyncioTestCase` class is used.
..
.. bpo: 40330
.. date: 2020-04-19-17-31-29
.. nonce: DGjoIS
.. section: Library
In :meth:`ShareableList.__setitem__`, check the size of a new string item
after encoding it to utf-8, not before.
..
.. bpo: 40148
.. date: 2020-04-19-14-16-43
.. nonce: pDZR6V
.. section: Library
Added :meth:`pathlib.Path.with_stem` to create a new Path with the stem
replaced.
..
.. bpo: 40325
.. date: 2020-04-18-19-40-00
.. nonce: KWSvix
.. section: Library
Deprecated support for set objects in random.sample().
..
.. bpo: 40257
.. date: 2020-04-18-10-52-15
.. nonce: lv4WTq
.. section: Library
Improved help for the :mod:`typing` module. Docstrings are now shown for all
special forms and special generic aliases (like ``Union`` and ``List``).
Using ``help()`` with generic alias like ``List[int]`` will show the help
for the correspondent concrete type (``list`` in this case).
..
.. bpo: 40257
.. date: 2020-04-15-19-34-11
.. nonce: ux8FUr
.. section: Library
:func:`inspect.getdoc` no longer returns docstring inherited from the type of
the object or from parent class if it is a class if it is not defined in the
object itself. In :mod:`pydoc` the documentation string is now shown not
only for class, function, method etc, but for any object that has its own
``__doc__`` attribute.
..
.. bpo: 40287
.. date: 2020-04-15-17-21-48
.. nonce: -mkEJH
.. section: Library
Fixed ``SpooledTemporaryFile.seek()`` to return the position.
..
.. bpo: 40290
.. date: 2020-04-15-16-43-48
.. nonce: eqCMGJ
.. section: Library
Added zscore() to statistics.NormalDist().
..
.. bpo: 40282
.. date: 2020-04-15-10-23-52
.. nonce: rIYJmu
.. section: Library
Allow ``random.getrandbits(0)`` to succeed and to return 0.
..
.. bpo: 40286
.. date: 2020-04-15-00-39-25
.. nonce: ai80FA
.. section: Library
Add :func:`random.randbytes` function and :meth:`random.Random.randbytes`
method to generate random bytes.
..
.. bpo: 40277
.. date: 2020-04-14-21-53-18
.. nonce: NknSaf
.. section: Library
:func:`collections.namedtuple` now provides a human-readable repr for its
field accessors.
..
.. bpo: 40270
.. date: 2020-04-14-16-18-49
.. nonce: XVJzeG
.. section: Library
The included copy of sqlite3 on Windows is now compiled with the json
extension. This allows the use of functions such as ``json_object``.
..
.. bpo: 29255
.. date: 2020-04-14-11-31-07
.. nonce: 4EcyIN
.. section: Library
Wait in ``KqueueSelector.select`` when no fds are registered
..
.. bpo: 40260
.. date: 2020-04-12-21-18-56
.. nonce: F6VWaE
.. section: Library
Ensure :mod:`modulefinder` uses :func:`io.open_code` and respects coding
comments.
..
.. bpo: 40234
.. date: 2020-04-10-16-13-47
.. nonce: tar4d_
.. section: Library
Allow again to spawn daemon threads in subinterpreters (revert change which
denied them).
..
.. bpo: 39207
.. date: 2020-04-10-01-24-58
.. nonce: 2dE5Ox
.. section: Library
Workers in :class:`~concurrent.futures.ProcessPoolExecutor` are now spawned
on demand, only when there are no available idle workers to reuse. This
optimizes startup overhead and reduces the amount of lost CPU time to idle
workers. Patch by Kyle Stanley.
..
.. bpo: 40091
.. date: 2020-04-07-23-26-25
.. nonce: 5M9AW5
.. section: Library
Fix a hang at fork in the logging module: the new private _at_fork_reinit()
method is now used to reinitialize locks at fork in the child process.
..
.. bpo: 40149
.. date: 2020-04-07-18-06-38
.. nonce: mMU2iu
.. section: Library
Implement traverse and clear slots in _abc._abc_data type.
..
.. bpo: 40208
.. date: 2020-04-06-20-09-33
.. nonce: 3rO_q7
.. section: Library
Remove deprecated :meth:`!symtable.SymbolTable.has_exec`.
..
.. bpo: 40196
.. date: 2020-04-06-11-05-13
.. nonce: Jqowse
.. section: Library
Fix a bug in the :mod:`symtable` module that was causing incorrectly report
global variables as local. Patch by Pablo Galindo.
..
.. bpo: 40190
.. date: 2020-04-05-02-58-17
.. nonce: HF3OWo
.. section: Library
Add support for ``_SC_AIX_REALMEM`` to :func:`posix.sysconf`.
..
.. bpo: 40182
.. date: 2020-04-04-23-44-09
.. nonce: Bf_kFN
.. section: Library
Removed the ``_field_types`` attribute of the :class:`typing.NamedTuple`
class.
..
.. bpo: 36517
.. date: 2020-04-04-17-49-39
.. nonce: Ilj1IJ
.. section: Library
Multiple inheritance with :class:`typing.NamedTuple` now raises an error
instead of silently ignoring other types.
..
.. bpo: 40126
.. date: 2020-04-04-00-47-40
.. nonce: Y-bTNP
.. section: Library
Fixed reverting multiple patches in unittest.mock. Patcher's ``__exit__()``
is now never called if its ``__enter__()`` is failed. Returning true from
``__exit__()`` silences now the exception.
..
.. bpo: 40094
.. date: 2020-04-02-01-13-28
.. nonce: AeZ34K
.. section: Library
CGIHTTPRequestHandler of http.server now logs the CGI script exit code,
rather than the CGI script exit status of os.waitpid(). For example, if the
script is killed by signal 11, it now logs: "CGI script exit code -11."
..
.. bpo: 40108
.. date: 2020-03-31-01-11-20
.. nonce: EGDVQ_
.. section: Library
Improve the error message when triying to import a module using :mod:`runpy`
and incorrectly using the ".py" extension at the end of the module name. Patch
by Pablo Galindo.
..
.. bpo: 40094
.. date: 2020-03-28-18-25-49
.. nonce: v-wQIU
.. section: Library
Add :func:`os.waitstatus_to_exitcode` function: convert a wait status to an
exit code.
..
.. bpo: 40089
.. date: 2020-03-27-17-22-34
.. nonce: -lFsD0
.. section: Library
Fix threading._after_fork(): if fork was not called by a thread spawned by
threading.Thread, threading._after_fork() now creates a _MainThread instance
for _main_thread, instead of a _DummyThread instance.
..
.. bpo: 40089
.. date: 2020-03-27-16-54-29
.. nonce: VTq_8s
.. section: Library
Add a private ``_at_fork_reinit()`` method to :class:`!_thread.Lock`,
:class:`!_thread.RLock`, :class:`threading.RLock` and
:class:`threading.Condition` classes: reinitialize the lock at fork in the
child process, reset the lock to the unlocked state. Rename also the private
``_reset_internal_locks()`` method of :class:`threading.Event` to
``_at_fork_reinit()``.
..
.. bpo: 25780
.. date: 2020-03-27-08-57-46
.. nonce: kIjVge
.. section: Library
Expose :const:`~socket.CAN_RAW_JOIN_FILTERS` in the :mod:`socket` module.
..
.. bpo: 39503
.. date: 2020-03-25-16-02-16
.. nonce: YmMbYn
.. section: Library
:class:`~urllib.request.AbstractBasicAuthHandler` of :mod:`urllib.request`
now parses all WWW-Authenticate HTTP headers and accepts multiple challenges
per header: use the realm of the first Basic challenge.
..
.. bpo: 39812
.. date: 2020-03-25-00-35-48
.. nonce: rIKnms
.. section: Library
Removed daemon threads from :mod:`concurrent.futures` by adding an internal
``threading._register_atexit()``, which calls registered functions prior to
joining all non-daemon threads. This allows for compatibility with
subinterpreters, which don't support daemon threads.
..
.. bpo: 40050
.. date: 2020-03-24-16-17-20
.. nonce: 6GrOlz
.. section: Library
Fix ``importlib._bootstrap_external``: avoid creating a new ``winreg``
builtin module if it's already available in :data:`sys.modules`, and remove
redundant imports.
..
.. bpo: 40014
.. date: 2020-03-23-17-52-00
.. nonce: Ya70VG
.. section: Library
Fix ``os.getgrouplist()``: if ``getgrouplist()`` function fails because the
group list is too small, retry with a larger group list. On failure, the
glibc implementation of ``getgrouplist()`` sets ``ngroups`` to the total
number of groups. For other implementations, double the group list size.
..
.. bpo: 40017
.. date: 2020-03-21-00-46-18
.. nonce: HFpHZS
.. section: Library
Add :const:`time.CLOCK_TAI` constant if the operating system support it.
..
.. bpo: 40016
.. date: 2020-03-19-19-40-27
.. nonce: JWtxqJ
.. section: Library
In re docstring, clarify the relationship between inline and argument
compile flags.
..
.. bpo: 39953
.. date: 2020-03-19-16-33-03
.. nonce: yy5lC_
.. section: Library
Update internal table of OpenSSL error codes in the ``ssl`` module.
..
.. bpo: 36144
.. date: 2020-03-18-14-51-41
.. nonce: lQm_RK
.. section: Library
Added :pep:`584` operators to :class:`weakref.WeakValueDictionary`.
..
.. bpo: 36144
.. date: 2020-03-18-14-02-58
.. nonce: ooyn6Z
.. section: Library
Added :pep:`584` operators to :class:`weakref.WeakKeyDictionary`.
..
.. bpo: 38891
.. date: 2020-03-15-08-06-05
.. nonce: 56Yokh
.. section: Library
Fix linear runtime behaviour of the ``__getitem__`` and ``__setitem__`` methods
in :class:`multiprocessing.shared_memory.ShareableList`. This avoids
quadratic performance when iterating a ``ShareableList``. Patch by Thomas
Krennwallner.
..
.. bpo: 39682
.. date: 2020-03-08-11-00-01
.. nonce: AxXZNz
.. section: Library
Remove undocumented support for *closing* a ``pathlib.Path`` object via its
context manager. The context manager magic methods remain, but they are now
a no-op, making ``Path`` objects immutable.
..
.. bpo: 36144
.. date: 2020-03-07-11-26-08
.. nonce: FG9jqy
.. section: Library
Added :pep:`584` operators (``|`` and ``|=``) to
:class:`collections.ChainMap`.
..
.. bpo: 39011
.. date: 2020-02-12-01-48-51
.. nonce: hGve_t
.. section: Library
Normalization of line endings in ElementTree attributes was removed, as line
endings which were replaced by entity numbers should be preserved in
original form.
..
.. bpo: 38410
.. date: 2019-10-09-08-14-25
.. nonce: _YyoMV
.. section: Library
Properly handle :func:`sys.audit` failures in
:func:`sys.set_asyncgen_hooks`.
..
.. bpo: 36541
.. date: 2019-06-18-19-38-27
.. nonce: XI8mi1
.. section: Library
lib2to3 now recognizes named assignment expressions (the walrus operator,
``:=``)
..
.. bpo: 35967
.. date: 2019-04-14-14-11-07
.. nonce: KUMT9E
.. section: Library
In platform, delay the invocation of 'uname -p' until the processor
attribute is requested.
..
.. bpo: 35113
.. date: 2018-11-03-16-18-20
.. nonce: vwvWKG
.. section: Library
:meth:`inspect.getsource` now returns correct source code for inner class
with same name as module level class. Decorators are also returned as part
of source of the class. Patch by Karthikeyan Singaravelan.
..
.. bpo: 33262
.. date: 2018-04-17-13-23-29
.. nonce: vHC7YQ
.. section: Library
Deprecate passing None as an argument for :func:`shlex.split`'s ``s``
parameter.  Patch by Zackery Spytz.
..
.. bpo: 31758
.. date: 2017-10-14-21-02-40
.. nonce: 563ZZb
.. section: Library
Prevent crashes when using an uninitialized ``_elementtree.XMLParser``
object. Patch by Oren Milman.
..
.. bpo: 27635
.. date: 2020-04-01-00-27-03
.. nonce: VwxUty
.. section: Documentation
The pickle documentation incorrectly claimed that ``__new__`` isn't called
by default when unpickling.
..
.. bpo: 39879
.. date: 2020-03-16-18-12-02
.. nonce: CnQ7Cv
.. section: Documentation
Updated :ref:`datamodel` docs to include :func:`dict` insertion order
preservation. Patch by Furkan Onder and Samy Lahfa.
..
.. bpo: 38387
.. date: 2019-10-06-23-44-15
.. nonce: fZoq0S
.. section: Documentation
Document :c:macro:`PyDoc_STRVAR` macro in the C-API reference.
..
.. bpo: 13743
.. date: 2019-09-25-23-20-55
.. nonce: 5ToLDy
.. section: Documentation
Some methods within xml.dom.minidom.Element class are now better documented.
..
.. bpo: 31904
.. date: 2020-04-09-16-29-18
.. nonce: ej348T
.. section: Tests
Set expected default encoding in test_c_locale_coercion.py for VxWorks RTOS.
..
.. bpo: 40162
.. date: 2020-04-03-02-40-16
.. nonce: v3pQW_
.. section: Tests
Update Travis CI configuration to OpenSSL 1.1.1f.
..
.. bpo: 40146
.. date: 2020-04-02-02-14-37
.. nonce: J-Yo9G
.. section: Tests
Update OpenSSL to 1.1.1f in Azure Pipelines.
..
.. bpo: 40094
.. date: 2020-03-31-18-57-52
.. nonce: m3fTJe
.. section: Tests
Add :func:`test.support.wait_process` function.
..
.. bpo: 40003
.. date: 2020-03-31-16-07-15
.. nonce: SOruLY
.. section: Tests
``test.bisect_cmd`` now copies Python command line options like ``-O`` or
``-W``. Moreover, emit a warning if ``test.bisect_cmd`` is used with
``-w``/``--verbose2`` option.
..
.. bpo: 39380
.. date: 2020-03-22-20-00-04
.. nonce: ZXlRQU
.. section: Tests
Add the encoding in :class:`ftplib.FTP` and :class:`ftplib.FTP_TLS` to the
constructor as keyword-only and change the default from ``latin-1`` to
``utf-8`` to follow :rfc:`2640`.
..
.. bpo: 39793
.. date: 2020-02-29-12-58-17
.. nonce: Og2SUN
.. section: Tests
Use the same domain when testing ``make_msgid``. Patch by Batuhan Taskaya.
..
.. bpo: 1812
.. date: 2019-11-25-21-46-47
.. nonce: sAbTbY
.. section: Tests
Fix newline handling in doctest.testfile when loading from a package whose
loader has a get_data method. Patch by Peter Donis.
..
.. bpo: 38360
.. date: 2020-04-22-02-33-54
.. nonce: 74C68u
.. section: Build
Support single-argument form of macOS -isysroot flag.
..
.. bpo: 40158
.. date: 2020-04-03-17-54-33
.. nonce: MWUTs4
.. section: Build
Fix CPython MSBuild Properties in NuGet Package (build/native/python.props)
..
.. bpo: 38527
.. date: 2020-03-28-10-43-09
.. nonce: fqCRgD
.. section: Build
Fix configure check on Solaris for "float word ordering": sometimes, the
correct "grep" command was not being used. Patch by Arnon Yaari.
..
.. bpo: 40164
.. date: 2020-04-04-13-13-44
.. nonce: SPrSn5
.. section: Windows
Updates Windows to OpenSSL 1.1.1f
..
.. bpo: 8901
.. date: 2020-01-24-09-15-41
.. nonce: hVnhGO
.. section: Windows
Ignore the Windows registry when the ``-E`` option is used.
..
.. bpo: 38329
.. date: 2020-04-22-03-39-22
.. nonce: H0a8JV
.. section: macOS
python.org macOS installers now update the Current version symlink of
/Library/Frameworks/Python.framework/Versions for 3.9 installs. Previously,
Current was only updated for Python 2.x installs. This should make it easier
to embed Python 3 into other macOS applications.
..
.. bpo: 40164
.. date: 2020-04-21-19-46-35
.. nonce: 6HA6IC
.. section: macOS
Update macOS installer builds to use OpenSSL 1.1.1g.
..
.. bpo: 38439
.. date: 2019-12-05-14-20-53
.. nonce: j_L2PI
.. section: IDLE
Add a 256×256 pixel IDLE icon to support more modern environments. Created
by Andrew Clover. Delete the unused macOS idle.icns icon file.
..
.. bpo: 38689
.. date: 2019-11-14-12-59-19
.. nonce: Lgfxva
.. section: IDLE
IDLE will no longer freeze when inspect.signature fails when fetching a
calltip.
..
.. bpo: 40385
.. date: 2020-04-24-21-08-19
.. nonce: nWIQdq
.. section: Tools/Demos
Removed the checkpyc.py tool. Please see compileall without force mode as a
potential alternative.
..
.. bpo: 40179
.. date: 2020-04-04-19-35-22
.. nonce: u9FH10
.. section: Tools/Demos
Fixed translation of ``#elif`` in Argument Clinic.
..
.. bpo: 40094
.. date: 2020-04-02-01-22-21
.. nonce: 1XQQF6
.. section: Tools/Demos
Fix ``which.py`` script exit code: it now uses
:func:`os.waitstatus_to_exitcode` to convert :func:`os.system` exit status
into an exit code.
..
.. bpo: 40241
.. date: 2020-04-13-02-56-24
.. nonce: _FOf7E
.. section: C API
Move the :c:type:`!PyGC_Head` structure to the internal C API.
..
.. bpo: 40170
.. date: 2020-04-11-06-12-44
.. nonce: cmM9oK
.. section: C API
Convert :c:func:`PyObject_IS_GC` macro to a function to hide implementation
details.
..
.. bpo: 40241
.. date: 2020-04-10-19-43-04
.. nonce: Xm3w-1
.. section: C API
Add the functions :c:func:`PyObject_GC_IsTracked` and
:c:func:`PyObject_GC_IsFinalized` to the public API to allow to query if
Python objects are being currently tracked or have been already finalized by
the garbage collector respectively. Patch by Pablo Galindo.
..
.. bpo: 40170
.. date: 2020-04-05-00-37-34
.. nonce: Seuh3D
.. section: C API
The :c:func:`!PyObject_NEW` macro becomes an alias to the
:c:func:`PyObject_New` macro, and the :c:func:`!PyObject_NEW_VAR` macro
becomes an alias to the :c:func:`PyObject_NewVar` macro, to hide
implementation details. They no longer access directly the
:c:member:`PyTypeObject.tp_basicsize` member.
..
.. bpo: 40170
.. date: 2020-04-05-00-21-38
.. nonce: Tx0vy6
.. section: C API
:c:func:`PyType_HasFeature` now always calls :c:func:`PyType_GetFlags` to
hide implementation details. Previously, it accessed directly the
:c:member:`PyTypeObject.tp_flags` member when the limited C API was not
used.
..
.. bpo: 40170
.. date: 2020-04-05-00-10-45
.. nonce: 6nFYbY
.. section: C API
Convert the :c:func:`!PyObject_GET_WEAKREFS_LISTPTR` macro to a function to
hide implementation details: the macro accessed directly to the
:c:member:`PyTypeObject.tp_weaklistoffset` member.
..
.. bpo: 40170
.. date: 2020-04-05-00-02-13
.. nonce: IFsGZ-
.. section: C API
Convert :c:func:`PyObject_CheckBuffer` macro to a function to hide
implementation details: the macro accessed directly the
:c:member:`PyTypeObject.tp_as_buffer` member.
..
.. bpo: 40170
.. date: 2020-04-04-23-51-59
.. nonce: uXQ701
.. section: C API
Always declare :c:func:`PyIndex_Check` as an opaque function to hide
implementation details: remove ``PyIndex_Check()`` macro. The macro accessed
directly the :c:member:`PyTypeObject.tp_as_number` member.
..
.. bpo: 39947
.. date: 2020-03-25-19-44-55
.. nonce: 2OxvPt
.. section: C API
Add :c:func:`PyThreadState_GetID` function: get the unique identifier of a
Python thread state.

.. bpo: 22980
.. date: 9109
.. nonce: Lu_y6y
.. release date: 2015-04-19
.. section: Core and Builtins
Under Linux, GNU/KFreeBSD and the Hurd, C extensions now include the
architecture triplet in the extension name, to make it easy to test builds
for different ABIs in the same working tree.  Under OS X, the extension name
now includes :pep:`3149`-style information.
..
.. bpo: 22631
.. date: 9108
.. nonce: nTx_ZF
.. section: Core and Builtins
Added Linux-specific socket constant CAN_RAW_FD_FRAMES. Patch courtesy of
Joe Jevnik.
..
.. bpo: 23731
.. date: 9107
.. nonce: FOXb37
.. section: Core and Builtins
Implement :pep:`488`: removal of .pyo files.
..
.. bpo: 23726
.. date: 9106
.. nonce: ZopTQ0
.. section: Core and Builtins
Don't enable GC for user subclasses of non-GC types that don't add any new
fields.  Patch by Eugene Toder.
..
.. bpo: 23309
.. date: 9105
.. nonce: Wfnsnz
.. section: Core and Builtins
Avoid a deadlock at shutdown if a daemon thread is aborted while it is
holding a lock to a buffered I/O object, and the main thread tries to use
the same I/O object (typically stdout or stderr).  A fatal error is emitted
instead.
..
.. bpo: 22977
.. date: 9104
.. nonce: hutEse
.. section: Core and Builtins
Fixed formatting Windows error messages on Wine. Patch by Martin Panter.
..
.. bpo: 23466
.. date: 9103
.. nonce: KhMltK
.. section: Core and Builtins
%c, %o, %x, and %X in bytes formatting now raise TypeError on non-integer
input.
..
.. bpo: 24044
.. date: 9102
.. nonce: H7vb6-
.. section: Core and Builtins
Fix possible null pointer dereference in list.sort in out of memory
conditions.
..
.. bpo: 21354
.. date: 9101
.. nonce: ZZTe1E
.. section: Core and Builtins
PyCFunction_New function is exposed by python DLL again.
..
.. bpo: 23840
.. date: 9100
.. nonce: mtSbqO
.. section: Library
tokenize.open() now closes the temporary binary file on error to fix a
resource warning.
..
.. bpo: 16914
.. date: 9099
.. nonce: GrP2Jr
.. section: Library
new debuglevel 2 in smtplib adds timestamps to debug output.
..
.. bpo: 7159
.. date: 9098
.. nonce: KCgOUm
.. section: Library
urllib.request now supports sending auth credentials automatically after the
first 401.  This enhancement is a superset of the enhancement from issue
#19494 and supersedes that change.
..
.. bpo: 23703
.. date: 9097
.. nonce: kYybxm
.. section: Library
Fix a regression in urljoin() introduced in 901e4e52b20a. Patch by Demian
Brecht.
..
.. bpo: 4254
.. date: 9096
.. nonce: eUC_2H
.. section: Library
Adds _curses.update_lines_cols().  Patch by Arnon Yaari
..
.. bpo: 19933
.. date: 9095
.. nonce: Qq8utk
.. section: Library
Provide default argument for ndigits in round. Patch by Vajrasky Kok.
..
.. bpo: 23193
.. date: 9094
.. nonce: n5ahcG
.. section: Library
Add a numeric_owner parameter to tarfile.TarFile.extract and
tarfile.TarFile.extractall. Patch by Michael Vogt and Eric Smith.
..
.. bpo: 23342
.. date: 9093
.. nonce: CbSzYI
.. section: Library
Add a subprocess.run() function than returns a CalledProcess instance for a
more consistent API than the existing call* functions.
..
.. bpo: 21217
.. date: 9092
.. nonce: TkFTlk
.. section: Library
inspect.getsourcelines() now tries to compute the start and end lines from
the code object, fixing an issue when a lambda function is used as decorator
argument. Patch by Thomas Ballinger and Allison Kaptur.
..
.. bpo: 24521
.. date: 9091
.. nonce: bn4U-y
.. section: Library
Fix possible integer overflows in the pickle module.
..
.. bpo: 22931
.. date: 9090
.. nonce: 4CuWYD
.. section: Library
Allow '[' and ']' in cookie values.
..
.. bpo: 0
.. date: 9089
.. nonce: fgX8Qe
.. section: Library
The keywords attribute of functools.partial is now always a dictionary.
..
.. bpo: 23811
.. date: 9088
.. nonce: B6tzf9
.. section: Library
Add missing newline to the PyCompileError error message. Patch by Alex
Shkop.
..
.. bpo: 21116
.. date: 9087
.. nonce: Orft3K
.. section: Library
Avoid blowing memory when allocating a multiprocessing shared array that's
larger than 50% of the available RAM.  Patch by Médéric Boquien.
..
.. bpo: 22982
.. date: 9086
.. nonce: xYmG62
.. section: Library
Improve BOM handling when seeking to multiple positions of a writable text
file.
..
.. bpo: 23464
.. date: 9085
.. nonce: _XGkBk
.. section: Library
Removed deprecated asyncio JoinableQueue.
..
.. bpo: 23529
.. date: 9084
.. nonce: Hr7AHH
.. section: Library
Limit the size of decompressed data when reading from GzipFile, BZ2File or
LZMAFile.  This defeats denial of service attacks using compressed bombs
(i.e. compressed payloads which decompress to a huge size).  Patch by Martin
Panter and Nikolaus Rath.
..
.. bpo: 21859
.. date: 9083
.. nonce: GYrUNP
.. section: Library
Added Python implementation of io.FileIO.
..
.. bpo: 23865
.. date: 9082
.. nonce: PtSLgU
.. section: Library
close() methods in multiple modules now are idempotent and more robust at
shutdown. If they need to release multiple resources, all are released even
if errors occur.
..
.. bpo: 23400
.. date: 9081
.. nonce: JSh9Z3
.. section: Library
Raise same exception on both Python 2 and 3 if sem_open is not available.
Patch by Davin Potts.
..
.. bpo: 10838
.. date: 9080
.. nonce: p9tSPC
.. section: Library
The subprocess now module includes SubprocessError and TimeoutError in its
list of exported names for the users wild enough to use ``from subprocess
import *``.
..
.. bpo: 23411
.. date: 9079
.. nonce: 0im3Qw
.. section: Library
Added DefragResult, ParseResult, SplitResult, DefragResultBytes,
ParseResultBytes, and SplitResultBytes to urllib.parse.__all__. Patch by
Martin Panter.
..
.. bpo: 23881
.. date: 9078
.. nonce: yZjl4b
.. section: Library
urllib.request.ftpwrapper constructor now closes the socket if the FTP
connection failed to fix a ResourceWarning.
..
.. bpo: 23853
.. date: 9077
.. nonce: mNY1eI
.. section: Library
:meth:`socket.socket.sendall` does no more reset the socket timeout each
time data is sent successfully. The socket timeout is now the maximum total
duration to send all data.
..
.. bpo: 22721
.. date: 9076
.. nonce: MVfBL9
.. section: Library
An order of multiline pprint output of set or dict containing orderable and
non-orderable elements no longer depends on iteration order of set or dict.
..
.. bpo: 15133
.. date: 9075
.. nonce: C0QfV8
.. section: Library
_tkinter.tkapp.getboolean() now supports Tcl_Obj and always returns bool.
tkinter.BooleanVar now validates input values (accepted bool, int, str, and
Tcl_Obj).  tkinter.BooleanVar.get() now always returns bool.
..
.. bpo: 10590
.. date: 9074
.. nonce: nkxXfU
.. section: Library
xml.sax.parseString() now supports string argument.
..
.. bpo: 23338
.. date: 9073
.. nonce: ZYMGN1
.. section: Library
Fixed formatting ctypes error messages on Cygwin. Patch by Makoto Kato.
..
.. bpo: 15582
.. date: 9072
.. nonce: 26wJNk
.. section: Library
inspect.getdoc() now follows inheritance chains.
..
.. bpo: 2175
.. date: 9071
.. nonce: cHiVOp
.. section: Library
SAX parsers now support a character stream of InputSource object.
..
.. bpo: 16840
.. date: 9070
.. nonce: kKIhPm
.. section: Library
Tkinter now supports 64-bit integers added in Tcl 8.4 and arbitrary
precision integers added in Tcl 8.5.
..
.. bpo: 23834
.. date: 9069
.. nonce: fX3TF4
.. section: Library
Fix socket.sendto(), use the C Py_ssize_t type to store the result of
sendto() instead of the C int type.
..
.. bpo: 23618
.. date: 9068
.. nonce: Of_q5t
.. section: Library
:meth:`socket.socket.connect` now waits until the connection completes
instead of raising :exc:`InterruptedError` if the connection is interrupted
by signals, signal handlers don't raise an exception and the socket is
blocking or has a timeout. :meth:`socket.socket.connect` still raise
:exc:`InterruptedError` for non-blocking sockets.
..
.. bpo: 21526
.. date: 9067
.. nonce: QQEXrR
.. section: Library
Tkinter now supports new boolean type in Tcl 8.5.
..
.. bpo: 23836
.. date: 9066
.. nonce: zrEmlR
.. section: Library
Fix the faulthandler module to handle reentrant calls to its signal
handlers.
..
.. bpo: 23838
.. date: 9065
.. nonce: IX6FPX
.. section: Library
linecache now clears the cache and returns an empty result on MemoryError.
..
.. bpo: 10395
.. date: 9064
.. nonce: fi_lZp
.. section: Library
Added os.path.commonpath(). Implemented in posixpath and ntpath. Based on
patch by Rafik Draoui.
..
.. bpo: 23611
.. date: 9063
.. nonce: QkBJVB
.. section: Library
Serializing more "lookupable" objects (such as unbound methods or nested
classes) now are supported with pickle protocols < 4.
..
.. bpo: 13583
.. date: 9062
.. nonce: -MPBjZ
.. section: Library
sqlite3.Row now supports slice indexing.
..
.. bpo: 18473
.. date: 9061
.. nonce: 89RHm-
.. section: Library
Fixed 2to3 and 3to2 compatible pickle mappings.  Fixed ambiguous reverse
mappings.  Added many new mappings.  Import mapping is no longer applied to
modules already mapped with full name mapping.
..
.. bpo: 23485
.. date: 9060
.. nonce: kQWN6L
.. section: Library
select.select() is now retried automatically with the recomputed timeout
when interrupted by a signal, except if the signal handler raises an
exception. This change is part of the :pep:`475`.
..
.. bpo: 23752
.. date: 9059
.. nonce: 5fbVNb
.. section: Library
When built from an existing file descriptor, io.FileIO() now only calls
fstat() once. Before fstat() was called twice, which was not necessary.
..
.. bpo: 23704
.. date: 9058
.. nonce: Ggjvm8
.. section: Library
collections.deque() objects now support __add__, __mul__, and __imul__().
..
.. bpo: 23171
.. date: 9057
.. nonce: b6PBzM
.. section: Library
csv.Writer.writerow() now supports arbitrary iterables.
..
.. bpo: 23745
.. date: 9056
.. nonce: E00Bml
.. section: Library
The new email header parser now handles duplicate MIME parameter names
without error, similar to how get_param behaves.
..
.. bpo: 22117
.. date: 9055
.. nonce: bTO0xx
.. section: Library
Fix os.utime(), it now rounds the timestamp towards minus infinity (-inf)
instead of rounding towards zero.
..
.. bpo: 23310
.. date: 9054
.. nonce: GXmFMR
.. section: Library
Fix MagicMock's initializer to work with __methods__, just like
configure_mock().  Patch by Kasia Jachim.
..
.. bpo: 23817
.. date: 9053
.. nonce: DTmVan
.. section: Build
FreeBSD now uses "1.0" in the SOVERSION as other operating systems, instead
of just "1".
..
.. bpo: 23501
.. date: 9052
.. nonce: iz10e6
.. section: Build
Argument Clinic now generates code into separate files by default.
..
.. bpo: 23799
.. date: 9051
.. nonce: XU2xDw
.. section: Tests
Added test.support.start_threads() for running and cleaning up multiple
threads.
..
.. bpo: 22390
.. date: 9050
.. nonce: UPVFnq
.. section: Tests
test.regrtest now emits a warning if temporary files or directories are left
after running a test.
..
.. bpo: 18128
.. date: 9049
.. nonce: lx2V5a
.. section: Tools/Demos
pygettext now uses standard +NNNN format in the POT-Creation-Date header.
..
.. bpo: 23935
.. date: 9048
.. nonce: JSYowT
.. section: Tools/Demos
Argument Clinic's understanding of format units accepting bytes, bytearrays,
and buffers is now consistent with both the documentation and the
implementation.
..
.. bpo: 23944
.. date: 9047
.. nonce: Q8ZL2s
.. section: Tools/Demos
Argument Clinic now wraps long impl prototypes at column 78.
..
.. bpo: 20586
.. date: 9046
.. nonce: 7BiEkx
.. section: Tools/Demos
Argument Clinic now ensures that functions without docstrings have
signatures.
..
.. bpo: 23492
.. date: 9045
.. nonce: kjIcQW
.. section: Tools/Demos
Argument Clinic now generates argument parsing code with PyArg_Parse instead
of PyArg_ParseTuple if possible.
..
.. bpo: 23500
.. date: 9044
.. nonce: H6_dX_
.. section: Tools/Demos
Argument Clinic is now smarter about generating the "#ifndef" (empty)
definition of the methoddef macro: it's only generated once, even if
Argument Clinic processes the same symbol multiple times, and it's emitted
at the end of all processing rather than immediately after the first use.
..
.. bpo: 23998
.. date: 9043
.. nonce: z7mlLW
.. section: C API
PyImport_ReInitLock() now checks for lock allocation error

.. bpo: 41304
.. date: 2020-07-15-20-15-08
.. nonce: vNEeYA
.. release date: 2020-10-05
.. section: Security
Fixes ``python3x._pth`` being ignored on Windows, caused by the fix for
:issue:`29778` (:cve:`2020-15801`).
..
.. bpo: 41162
.. date: 2020-07-03-20-41-29
.. nonce: tb8pVj
.. section: Security
Audit hooks are now cleared later during finalization to avoid missing
events.
..
.. bpo: 29778
.. date: 2020-07-03-17-21-37
.. nonce: cR_fGS
.. section: Security
Ensure :file:`python3.dll` is loaded from correct locations when Python is
embedded (:cve:`2020-15523`).
..
.. bpo: 41004
.. date: 2020-06-29-16-02-29
.. nonce: ovF0KZ
.. section: Security
The __hash__() methods of  ipaddress.IPv4Interface and
ipaddress.IPv6Interface incorrectly generated constant hash values of 32 and
128 respectively. This resulted in always causing hash collisions. The fix
uses hash() to generate hash values for the tuple of (address, mask length,
network address).
..
.. bpo: 39603
.. date: 2020-02-12-14-17-39
.. nonce: Gt3RSg
.. section: Security
Prevent http header injection by rejecting control characters in
http.client.putrequest(...).
..
.. bpo: 41909
.. date: 2020-10-04-10-55-12
.. nonce: BqHPcm
.. section: Core and Builtins
Fixed stack overflow in :func:`issubclass` and :func:`isinstance` when
getting the ``__bases__`` attribute leads to infinite recursion.
..
.. bpo: 41922
.. date: 2020-10-04-01-02-58
.. nonce: kHGT8I
.. section: Core and Builtins
Speed up calls to ``reversed()`` by using the :pep:`590` ``vectorcall``
calling convention. Patch by Donghee Na.
..
.. bpo: 41873
.. date: 2020-09-28-08-58-28
.. nonce: VzEDhA
.. section: Core and Builtins
Calls to ``float()`` are now faster due to the ``vectorcall`` calling
convention. Patch by Dennis Sweeney.
..
.. bpo: 41870
.. date: 2020-09-27-22-23-14
.. nonce: 2v6_v4
.. section: Core and Builtins
Speed up calls to ``bool()`` by using the :pep:`590` ``vectorcall`` calling
convention. Patch by Donghee Na.
..
.. bpo: 1635741
.. date: 2020-09-26-14-43-30
.. nonce: aJS9B3
.. section: Library
Port the :mod:`!_bisect` module to the multi-phase initialization API
(:pep:`489`).
..
.. bpo: 39934
.. date: 2020-09-24-12-15-45
.. nonce: YVHTCF
.. section: Core and Builtins
Correctly count control blocks in 'except' in compiler. Ensures that a
syntax error, rather a fatal error, occurs for deeply nested, named
exception handlers.
..
.. bpo: 41780
.. date: 2020-09-15-23-29-49
.. nonce: bOBUIH
.. section: Core and Builtins
Fix :meth:`__dir__` of :class:`types.GenericAlias`. Patch by Batuhan
Taskaya.
..
.. bpo: 1635741
.. date: 2020-09-12-18-34-34
.. nonce: lh335O
.. section: Library
Port the :mod:`!_lsprof` extension module to multi-phase initialization
(:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-09-08-21-58-47
.. nonce: vdjSLH
.. section: Library
Port the :mod:`cmath` extension module to multi-phase initialization
(:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-09-08-20-39-43
.. nonce: jiXmyT
.. section: Library
Port the :mod:`!_scproxy` extension module to multi-phase initialization
(:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-09-07-11-35-02
.. nonce: rvIexb
.. section: Library
Port the :mod:`termios` extension module to multi-phase initialization
(:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-09-07-09-45-47
.. nonce: QuDIut
.. section: Library
Convert the :mod:`!_sha256` extension module types to heap types.
..
.. bpo: 41690
.. date: 2020-09-02-12-00-57
.. nonce: Ny-Sfy
.. section: Core and Builtins
Fix a possible stack overflow in the parser when parsing functions and
classes with a huge amount of arguments. Patch by Pablo Galindo.
..
.. bpo: 1635741
.. date: 2020-09-01-17-22-35
.. nonce: CnRME3
.. section: Library
Port the :mod:`!_overlapped` extension module to multi-phase initialization
(:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-09-01-17-08-07
.. nonce: X9CZgo
.. section: Library
Port the :mod:`!_curses_panel` extension module to multi-phase initialization
(:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-09-01-17-06-02
.. nonce: 5jZymK
.. section: Library
Port the :mod:`!_opcode` extension module to multi-phase initialization
(:pep:`489`).
..
.. bpo: 41681
.. date: 2020-08-31-17-49-02
.. nonce: 3-VJiH
.. section: Core and Builtins
Fixes the wrong error description in the error raised by using 2 ``,`` in
format string in f-string and :meth:`str.format`.
..
.. bpo: 41675
.. date: 2020-08-31-14-53-17
.. nonce: VSoqWU
.. section: Library
The implementation of :func:`signal.siginterrupt` now uses
:c:func:`!sigaction` (if it is available in the system) instead of the
deprecated :c:func:`!siginterrupt`. Patch by Pablo Galindo.
..
.. bpo: 41670
.. date: 2020-08-31-11-37-59
.. nonce: vmRJRx
.. section: Core and Builtins
Prevent line trace being skipped on platforms not compiled with
``USE_COMPUTED_GOTOS``. Fixes issue where some lines nested within a
try-except block were not being traced on Windows.
..
.. bpo: 41654
.. date: 2020-08-30-20-38-33
.. nonce: HtnhAM
.. section: Core and Builtins
Fix a crash that occurred when destroying subclasses of
:class:`MemoryError`. Patch by Pablo Galindo.
..
.. bpo: 1635741
.. date: 2020-08-28-20-54-04
.. nonce: 7ijlcI
.. section: Library
Port the :mod:`zlib` extension module to multi-phase initialization
(:pep:`489`).
..
.. bpo: 41631
.. date: 2020-08-26-11-23-31
.. nonce: 3jZcd9
.. section: Core and Builtins
The ``_ast`` module uses again a global state. Using a module state per
module instance is causing subtle practical problems. For example, the
Mercurial project replaces the ``__import__()`` function to implement lazy
import, whereas Python expected that ``import _ast`` always return a fully
initialized ``_ast`` module.
..
.. bpo: 40077
.. date: 2020-08-25-22-43-33
.. nonce: vcxSUa
.. section: Library
Convert :mod:`!_operator` to use :c:func:`PyType_FromSpec`.
..
.. bpo: 1653741
.. date: 2020-08-13-07-19-21
.. nonce: fubBkb
.. section: Core and Builtins
Port :mod:`!_sha3` to multi-phase init.  Convert static types to heap types.
..
.. bpo: 1635741
.. date: 2020-08-13-07-18-05
.. nonce: FC13e7
.. section: Library
Port the :mod:`!_blake2` extension module to the multi-phase initialization
API (:pep:`489`).
..
.. bpo: 41533
.. date: 2020-08-12-20-29-57
.. nonce: 4pcVAc
.. section: Core and Builtins
Free the stack allocated in ``va_build_stack`` if ``do_mkstack`` fails and
the stack is not a ``small_stack``.
..
.. bpo: 41531
.. date: 2020-08-12-19-32-15
.. nonce: WgPzjT
.. section: Core and Builtins
Fix a bug that was dropping keys when compiling dict literals with more than
0xFFFF elements. Patch by Pablo Galindo.
..
.. bpo: 41525
.. date: 2020-08-12-07-35-07
.. nonce: d9q3XL
.. section: Core and Builtins
The output of ``python --help`` contains now only ASCII characters.
..
.. bpo: 1635741
.. date: 2020-08-10-16-11-32
.. nonce: O0d3ym
.. section: Library
Port the :mod:`!_sha1`, :mod:`!_sha512`, and :mod:`!_md5` extension modules to
multi-phase initialization API (:pep:`489`).
..
.. bpo: 41431
.. date: 2020-08-02-15-53-12
.. nonce: TblUBT
.. section: Core and Builtins
Optimize ``dict_merge()`` for copying dict (e.g. ``dict(d)`` and
``{}.update(d)``).
..
.. bpo: 41428
.. date: 2020-07-28-22-43-27
.. nonce: FM6xsI
.. section: Core and Builtins
Implement PEP 604. This supports (int | str) etc. in place of Union[str,
int].
..
.. bpo: 41340
.. date: 2020-07-27-01-50-06
.. nonce: pZXfcF
.. section: Core and Builtins
Removed fallback implementation for ``strdup``.
..
.. bpo: 38156
.. date: 2020-07-20-17-01-17
.. nonce: ptcdRy
.. section: Core and Builtins
Handle interrupts that come after EOF correctly in ``PyOS_StdioReadline``.
..
.. bpo: 41342
.. date: 2020-07-19-15-40-52
.. nonce: RRk_m_
.. section: Core and Builtins
:func:`round` with integer argument is now faster (9--60%).
..
.. bpo: 41334
.. date: 2020-07-18-18-01-10
.. nonce: t5xMGp
.. section: Core and Builtins
Constructors :func:`str`, :func:`bytes` and :func:`bytearray` are now faster
(around 30--40% for small objects).
..
.. bpo: 41295
.. date: 2020-07-18-08-15-32
.. nonce: pu8Ezo
.. section: Core and Builtins
Resolve a regression in CPython 3.8.4 where defining "__setattr__" in a
multi-inheritance setup and calling up the hierarchy chain could fail if
builtins/extension types were involved in the base types.
..
.. bpo: 41323
.. date: 2020-07-17-11-31-54
.. nonce: ChbZHh
.. section: Core and Builtins
Bytecode optimizations are performed directly on the control flow graph.
This will result in slightly more compact code objects in some
circumstances.
..
.. bpo: 41247
.. date: 2020-07-08-22-03-54
.. nonce: PndYIk
.. section: Core and Builtins
Always cache the running loop holder when running
``asyncio.set_running_loop``.
..
.. bpo: 41252
.. date: 2020-07-08-21-55-23
.. nonce: nBWL-Y
.. section: Core and Builtins
Fix incorrect refcounting in _ssl.c's ``_servername_callback()``.
..
.. bpo: 1635741
.. date: 2020-07-07-16-10-52
.. nonce: zU-H_n
.. section: Core and Builtins
Port :mod:`multiprocessing` to multi-phase initialization
..
.. bpo: 1635741
.. date: 2020-07-06-20-43-19
.. nonce: LYhsni
.. section: Library
Port :mod:`winapi` to multiphase initialization
..
.. bpo: 41215
.. date: 2020-07-06-18-36-33
.. nonce: vFGFIz
.. section: Core and Builtins
Use non-NULL default values in the PEG parser keyword list to overcome a bug
that was preventing Python from being properly compiled when using the XLC
compiler. Patch by Pablo Galindo.
..
.. bpo: 41218
.. date: 2020-07-06-13-35-17
.. nonce: oKnSr2
.. section: Core and Builtins
Python 3.8.3 had a regression where compiling with
ast.PyCF_ALLOW_TOP_LEVEL_AWAIT would aggressively mark list comprehension
with CO_COROUTINE. Now only list comprehension making use of async/await
will tagged as so.
..
.. bpo: 1635741
.. date: 2020-07-03-23-10-02
.. nonce: F5coWe
.. section: Library
Port :mod:`faulthandler` to multiphase initialization.
..
.. bpo: 1635741
.. date: 2020-07-01-20-17-38
.. nonce: -AtPYu
.. section: Library
Port :mod:`sha256` to multiphase initialization
..
.. bpo: 41175
.. date: 2020-06-30-20-17-31
.. nonce: acJoXB
.. section: Core and Builtins
Guard against a NULL pointer dereference within bytearrayobject triggered by
the ``bytearray() + bytearray()`` operation.
..
.. bpo: 41100
.. date: 2020-06-30-04-44-29
.. nonce: PJwA6F
.. section: Core and Builtins
add arm64 to the allowable Mac OS arches in mpdecimal.h
..
.. bpo: 41094
.. date: 2020-06-23-23-26-42
.. nonce: zEIJse
.. section: Core and Builtins
Fix decoding errors with audit when open files with non-ASCII names on
non-UTF-8 locale.
..
.. bpo: 39960
.. date: 2020-06-23-18-32-41
.. nonce: Kez3fP
.. section: Core and Builtins
The "hackcheck" that prevents sneaking around a type's __setattr__() by
calling the superclass method was rewritten to allow C implemented heap
types.
..
.. bpo: 41084
.. date: 2020-06-23-15-10-19
.. nonce: pt3y7F
.. section: Core and Builtins
Prefix the error message with 'f-string: ', when parsing an f-string
expression which throws a :exc:`SyntaxError`.
..
.. bpo: 40521
.. date: 2020-06-23-07-35-11
.. nonce: dMNA6k
.. section: Core and Builtins
Empty frozensets are no longer singletons.
..
.. bpo: 41076
.. date: 2020-06-22-13-22-30
.. nonce: eWYw2N
.. section: Core and Builtins
Pre-feed the parser with the location of the f-string expression, not the
f-string itself, which allows us to skip the shifting of the AST node
locations after the parsing is completed.
..
.. bpo: 41056
.. date: 2020-06-21-19-53-33
.. nonce: IDu_EK
.. section: Core and Builtins
Fixes a reference to deallocated stack space during startup when
constructing sys.path involving a relative symlink when code was supplied
via -c.  (discovered via Coverity)
..
.. bpo: 41061
.. date: 2020-06-21-10-54-02
.. nonce: AHf9MU
.. section: Core and Builtins
Fix incorrect expressions and asserts in hashtable code and tests.
..
.. bpo: 41052
.. date: 2020-06-20-22-46-18
.. nonce: 46MPeF
.. section: Core and Builtins
Opt out serialization/deserialization for _random.Random
..
.. bpo: 40939
.. date: 2020-06-20-19-27-47
.. nonce: jxJ4yn
.. section: Core and Builtins
Rename ``PyPegen*`` functions to ``PyParser*``, so that we can remove the old
set of ``PyParser*`` functions that were using the old parser, but keep
everything backwards-compatible.
..
.. bpo: 35975
.. date: 2020-06-20-17-00-44
.. nonce: UDHCHp
.. section: Core and Builtins
Stefan Behnel reported that cf_feature_version is used even when
PyCF_ONLY_AST is not set. This is against the intention and against the
documented behavior, so it's been fixed.
..
.. bpo: 40939
.. date: 2020-06-20-16-59-02
.. nonce: 6810Ak
.. section: Core and Builtins
Remove the remaining files from the old parser and the :mod:`symbol` module.
..
.. bpo: 40077
.. date: 2020-06-18-19-04-30
.. nonce: _yI-ax
.. section: Library
Convert :mod:`!_bz2` to use :c:func:`PyType_FromSpec`.
..
.. bpo: 41006
.. date: 2020-06-18-00-07-09
.. nonce: H-wN-d
.. section: Core and Builtins
The ``encodings.latin_1`` module is no longer imported at startup. Now it is
only imported when it is the filesystem encoding or the stdio encoding.
..
.. bpo: 40636
.. date: 2020-06-17-10-27-17
.. nonce: MYaCIe
.. section: Core and Builtins
:func:`zip` now supports :pep:`618`'s ``strict`` parameter, which raises a
:exc:`ValueError` if the arguments are exhausted at different lengths. Patch
by Brandt Bucher.
..
.. bpo: 1635741
.. date: 2020-06-17-00-52-21
.. nonce: 61iyYh
.. section: Core and Builtins
Port :mod:`!_gdbm` to multiphase initialization.
..
.. bpo: 40985
.. date: 2020-06-15-16-29-55
.. nonce: IIN_xX
.. section: Core and Builtins
Fix a bug that caused the :exc:`SyntaxError` text to be empty when a file
ends with a line ending in a line continuation character (i.e. backslash).
The error text should contain the text of the last line.
..
.. bpo: 40958
.. date: 2020-06-15-01-20-44
.. nonce: 7O2Wh1
.. section: Core and Builtins
Fix a possible buffer overflow in the PEG parser when gathering information
for emitting syntax errors. Patch by Pablo Galindo.
..
.. bpo: 1635741
.. date: 2020-06-12-22-56-17
.. nonce: mmlp3Q
.. section: Core and Builtins
Port :mod:`!_dbm` to multiphase initialization.
..
.. bpo: 40957
.. date: 2020-06-12-12-21-54
.. nonce: Z8n6I6
.. section: Core and Builtins
Fix refleak in _Py_fopen_obj() when PySys_Audit() fails
..
.. bpo: 40950
.. date: 2020-06-12-00-12-28
.. nonce: tzMy7m
.. section: Library
Add a state to the :mod:`!nis` module (:pep:`3121`) and apply the multiphase
initialization. Patch by Donghee Na.
..
.. bpo: 40947
.. date: 2020-06-11-16-06-49
.. nonce: 72cZcR
.. section: Core and Builtins
The Python :ref:`Path Configuration <init-path-config>` now takes
:c:member:`PyConfig.platlibdir` in account.
..
.. bpo: 40939
.. date: 2020-06-10-11-27-15
.. nonce: DO-wAI
.. section: Core and Builtins
Remove the old parser, the :mod:`parser` module and all associated support
code, command-line options and environment variables. Patch by Pablo
Galindo.
..
.. bpo: 40847
.. date: 2020-06-09-23-52-32
.. nonce: 4XAACw
.. section: Core and Builtins
Fix a bug where a line with only a line continuation character is not
considered a blank line at tokenizer level. In such cases, more than a
single ``NEWLINE`` token was emitted. The old parser was working around the
issue, but the new parser threw a :exc:`SyntaxError` for valid input due to
this. For example, an empty line following a line continuation character was
interpreted as a :exc:`SyntaxError`.
..
.. bpo: 40890
.. date: 2020-06-09-00-20-13
.. nonce: LoRV-g
.. section: Core and Builtins
Each dictionary view now has a ``mapping`` attribute that provides a
:class:`types.MappingProxyType` wrapping the original dictionary.  Patch
contributed by Dennis Sweeney.
..
.. bpo: 40889
.. date: 2020-06-08-22-46-33
.. nonce: vIBl-W
.. section: Core and Builtins
Improved the performance of symmetric difference operations on dictionary
item views.  Patch by Dennis Sweeney.
..
.. bpo: 40904
.. date: 2020-06-08-01-08-57
.. nonce: 76qQzo
.. section: Core and Builtins
Fix possible segfault in the new PEG parser when parsing f-string containing
yield statements with no value (:code:`f"{yield}"`). Patch by Pablo Galindo
..
.. bpo: 40903
.. date: 2020-06-07-22-50-10
.. nonce: 7dWejS
.. section: Core and Builtins
Fixed a possible segfault in the new PEG parser when producing error
messages for invalid assignments of the form :code:`p=p=`. Patch by Pablo
Galindo
..
.. bpo: 40880
.. date: 2020-06-06-00-23-19
.. nonce: fjdzSh
.. section: Core and Builtins
Fix invalid memory read in the new parser when checking newlines in string
literals. Patch by Pablo Galindo.
..
.. bpo: 40883
.. date: 2020-06-05-23-25-00
.. nonce: M6sQ-Q
.. section: Core and Builtins
Fix memory leak in when parsing f-strings in the new parser. Patch by Pablo
Galindo
..
.. bpo: 40870
.. date: 2020-06-05-12-48-28
.. nonce: 9cd2sk
.. section: Core and Builtins
Raise :exc:`ValueError` when validating custom AST's where the constants
``True``, ``False`` and ``None`` are used within a :class:`ast.Name` node.
..
.. bpo: 40854
.. date: 2020-06-03-13-53-24
.. nonce: O6vfQU
.. section: Core and Builtins
Allow overriding :data:`sys.platlibdir` via a new :envvar:`PYTHONPLATLIBDIR`
environment variable.
..
.. bpo: 40826
.. date: 2020-06-01-20-31-07
.. nonce: XCI4M2
.. section: Core and Builtins
Fix GIL usage in :c:func:`PyOS_Readline`: lock the GIL to set an exception
and pass the Python thread state when checking if there is a pending signal.
..
.. bpo: 1635741
.. date: 2020-05-30-23-23-35
.. nonce: 0D-laM
.. section: Core and Builtins
Port :mod:`fcntl` to multiphase initialization.
..
.. bpo: 19468
.. date: 2020-05-30-23-18-35
.. nonce: S-TA7p
.. section: Core and Builtins
Delete unnecessary instance check in importlib.reload(). Patch by Furkan
Önder.
..
.. bpo: 40824
.. date: 2020-05-30-14-37-18
.. nonce: XR3V5s
.. section: Core and Builtins
Unexpected errors in calling the ``__iter__`` method are no longer masked by
``TypeError`` in the :keyword:`in` operator and functions
:func:`~operator.contains`, :func:`~operator.indexOf` and
:func:`~operator.countOf` of the :mod:`operator` module.
..
.. bpo: 40792
.. date: 2020-05-27-22-37-58
.. nonce: WEDqqU
.. section: Core and Builtins
Attributes ``start``, ``stop`` and ``step`` of the :class:`range` object now
always has exact type :class:`int`.  Previously, they could have been an
instance of a subclass of ``int``.
..
.. bpo: 40780
.. date: 2020-05-26-17-43-58
.. nonce: 3Ckdgm
.. section: Core and Builtins
Fix a corner case where g-style string formatting of a float failed to
remove trailing zeros.
..
.. bpo: 38964
.. date: 2020-05-25-21-49-11
.. nonce: lrml90
.. section: Core and Builtins
When there's a :exc:`SyntaxError` in the expression part of an fstring, the
filename attribute of the :exc:`SyntaxError` gets correctly set to the name
of the file the fstring resides in.
..
.. bpo: 40750
.. date: 2020-05-24-02-42-26
.. nonce: ZmO9Ev
.. section: Core and Builtins
Support the "-d" debug flag in the new PEG parser. Patch by Pablo Galindo
..
.. bpo: 40217
.. date: 2020-05-23-01-15-51
.. nonce: jZsHTc
.. section: Core and Builtins
Instances of types created with :c:func:`PyType_FromSpecWithBases` will no
longer automatically visit their class object when traversing references in
the garbage collector. The user is expected to manually visit the object's
class. Patch by Pablo Galindo.
..
.. bpo: 39573
.. date: 2020-05-22-00-34-34
.. nonce: QO2QHj
.. section: Core and Builtins
:c:func:`Py_TYPE()` is changed to the inline static function. Patch by
Donghee Na.
..
.. bpo: 40696
.. date: 2020-05-21-01-54-00
.. nonce: u3n8Wx
.. section: Core and Builtins
Fix a hang that can arise after :meth:`generator.throw` due to a cycle in
the exception context chain.
..
.. bpo: 40521
.. date: 2020-05-20-01-17-34
.. nonce: wvAehI
.. section: Core and Builtins
Each interpreter now its has own free lists, singletons and caches:
* Free lists: float, tuple, list, dict, frame, context,
asynchronous generator, MemoryError.
* Singletons: empty tuple, empty bytes string, empty Unicode string,
single byte character, single Unicode (latin1) character.
* Slice cache.
They are no longer shared by all interpreters.
..
.. bpo: 40679
.. date: 2020-05-19-19-39-49
.. nonce: SVzz9p
.. section: Core and Builtins
Certain :exc:`TypeError` messages about missing or extra arguments now
include the function's :term:`qualified name`.  Patch by Dennis Sweeney.
..
.. bpo: 29590
.. date: 2020-05-03-22-26-00
.. nonce: aRz3l7
.. section: Core and Builtins
Make the stack trace correct after calling :meth:`generator.throw` on a
generator that has yielded from a ``yield from``.
..
.. bpo: 4022
.. date: 2020-04-11-13-07-49
.. nonce: Ctpn_F
.. section: Core and Builtins
Improve performance of generators by not raising internal StopIteration.
..
.. bpo: 1635741
.. date: 2020-04-10-23-54-57
.. nonce: ZURqoN
.. section: Library
Port :mod:`mmap` to multiphase initialization.
..
.. bpo: 1635741
.. date: 2020-04-05-02-35-08
.. nonce: Kfe9fT
.. section: Library
Port :mod:`!_lzma` to multiphase initialization.
..
.. bpo: 37999
.. date: 2019-09-01-14-26-02
.. nonce: XPl6dn
.. section: Core and Builtins
Builtin and extension functions that take integer arguments no longer accept
:class:`~decimal.Decimal`\ s, :class:`~fractions.Fraction`\ s and other
objects that can be converted to integers only with a loss (e.g. that have
the :meth:`~object.__int__` method but do not have the
:meth:`~object.__index__` method).
..
.. bpo: 29882
.. date: 2019-06-02-11-29-15
.. nonce: AkRzjb
.. section: Core and Builtins
Add :meth:`int.bit_count`, counting the number of ones in the binary
representation of an integer. Patch by Niklas Fiekas.
..
.. bpo: 36982
.. date: 2019-05-25-05-27-39
.. nonce: 0UHgfB
.. section: Library
Use ncurses extended color functions when available to support terminals
with 256 colors, and add the new function
:func:`curses.has_extended_color_support` to indicate whether extended color
support is provided by the underlying ncurses library.
..
.. bpo: 19569
.. date: 2018-08-29-15-57-07
.. nonce: RGu2Kb
.. section: Core and Builtins
Add the private macros ``_Py_COMP_DIAG_PUSH``,
``_Py_COMP_DIAG_IGNORE_DEPR_DECLS``, and ``_Py_COMP_DIAG_POP``.
..
.. bpo: 26680
.. date: 2018-03-15-11-51-36
.. nonce: wOWYps
.. section: Core and Builtins
The int type now supports the x.is_integer() method for compatibility with
float.
..
.. bpo: 41900
.. date: 2020-10-01-10-50-12
.. nonce: Cho7oh
.. section: Library
C14N 2.0 serialisation in xml.etree.ElementTree failed for unprefixed
attributes when a default namespace was defined.
..
.. bpo: 41887
.. date: 2020-09-30-23-49-42
.. nonce: -ee2S-
.. section: Library
Strip leading spaces and tabs on :func:`ast.literal_eval`. Also document
stripping of spaces and tabs for :func:`eval`.
..
.. bpo: 41773
.. date: 2020-09-28-23-22-25
.. nonce: oKkus0
.. section: Library
Note in documentation that :func:`random.choices` doesn't support non-finite
weights, raise :exc:`ValueError` when given non-finite weights.
..
.. bpo: 41840
.. date: 2020-09-23-23-17-59
.. nonce: QRFr4L
.. section: Library
Fix a bug in the :mod:`symtable` module that was causing module-scope global
variables to not be reported as both local and global. Patch by Pablo
Galindo.
..
.. bpo: 41842
.. date: 2020-09-23-22-52-24
.. nonce: lIuhC9
.. section: Library
Add :func:`codecs.unregister` function to unregister a codec search
function.
..
.. bpo: 40564
.. date: 2020-09-23-03-33-37
.. nonce: iXQqMq
.. section: Library
In ``zipfile.Path``, mutate the passed ZipFile object type instead of making
a copy. Prevents issues when both the local copy and the caller’s copy
attempt to close the same file handle.
..
.. bpo: 40670
.. date: 2020-09-22-14-55-34
.. nonce: R5sm68
.. section: Library
More reliable validation of statements in :class:`timeit.Timer`. It now
accepts "empty" statements (only whitespaces and comments) and rejects
misindentent statements.
..
.. bpo: 41833
.. date: 2020-09-22-13-51-14
.. nonce: 6HVDjT
.. section: Library
The :class:`threading.Thread` constructor now uses the target name if the
*target* argument is specified but the *name* argument is omitted.
..
.. bpo: 41817
.. date: 2020-09-22-00-23-30
.. nonce: bnh-VG
.. section: Library
fix ``tkinter.EventType`` Enum so all members are strings, and none are tuples
..
.. bpo: 41810
.. date: 2020-09-20-15-14-05
.. nonce: 7l8lyV
.. section: Library
:data:`types.EllipsisType`, :data:`types.NotImplementedType` and
:data:`types.NoneType` have been reintroduced, providing a new set of types
readily interpretable by static type checkers.
..
.. bpo: 41815
.. date: 2020-09-19-23-14-54
.. nonce: RNpuX3
.. section: Library
Fix SQLite3 segfault when backing up closed database. Patch contributed by
Peter David McCormick.
..
.. bpo: 41816
.. date: 2020-09-19-12-22-08
.. nonce: ynynXJ
.. section: Library
StrEnum added: it ensures that all members are already strings or string
candidates
..
.. bpo: 41517
.. date: 2020-09-15-22-43-30
.. nonce: sLBH7g
.. section: Library
fix bug allowing Enums to be extended via multiple inheritance
..
.. bpo: 39587
.. date: 2020-09-15-14-56-13
.. nonce: 69xzuh
.. section: Library
use the correct mix-in data type when constructing Enums
..
.. bpo: 41792
.. date: 2020-09-15-07-55-35
.. nonce: qMpSlU
.. section: Library
Add is_typeddict function to typing.py to check if a type is a TypedDict
class
Previously there was no way to check that without using private API. See the
`relevant issue in python/typing
<https://github.com/python/typing/issues/751>`_.
..
.. bpo: 41789
.. date: 2020-09-14-19-27-46
.. nonce: pI_uZQ
.. section: Library
Honor ``object`` overrides in ``Enum`` class creation (specifically, ``__str__``,
``__repr__``, ``__format__``, and ``__reduce_ex__``).
..
.. bpo: 32218
.. date: 2020-09-12-16-18-42
.. nonce: IpYkEe
.. section: Library
``enum.Flag`` and ``enum.IntFlag`` members are now iterable.
..
.. bpo: 39651
.. date: 2020-09-11-12-38-55
.. nonce: JMp9l2
.. section: Library
Fix a race condition in the ``call_soon_threadsafe()`` method of
``asyncio.ProactorEventLoop``: do nothing if the self-pipe socket has been
closed.
..
.. bpo: 1635741
.. date: 2020-09-08-13-55-34
.. nonce: 56MLP-
.. section: Library
Port the ``mashal`` extension module to the multi-phase initialization API
(:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-09-08-13-51-16
.. nonce: wkPeoT
.. section: Library
Port the ``_string`` extension module to the multi-phase initialization API
(:pep:`489`).
..
.. bpo: 41732
.. date: 2020-09-06-20-27-10
.. nonce: 1SKv26
.. section: Library
Added an :term:`iterator` to :class:`memoryview`.
..
.. bpo: 41720
.. date: 2020-09-04-20-45-38
.. nonce: PW9MzZ
.. section: Library
Fixed :meth:`turtle.Vec2D.__rmul__` for arguments which are not int or
float.
..
.. bpo: 41696
.. date: 2020-09-03-01-35-32
.. nonce: zkYGre
.. section: Library
Fix handling of debug mode in :func:`asyncio.run`. This allows setting
``PYTHONASYNCIODEBUG`` or ``-X dev`` to enable asyncio debug mode when using
:func:`asyncio.run`.
..
.. bpo: 41687
.. date: 2020-09-01-15-57-51
.. nonce: m1b1KA
.. section: Library
Fix implementation of sendfile to be compatible with Solaris.
..
.. bpo: 41662
.. date: 2020-08-30-21-38-57
.. nonce: 6e9iZn
.. section: Library
No longer override exceptions raised in ``__len__()`` of a sequence of
parameters in :mod:`sqlite3` with :exc:`~sqlite3.ProgrammingError`.
..
.. bpo: 39010
.. date: 2020-08-30-10-24-26
.. nonce: _mzXJW
.. section: Library
Restarting a ``ProactorEventLoop`` on Windows no longer logs spurious
``ConnectionResetErrors``.
..
.. bpo: 41638
.. date: 2020-08-29-16-45-12
.. nonce: iZfW5N
.. section: Library
:exc:`~sqlite3.ProgrammingError` message for absent parameter in
:mod:`sqlite3` contains now the name of the parameter instead of its index
when parameters are supplied as a dict.
..
.. bpo: 41662
.. date: 2020-08-29-16-07-36
.. nonce: Mn79zh
.. section: Library
Fixed crash when mutate list of parameters during iteration in
:mod:`sqlite3`.
..
.. bpo: 41513
.. date: 2020-08-23-14-23-18
.. nonce: DGqc_I
.. section: Library
Improved the accuracy of math.hypot().  Internally, each step is computed
with extra precision so that the result is now almost always correctly
rounded.
..
.. bpo: 41609
.. date: 2020-08-21-15-51-15
.. nonce: JmiUKG
.. section: Library
The pdb whatis command correctly reports instance methods as 'Method' rather
than 'Function'.
..
.. bpo: 39994
.. date: 2020-08-15-18-17-21
.. nonce: dOgPOh
.. section: Library
Fixed pprint's handling of dict subclasses that override __repr__.
..
.. bpo: 32751
.. date: 2020-08-15-15-50-12
.. nonce: 85je5X
.. section: Library
When cancelling the task due to a timeout, :meth:`asyncio.wait_for` will now
wait until the cancellation is complete also in the case when *timeout* is
<= 0, like it does with positive timeouts.
..
.. bpo: 37658
.. date: 2020-08-15-15-21-40
.. nonce: f9nivB
.. section: Library
:meth:`asyncio.wait_for` now properly handles races between cancellation of
itself and the completion of the wrapped awaitable.
..
.. bpo: 40782
.. date: 2020-08-13-08-07-25
.. nonce: aGZqmB
.. section: Library
Change the method asyncio.AbstractEventLoop.run_in_executor to not be a
coroutine.
..
.. bpo: 41520
.. date: 2020-08-12-13-25-16
.. nonce: BEUWa4
.. section: Library
Fix :mod:`codeop` regression that prevented turning compile warnings into
errors.
..
.. bpo: 41528
.. date: 2020-08-12-07-43-31
.. nonce: bu83oD
.. section: Library
turtle uses math module functions to convert degrees to radians and vice
versa and to calculate vector norm
..
.. bpo: 41513
.. date: 2020-08-09-18-16-05
.. nonce: e6K6EK
.. section: Library
Minor algorithmic improvement to math.hypot() and math.dist() giving small
gains in speed and accuracy.
..
.. bpo: 41503
.. date: 2020-08-07-15-18-16
.. nonce: IYftcu
.. section: Library
Fixed a race between setTarget and flush in logging.handlers.MemoryHandler.
..
.. bpo: 41497
.. date: 2020-08-07-06-06-29
.. nonce: aBtsWz
.. section: Library
Fix potential UnicodeDecodeError in dis module.
..
.. bpo: 41467
.. date: 2020-08-04-00-20-30
.. nonce: Z8DgTL
.. section: Library
On Windows, fix asyncio ``recv_into()`` return value when the socket/pipe is
closed (:exc:`BrokenPipeError`): return ``0`` rather than an empty byte
string (``b''``).
..
.. bpo: 41425
.. date: 2020-08-03-01-59-48
.. nonce: KJo6zF
.. section: Library
Make tkinter doc example runnable.
..
.. bpo: 41421
.. date: 2020-08-01-00-51-15
.. nonce: dHKRVB
.. section: Library
Make an algebraic simplification to random.paretovariate().  It now is
slightly less subject to round-off error and is slightly faster. Inputs that
used to cause ZeroDivisionError now cause an OverflowError instead.
..
.. bpo: 41440
.. date: 2020-07-30-14-56-58
.. nonce: rju34k
.. section: Library
Add :func:`os.cpu_count` support for VxWorks RTOS.
..
.. bpo: 41316
.. date: 2020-07-28-12-08-58
.. nonce: bSCbK4
.. section: Library
Fix the :mod:`tarfile` module to write only basename of TAR file to GZIP
compression header.
..
.. bpo: 41384
.. date: 2020-07-26-21-18-43
.. nonce: MlzIgV
.. section: Library
Raise TclError instead of TypeError when an unknown option is passed to
tkinter.OptionMenu.
..
.. bpo: 41317
.. date: 2020-07-23-01-18-34
.. nonce: O17Z6x
.. section: Library
Use add_done_callback() in asyncio.loop.sock_accept() to unsubscribe reader
early on cancellation.
..
.. bpo: 41364
.. date: 2020-07-21-21-45-55
.. nonce: 5O-k7A
.. section: Library
Reduce import overhead of :mod:`uuid`.
..
.. bpo: 35328
.. date: 2020-07-21-16-20-55
.. nonce: jXovHb
.. section: Library
Set the environment variable ``VIRTUAL_ENV_PROMPT`` at :mod:`venv`
activation.
..
.. bpo: 41341
.. date: 2020-07-20-19-13-17
.. nonce: wqrj8C
.. section: Library
Recursive evaluation of ``typing.ForwardRef`` in ``get_type_hints``.
..
.. bpo: 41344
.. date: 2020-07-20-13-27-48
.. nonce: iKipNd
.. section: Library
Prevent creating :class:`shared_memory.SharedMemory` objects with
:code:`size=0`.
..
.. bpo: 41333
.. date: 2020-07-18-18-07-40
.. nonce: upkHIm
.. section: Library
:meth:`collections.OrderedDict.pop` is now 2 times faster.
..
.. bpo: 41288
.. date: 2020-07-13-15-06-35
.. nonce: 8mn5P-
.. section: Library
Unpickling invalid NEWOBJ_EX opcode with the C implementation raises now
UnpicklingError instead of crashing.
..
.. bpo: 39017
.. date: 2020-07-12-22-16-58
.. nonce: x3Cg-9
.. section: Library
Avoid infinite loop when reading specially crafted TAR files using the
tarfile module (:cve:`2019-20907`).
..
.. bpo: 41273
.. date: 2020-07-11-00-15-01
.. nonce: SVrsJh
.. section: Library
Speed up any transport using ``_ProactorReadPipeTransport`` by calling
``recv_into`` instead of ``recv``, thus not creating a new buffer for each
``recv`` call in the transport's read loop.
..
.. bpo: 41235
.. date: 2020-07-07-21-56-26
.. nonce: H2csMU
.. section: Library
Fix the error handling in :meth:`ssl.SSLContext.load_dh_params`.
..
.. bpo: 41207
.. date: 2020-07-06-16-58-53
.. nonce: Emw7Nk
.. section: Library
In distutils.spawn, restore expectation that DistutilsExecError is raised
when the command is not found.
..
.. bpo: 29727
.. date: 2020-07-05-19-16-02
.. nonce: Q6Z2rg
.. section: Library
Register :class:`array.array` as a
:class:`~collections.abc.MutableSequence`. Patch by Pablo Galindo.
..
.. bpo: 39168
.. date: 2020-07-04-21-56-46
.. nonce: DQWsXj
.. section: Library
Remove the ``__new__`` method of :class:`typing.Generic`.
..
.. bpo: 41194
.. date: 2020-07-03-13-15-08
.. nonce: djrKjs
.. section: Library
Fix a crash in the ``_ast`` module: it can no longer be loaded more than
once. It now uses a global state rather than a module state.
..
.. bpo: 41195
.. date: 2020-07-02-15-03-04
.. nonce: cEnpO3
.. section: Library
Add read-only ssl.SSLContext.security_level attribute to retrieve the
context's security level.
..
.. bpo: 41193
.. date: 2020-07-02-11-53-45
.. nonce: 8-Tnql
.. section: Library
The ``write_history()`` atexit function of the readline completer now
ignores any :exc:`OSError` to ignore error if the filesystem is read-only,
instead of only ignoring :exc:`FileNotFoundError` and
:exc:`PermissionError`.
..
.. bpo: 41182
.. date: 2020-07-01-17-33-50
.. nonce: FPFI0N
.. section: Library
selector: use DefaultSelector based upon implementation
..
.. bpo: 41161
.. date: 2020-06-30-20-50-51
.. nonce: QTdJjz
.. section: Library
The decimal module now requires libmpdec-2.5.0. Users of
--with-system-libmpdec should update their system library.
..
.. bpo: 40874
.. date: 2020-06-28-21-16-51
.. nonce: YImvzA
.. section: Library
The decimal module now requires libmpdec-2.5.0.
..
.. bpo: 41138
.. date: 2020-06-27-13-51-36
.. nonce: bIpf7g
.. section: Library
Fixed the :mod:`trace` module CLI for Python source files with non-UTF-8
encoding.
..
.. bpo: 31082
.. date: 2020-06-25-10-11-47
.. nonce: HsgDkx
.. section: Library
Use the term "iterable" in the docstring for :func:`functools.reduce`.
..
.. bpo: 40521
.. date: 2020-06-23-06-09-59
.. nonce: HUfxP7
.. section: Library
Remove freelist from collections.deque().
..
.. bpo: 31938
.. date: 2020-06-22-20-08-40
.. nonce: EVuko9
.. section: Library
Fix default-value signatures of several functions in the :mod:`select`
module - by Anthony Sottile.
..
.. bpo: 41068
.. date: 2020-06-22-10-25-39
.. nonce: _bX2BW
.. section: Library
Fixed reading files with non-ASCII names from ZIP archive directly after
writing them.
..
.. bpo: 41058
.. date: 2020-06-20-21-03-55
.. nonce: gztdZy
.. section: Library
:func:`pdb.find_function` now correctly determines the source file encoding.
..
.. bpo: 41056
.. date: 2020-06-20-18-37-29
.. nonce: d9v_uL
.. section: Library
Invalid file descriptor values are now prevented from being passed to
os.fpathconf. (discovered by Coverity)
..
.. bpo: 41056
.. date: 2020-06-20-18-35-43
.. nonce: Garcle
.. section: Library
Fix a NULL pointer dereference within the ssl module during a MemoryError in
the keylog callback. (discovered by Coverity)
..
.. bpo: 41056
.. date: 2020-06-20-18-33-03
.. nonce: gTH4Bq
.. section: Library
Fixed an instance where a MemoryError within the zoneinfo module might not
be reported or not reported at its source. (found by Coverity)
..
.. bpo: 41048
.. date: 2020-06-20-10-16-57
.. nonce: hEXB-B
.. section: Library
:func:`mimetypes.read_mime_types` function reads the rule file using UTF-8
encoding, not the locale encoding. Patch by Srinivas Reddy Thatiparthy.
..
.. bpo: 41043
.. date: 2020-06-20-00-19-30
.. nonce: p-Pk-H
.. section: Library
Fixed the use of :func:`~glob.glob` in the stdlib: literal part of the path
is now always correctly escaped.
..
.. bpo: 41025
.. date: 2020-06-18-10-34-59
.. nonce: elf_nz
.. section: Library
Fixed an issue preventing the C implementation of :class:`zoneinfo.ZoneInfo`
from being subclassed.
..
.. bpo: 35018
.. date: 2020-06-17-23-49-45
.. nonce: NP5_Qk
.. section: Library
Add the :class:`xml.sax.handler.LexicalHandler` class that is present in
other SAX XML implementations.
..
.. bpo: 41002
.. date: 2020-06-17-17-26-24
.. nonce: NPBItE
.. section: Library
Improve performance of HTTPResponse.read with a given amount. Patch by Bruce
Merry.
..
.. bpo: 40448
.. date: 2020-06-15-12-22-53
.. nonce: 1dk8Bu
.. section: Library
:mod:`ensurepip` now disables the use of ``pip`` cache when installing the
bundled versions of ``pip`` and ``setuptools``.  Patch by Krzysztof Konopko.
..
.. bpo: 40967
.. date: 2020-06-15-00-13-57
.. nonce: _dx3OO
.. section: Library
Removed :meth:`!asyncio.Task.current_task` and
:meth:`!asyncio.Task.all_tasks`. Patch contributed by Rémi Lapeyre.
..
.. bpo: 40924
.. date: 2020-06-13-12-04-50
.. nonce: SM_luS
.. section: Library
Ensure ``importlib.resources.path`` returns an extant path for the
SourceFileLoader's resource reader. Avoids the regression identified in
master while a long-term solution is devised.
..
.. bpo: 40955
.. date: 2020-06-12-11-55-30
.. nonce: huixCg
.. section: Library
Fix a minor memory leak in :mod:`subprocess` module when extra_groups was
specified.
..
.. bpo: 40855
.. date: 2020-06-12-10-44-15
.. nonce: jSot83
.. section: Library
The standard deviation and variance functions in the statistics module were
ignoring their mu and xbar arguments.
..
.. bpo: 40939
.. date: 2020-06-11-11-07-10
.. nonce: -D5Asl
.. section: Library
Use the new PEG parser when generating the stdlib :mod:`keyword` module.
..
.. bpo: 23427
.. date: 2020-06-08-18-59-16
.. nonce: ilg1Cz
.. section: Library
Add :data:`sys.orig_argv` attribute: the list of the original command line
arguments passed to the Python executable.
..
.. bpo: 33689
.. date: 2020-06-06-14-09-55
.. nonce: EFUDH7
.. section: Library
Ignore empty or whitespace-only lines in .pth files. This matches the
documentated behavior. Before, empty lines caused the site-packages dir to
appear multiple times in sys.path. By Ido Michael, contributors Malcolm
Smith and Tal Einat.
..
.. bpo: 40884
.. date: 2020-06-06-02-42-26
.. nonce: n7fOwS
.. section: Library
Added a ``defaults`` parameter to :class:`logging.Formatter`, to allow
specifying default values for custom fields. Patch by Asaf Alon and Bar
Harel.
..
.. bpo: 40876
.. date: 2020-06-05-20-00-18
.. nonce: zDhiZj
.. section: Library
Clarify error message in the :mod:`csv` module.
..
.. bpo: 39791
.. date: 2020-06-05-19-29-10
.. nonce: _CcO3d
.. section: Library
Refresh importlib.metadata from importlib_metadata 1.6.1.
..
.. bpo: 40807
.. date: 2020-06-04-16-25-15
.. nonce: yYyLWx
.. section: Library
Stop codeop._maybe_compile, used by code.InteractiveInterpreter (and IDLE).
from emitting each warning three times.
..
.. bpo: 32604
.. date: 2020-06-02-23-49-07
.. nonce: ZN4V4l
.. section: Library
Fix reference leak in the :mod:`select` module when the module is imported
in a subinterpreter.
..
.. bpo: 39791
.. date: 2020-06-02-02-16-02
.. nonce: StCJlA
.. section: Library
Built-in loaders (SourceFileLoader and ZipImporter) now supply
``TraversableResources`` implementations for ``ResourceReader``, and the
fallback function has been removed.
..
.. bpo: 39314
.. date: 2020-06-01-02-16-29
.. nonce: 0T9hlA
.. section: Library
:class:`rlcompleter.Completer` and the standard Python shell now close the
parenthesis for functions that take no arguments. Patch contributed by Rémi
Lapeyre.
..
.. bpo: 17005
.. date: 2020-05-31-23-32-36
.. nonce: JlRUGB
.. section: Library
The topological sort functionality that was introduced initially in the
:mod:`functools` module has been moved to a new :mod:`graphlib` module to
better accommodate the new tools and keep the original scope of the
:mod:`functools` module. Patch by Pablo Galindo
..
.. bpo: 40834
.. date: 2020-05-31-15-52-18
.. nonce: MO9_hb
.. section: Library
Fix truncate when sending str object with_xxsubinterpreters.channel_send.
..
.. bpo: 40755
.. date: 2020-05-30-18-48-58
.. nonce: IyOe2J
.. section: Library
Add rich comparisons to collections.Counter().
..
.. bpo: 26407
.. date: 2020-05-30-14-19-47
.. nonce: MjWLO1
.. section: Library
Unexpected errors in calling the ``__iter__`` method are no longer masked by
``TypeError`` in :func:`csv.reader`, :func:`csv.writer.writerow` and
:meth:`csv.writer.writerows`.
..
.. bpo: 39384
.. date: 2020-05-30-12-44-29
.. nonce: Iqxy3q
.. section: Library
Fixed email.contentmanager to allow set_content() to set a null string.
..
.. bpo: 40744
.. date: 2020-05-30-08-10-23
.. nonce: jKURVV
.. section: Library
The :mod:`sqlite3` module uses SQLite API functions that require SQLite
v3.7.3 or higher.  This patch removes support for older SQLite versions, and
explicitly requires SQLite 3.7.3 both at build, compile and runtime.  Patch
by Sergey Fedoseev and Erlend E. Aasland.
..
.. bpo: 40777
.. date: 2020-05-28-17-32-29
.. nonce: 1kJU6N
.. section: Library
Initialize PyDateTime_IsoCalendarDateType.tp_base at run-time to avoid
errors on some compilers.
..
.. bpo: 38488
.. date: 2020-05-28-16-51-00
.. nonce: hFQNgA
.. section: Library
Update ensurepip to install pip 20.1.1 and setuptools 47.1.0.
..
.. bpo: 40792
.. date: 2020-05-27-22-19-42
.. nonce: 87Yx01
.. section: Library
The result of :func:`operator.index` now always has exact type :class:`int`.
Previously, the result could have been an instance of a subclass of ``int``.
..
.. bpo: 40767
.. date: 2020-05-27-21-27-01
.. nonce: L5MnVV
.. section: Library
:mod:`webbrowser` now properly finds the default browser in pure Wayland
systems by checking the WAYLAND_DISPLAY environment variable. Patch
contributed by Jérémy Attali.
..
.. bpo: 40791
.. date: 2020-05-27-18-04-52
.. nonce: IzpNor
.. section: Library
:func:`hashlib.compare_digest` uses OpenSSL's ``CRYPTO_memcmp()`` function
when OpenSSL is available.
..
.. bpo: 40795
.. date: 2020-05-27-17-00-18
.. nonce: eZSnHA
.. section: Library
:mod:`ctypes` module: If ctypes fails to convert the result of a callback or
if a ctypes callback function raises an exception, sys.unraisablehook is now
called with an exception set. Previously, the error was logged into stderr
by :c:func:`PyErr_Print`.
..
.. bpo: 16995
.. date: 2020-05-27-00-09-52
.. nonce: 4niOT7
.. section: Library
Add :func:`base64.b32hexencode` and :func:`base64.b32hexdecode` to support
the Base32 Encoding with Extended Hex Alphabet.
..
.. bpo: 30008
.. date: 2020-05-25-22-18-38
.. nonce: CKC3td
.. section: Library
Fix :mod:`ssl` code to be compatible with OpenSSL 1.1.x builds that use
``no-deprecated`` and ``--api=1.1.0``.
..
.. bpo: 30064
.. date: 2020-05-25-11-52-23
.. nonce: 6CICsH
.. section: Library
Fix asyncio ``loop.sock_*`` race condition issue
..
.. bpo: 40759
.. date: 2020-05-24-23-52-35
.. nonce: DdZdaw
.. section: Library
Deprecate the :mod:`symbol` module.
..
.. bpo: 40756
.. date: 2020-05-24-11-06-37
.. nonce: 7ZH83z
.. section: Library
The second argument (extra) of ``LoggerAdapter.__init__`` now defaults to
None.
..
.. bpo: 37129
.. date: 2020-05-23-04-18-00
.. nonce: YoYoYo
.. section: Library
Add a new :const:`os.RWF_APPEND` flag for :func:`os.pwritev`.
..
.. bpo: 40737
.. date: 2020-05-23-00-22-11
.. nonce: iph-CM
.. section: Library
Fix possible reference leak for :mod:`sqlite3` initialization.
..
.. bpo: 40726
.. date: 2020-05-22-12-45-58
.. nonce: 7oBdMw
.. section: Library
Handle cases where the ``end_lineno`` is ``None`` on
:func:`ast.increment_lineno`.
..
.. bpo: 40698
.. date: 2020-05-20-14-38-04
.. nonce: zwl5Hc
.. section: Library
``distutils`` upload creates SHA2-256 and Blake2b-256 digests. MD5
digests is skipped if platform blocks MD5.
..
.. bpo: 40695
.. date: 2020-05-20-13-03-28
.. nonce: lr4aIS
.. section: Library
:mod:`hashlib` no longer falls back to builtin hash implementations when
OpenSSL provides a hash digest and the algorithm is blocked by security
policy.
..
.. bpo: 9216
.. date: 2020-05-20-12-53-20
.. nonce: ps7Yf1
.. section: Library
:func:`hashlib.new` passed ``usedforsecurity`` to OpenSSL EVP constructor
``_hashlib.new()``. test_hashlib and test_smtplib handle strict security
policy better.
..
.. bpo: 40614
.. date: 2020-05-18-22-41-02
.. nonce: 8j3kmq
.. section: Library
:func:`ast.parse` will not parse self documenting expressions in f-strings
when passed ``feature_version`` is less than ``(3, 8)``.
..
.. bpo: 40626
.. date: 2020-05-18-17-29-30
.. nonce: NeZufF
.. section: Library
Add h5 file extension as MIME Type application/x-hdf5, as per HDF Group
recommendation for HDF5 formatted data files. Patch contributed by Mark
Schwab.
..
.. bpo: 25920
.. date: 2020-05-18-15-38-25
.. nonce: PxrLY8
.. section: Library
On macOS, when building Python for macOS 10.4 and older, which wasn't the
case for python.org macOS installer, :func:`socket.getaddrinfo` no longer
uses an internal lock to prevent race conditions when calling
``getaddrinfo()`` which is thread-safe since macOS 10.5. Python 3.9 requires
macOS 10.6 or newer. The internal lock caused random hang on fork when
another thread was calling :func:`socket.getaddrinfo`. The lock was also
used on FreeBSD older than 5.3, OpenBSD older than 201311 and NetBSD older
than 4.
..
.. bpo: 40671
.. date: 2020-05-18-15-26-31
.. nonce: NeZ9Cy
.. section: Library
Prepare ``_hashlib`` for :pep:`489` and use :c:func:`PyModule_AddType`.
..
.. bpo: 32309
.. date: 2020-05-17-02-03-09
.. nonce: KM9psl
.. section: Library
Added a new :term:`coroutine` :func:`asyncio.to_thread`. It is mainly used
for running IO-bound functions in a separate thread to avoid blocking the
event loop, and essentially works as a high-level version of
:meth:`~asyncio.loop.run_in_executor` that can directly take keyword
arguments.
..
.. bpo: 36543
.. date: 2020-05-15-21-14-45
.. nonce: Jt-eSX
.. section: Library
Restored the deprecated :mod:`xml.etree.cElementTree` module.
..
.. bpo: 40611
.. date: 2020-05-13-16-28-33
.. nonce: ZCk0_c
.. section: Library
:const:`~mmap.MAP_POPULATE` constant has now been added to the list of
exported :mod:`mmap` module flags.
..
.. bpo: 39881
.. date: 2020-05-07-22-00-12
.. nonce: E1xsNv
.. section: Library
PEP 554 for use in the test suite. (Patch By Joannah Nanjekye)
..
.. bpo: 13097
.. date: 2020-05-06-02-01-25
.. nonce: Wh5xSK
.. section: Library
``ctypes`` now raises an ``ArgumentError`` when a callback is invoked with
more than 1024 arguments.
..
.. bpo: 39385
.. date: 2020-04-23-18-21-19
.. nonce: MIAyS7
.. section: Library
A new test assertion context-manager, :func:`unittest.assertNoLogs` will
ensure a given block of code emits no log messages using the logging module.
Contributed by Kit Yan Choi.
..
.. bpo: 23082
.. date: 2020-04-20-22-08-36
.. nonce: iX90Id
.. section: Library
Updated the error message and docs of PurePath.relative_to() to better
reflect the function behaviour.
..
.. bpo: 40318
.. date: 2020-04-18-14-16-02
.. nonce: K2UdRx
.. section: Library
Use SQLite3 trace v2 API, if it is available.
..
.. bpo: 40105
.. date: 2020-04-03-16-13-59
.. nonce: hfM2c0
.. section: Library
ZipFile truncates files to avoid corruption when a shorter comment is
provided in append ("a") mode. Patch by Jan Mazur.
..
.. bpo: 40084
.. date: 2020-03-29-21-32-00
.. nonce: MCYwcv
.. section: Library
Fix ``Enum.__dir__``: dir(Enum.member) now includes attributes as well as
methods.
..
.. bpo: 31122
.. date: 2020-03-11-07-44-06
.. nonce: zIQ80l
.. section: Library
ssl.wrap_socket() now raises ssl.SSLEOFError rather than OSError when peer
closes connection during TLS negotiation
..
.. bpo: 39728
.. date: 2020-02-24-10-58-34
.. nonce: kOOaHn
.. section: Library
fix default ``_missing_`` so a duplicate ``ValueError`` is not set as the
``__context__`` of the original ``ValueError``.
..
.. bpo: 39244
.. date: 2020-02-23-15-09-47
.. nonce: aBK5IM
.. section: Library
Fixed :class:`multiprocessing.context.get_all_start_methods` to properly
return the default method first on macOS.
..
.. bpo: 39040
.. date: 2019-12-15-18-47-20
.. nonce: tKa0Qs
.. section: Library
Fix parsing of invalid mime headers parameters by collapsing whitespace
between encoded words in a bare-quote-string.
..
.. bpo: 38731
.. date: 2019-11-13-07-37-11
.. nonce: 9qmcSx
.. section: Library
Add ``--quiet`` option to command-line interface of :mod:`py_compile`. Patch
by Gregory Schevchenko.
..
.. bpo: 35714
.. date: 2019-10-25-23-45-49
.. nonce: fw3xb7
.. section: Library
:exc:`struct.error` is now raised if there is a null character in a
:mod:`struct` format string.
..
.. bpo: 38144
.. date: 2019-09-12-21-34-03
.. nonce: 8uQCdd
.. section: Library
Added the *root_dir* and *dir_fd* parameters in :func:`glob.glob`.
..
.. bpo: 26543
.. date: 2019-08-11-16-28-03
.. nonce: X-TJZO
.. section: Library
Fix :meth:`IMAP4.noop` when debug mode is enabled (ex: ``imaplib.Debug =
3``).
..
.. bpo: 12178
.. date: 2019-05-31-23-54-28
.. nonce: N6FLCZ
.. section: Library
:func:`csv.writer` now correctly escapes *escapechar* when input contains
*escapechar*.  Patch by Catalin Iacob, Berker Peksag, and Itay Elbirt.
..
.. bpo: 36290
.. date: 2019-03-17-19-01-53
.. nonce: 7VXo_K
.. section: Library
AST nodes are now raising :exc:`TypeError` on conflicting keyword arguments.
Patch contributed by Rémi Lapeyre.
..
.. bpo: 33944
.. date: 2019-03-01-01-56-23
.. nonce: -82Pkt
.. section: Library
Added site.py site-packages tracing in verbose mode.
..
.. bpo: 35078
.. date: 2018-10-27-09-37-03
.. nonce: kweA3R
.. section: Library
Refactor formatweekday, formatmonthname methods in LocaleHTMLCalendar and
LocaleTextCalendar classes in calendar module to call the base class
methods.This enables customizable CSS classes for LocaleHTMLCalendar. Patch
by Srinivas Reddy Thatiparthy
..
.. bpo: 29620
.. date: 2018-08-21-16-20-33
.. nonce: xxx666
.. section: Library
:func:`~unittest.TestCase.assertWarns` no longer raises a
``RuntimeException`` when accessing a module's ``__warningregistry__``
causes importation of a new module, or when a new module is imported in
another thread. Patch by Kernc.
..
.. bpo: 31844
.. date: 2018-07-30-12-48-17
.. nonce: 0_GKsD
.. section: Library
Remove ``ParserBase.error()`` method from the private and undocumented
``_markupbase`` module.  :class:`html.parser.HTMLParser` is the only
subclass of ``ParserBase`` and its ``error()`` implementation was deprecated
in Python 3.4 and removed in Python 3.5.
..
.. bpo: 34226
.. date: 2018-07-29-12-14-54
.. nonce: BE7zbu
.. section: Library
Fix ``cgi.parse_multipart`` without content_length. Patch by Roger Duran
..
.. bpo: 33660
.. date: 2018-06-12-23-30-41
.. nonce: AdDn5Z
.. section: Library
Fix pathlib.PosixPath to resolve a relative path located on the root
directory properly.
..
.. bpo: 28557
.. date: 2018-06-07-22-04-01
.. nonce: ViNJnK
.. section: Library
Improve the error message for a misbehaving ``rawio.readinto``
..
.. bpo: 26680
.. date: 2018-03-15-11-56-48
.. nonce: Udkhn4
.. section: Library
The d.is_integer() method is added to the Decimal type, for compatibility
with other number types.
..
.. bpo: 26680
.. date: 2018-03-15-11-55-04
.. nonce: eKAi85
.. section: Library
The x.is_integer() method is incorporated into the abstract types of the
numeric tower, Real, Rational and Integral, with appropriate default
implementations.
..
.. bpo: 41428
.. date: 2020-10-03-18-20-46
.. nonce: _ju1NE
.. section: Documentation
Add documentation for :pep:`604` (Allow writing union types as ``X | Y``).
..
.. bpo: 41774
.. date: 2020-09-24-15-35-13
.. nonce: 5IqdGP
.. section: Documentation
In Programming FAQ "Sequences (Tuples/Lists)" section, add "How do you
remove multiple items from a list".
..
.. bpo: 35293
.. date: 2020-09-12-17-37-13
.. nonce: _cOwPD
.. section: Documentation
Fix RemovedInSphinx40Warning when building the documentation. Patch by
Donghee Na.
..
.. bpo: 37149
.. date: 2020-09-10-07-48-02
.. nonce: VD0rCv
.. section: Documentation
Change Shipman tkinter doc link from archive.org to TkDocs. (The doc has
been removed from the NMT server.)  The new link responds much faster and
includes a short explanatory note.
..
.. bpo: 41726
.. date: 2020-09-08-16-57-09
.. nonce: g0UXrn
.. section: Documentation
Update the refcounts info of ``PyType_FromModuleAndSpec``.
..
.. bpo: 41624
.. date: 2020-08-25-15-11-23
.. nonce: ddjJlN
.. section: Documentation
Fix the signature of :class:`typing.Coroutine`.
..
.. bpo: 40204
.. date: 2020-08-12-18-35-40
.. nonce: C8A_pe
.. section: Documentation
Enable Sphinx 3.2 ``c_allow_pre_v3`` option and disable
``c_warn_on_allowed_pre_v3`` option to make the documentation compatible
with Sphinx 2 and Sphinx 3.
..
.. bpo: 41045
.. date: 2020-07-27-20-46-17
.. nonce: GFF6Ul
.. section: Documentation
Add documentation for debug feature of f-strings.
..
.. bpo: 41314
.. date: 2020-07-25-14-20-00
.. nonce: yrjko0
.. section: Documentation
Changed the release when ``from __future__ import annotations`` becomes the
default from ``4.0`` to ``3.10`` (following a change in PEP 563).
..
.. bpo: 40979
.. date: 2020-07-21-15-23-30
.. nonce: pLA8rO
.. section: Documentation
Refactored typing.rst, arranging more than 70 classes, functions, and
decorators into new sub-sections.
..
.. bpo: 40552
.. date: 2020-05-09-12-10-31
.. nonce: _0uB73
.. section: Documentation
Fix in tutorial section 4.2. Code snippet is now correct.
..
.. bpo: 39883
.. date: 2020-03-07-03-53-39
.. nonce: 1tnb4-
.. section: Documentation
Make code, examples, and recipes in the Python documentation be licensed
under the more permissive BSD0 license in addition to the existing Python
2.0 license.
..
.. bpo: 37703
.. date: 2019-08-16-20-25-42
.. nonce: Qm_l_H
.. section: Documentation
Updated Documentation to comprehensively elaborate on the behaviour of
gather.cancel()
..
.. bpo: 41939
.. date: 2020-10-05-09-37-43
.. nonce: P4OlbA
.. section: Tests
Fix test_site.test_license_exists_at_url(): call
``urllib.request.urlcleanup()`` to reset the global
``urllib.request._opener``. Patch by Victor Stinner.
..
.. bpo: 41731
.. date: 2020-09-11-19-12-31
.. nonce: Ivxh4U
.. section: Tests
Make test_cmd_line_script pass with option '-vv'.
..
.. bpo: 41602
.. date: 2020-08-25-19-25-36
.. nonce: Z64s0I
.. section: Tests
Add tests for SIGINT handling in the runpy module.
..
.. bpo: 41521
.. date: 2020-08-11-14-59-13
.. nonce: w2UYK7
.. section: Tests
:mod:`test.support`: Rename ``blacklist`` parameter of
:func:`~test.support.check__all__` to ``not_exported``.
..
.. bpo: 41477
.. date: 2020-08-07-17-28-49
.. nonce: GrFexU
.. section: Tests
Make ctypes optional in test_genericalias.
..
.. bpo: 41085
.. date: 2020-06-23-12-02-45
.. nonce: JZKsyz
.. section: Tests
Fix integer overflow in the :meth:`array.array.index` method on 64-bit
Windows for index larger than ``2**31``.
..
.. bpo: 41069
.. date: 2020-06-22-00-21-12
.. nonce: bLZkX-
.. section: Tests
:data:`test.support.TESTFN` and the current directory for tests when run via
``test.regrtest`` contain now non-ascii characters if possible.
..
.. bpo: 38377
.. date: 2020-06-17-18-00-21
.. nonce: jfg4TH
.. section: Tests
On Linux, skip tests using multiprocessing if the current user cannot create
a file in ``/dev/shm/`` directory. Add the
:func:`~test.support.skip_if_broken_multiprocessing_synchronize` function to
the :mod:`test.support` module.
..
.. bpo: 41009
.. date: 2020-06-17-17-27-07
.. nonce: Rvn6OQ
.. section: Tests
Fix use of ``support.require_{linux|mac|freebsd}_version()`` decorators as
class decorator.
..
.. bpo: 41003
.. date: 2020-06-17-15-07-14
.. nonce: tiH_Fy
.. section: Tests
Fix ``test_copyreg`` when ``numpy`` is installed: ``test.pickletester`` now
saves/restores warnings filters when importing ``numpy``, to ignore filters
installed by ``numpy``.
..
.. bpo: 40964
.. date: 2020-06-12-20-46-23
.. nonce: OBzf2c
.. section: Tests
Disable remote :mod:`imaplib` tests, host cyrus.andrew.cmu.edu is blocking
incoming connections.
..
.. bpo: 40927
.. date: 2020-06-09-18-48-18
.. nonce: 67ylLg
.. section: Tests
Fix test_binhex when run twice: it now uses import_fresh_module() to ensure
that it raises DeprecationWarning each time.
..
.. bpo: 17258
.. date: 2020-05-26-07-53-31
.. nonce: X_IKTQ
.. section: Tests
Skip some :mod:`multiprocessing` tests when MD5 hash digest is blocked.
..
.. bpo: 31904
.. date: 2020-04-09-15-40-03
.. nonce: TJ4k3d
.. section: Tests
Increase LOOPBACK_TIMEOUT to 10 for VxWorks RTOS.
..
.. bpo: 38169
.. date: 2019-09-14-13-20-27
.. nonce: hurq4B
.. section: Tests
Increase code coverage for SharedMemory and ShareableList
..
.. bpo: 34401
.. date: 2018-08-20-09-38-52
.. nonce: eGxMPm
.. section: Tests
Make test_gdb properly run on HP-UX. Patch by Michael Osipov.
..
.. bpo: 38249
.. date: 2020-09-28-21-56-51
.. nonce: uzMCaZ
.. section: Build
Update :c:macro:`Py_UNREACHABLE` to use __builtin_unreachable() if only the
compiler is able to use it. Patch by Donghee Na.
..
.. bpo: 41617
.. date: 2020-08-24-18-34-01
.. nonce: sKKXz7
.. section: Build
Fix ``pycore_bitutils.h`` header file to support old clang versions:
``__builtin_bswap16()`` is not available in LLVM clang 3.0.
..
.. bpo: 40204
.. date: 2020-06-25-06-59-13
.. nonce: GpD04D
.. section: Build
Pin Sphinx version to 2.3.1 in ``Doc/Makefile``.
..
.. bpo: 36020
.. date: 2020-06-15-22-14-25
.. nonce: wbiv0P
.. section: Build
The C99 functions :c:func:`snprintf` and :c:func:`vsnprintf` are now
required to build Python.
..
.. bpo: 40684
.. date: 2020-06-08-19-57-05
.. nonce: WIY2-i
.. section: Build
``make install`` now uses the ``PLATLIBDIR`` variable for the destination
``lib-dynload/`` directory when ``./configure --with-platlibdir`` is used.
..
.. bpo: 40683
.. date: 2020-05-19-10-54-08
.. nonce: W8JHrr
.. section: Build
Fixed an issue where the :mod:`zoneinfo` module and its tests were not
included when Python is installed with ``make``.
..
.. bpo: 41744
.. date: 2020-09-11-17-59-33
.. nonce: e_ugDQ
.. section: Windows
Fixes automatic import of props file when using the Nuget package.
..
.. bpo: 41627
.. date: 2020-09-04-21-35-28
.. nonce: sx2KN1
.. section: Windows
The user site directory for 32-bit now includes a ``-32`` suffix to
distinguish it from the 64-bit interpreter's directory.
..
.. bpo: 41526
.. date: 2020-08-13-22-40-58
.. nonce: -i2bwb
.. section: Windows
Fixed layout of final page of the installer by removing the special thanks
to Mark Hammond (with his permission).
..
.. bpo: 41492
.. date: 2020-08-06-16-59-10
.. nonce: 2FQ9cM
.. section: Windows
Fixes the description that appears in UAC prompts.
..
.. bpo: 40948
.. date: 2020-07-28-12-39-32
.. nonce: ISUFO6
.. section: Windows
Improve post-install message to direct people to the "py" command.
..
.. bpo: 41412
.. date: 2020-07-28-11-55-43
.. nonce: ME20KB
.. section: Windows
The installer will now fail to install on Windows 7 and Windows 8. Further,
the UCRT dependency is now always downloaded on demand.
..
.. bpo: 40741
.. date: 2020-07-20-23-26-26
.. nonce: C9sc_d
.. section: Windows
Update Windows release to include SQLite 3.32.3.
..
.. bpo: 41142
.. date: 2020-06-28-12-40-41
.. nonce: jpZzzh
.. section: Windows
:mod:`!msilib` now supports creating CAB files with non-ASCII file path and
adding files with non-ASCII file path to them.
..
.. bpo: 41074
.. date: 2020-06-24-21-30-42
.. nonce: gaQc3C
.. section: Windows
Fixed support of non-ASCII names in functions :func:`!msilib.OpenDatabase`
and :func:`!msilib.init_database` and non-ASCII SQL in method
:meth:`!msilib.Database.OpenView`.
..
.. bpo: 41039
.. date: 2020-06-23-03-12-57
.. nonce: 0hgd0s
.. section: Windows
Stable ABI redirection DLL (python3.dll) now uses ``#pragma
comment(linker)`` for re-exporting.
..
.. bpo: 40164
.. date: 2020-06-12-13-13-44
.. nonce: SPrSn5
.. section: Windows
Updates Windows OpenSSL to 1.1.1g
..
.. bpo: 39631
.. date: 2020-05-19-14-43-33
.. nonce: Z5yXam
.. section: Windows
Changes the registered MIME type for ``.py`` files on Windows to
``text/x-python`` instead of ``text/plain``.
..
.. bpo: 40677
.. date: 2020-05-19-04-11-12
.. nonce: qQbLW8
.. section: Windows
Manually define IO_REPARSE_TAG_APPEXECLINK in case some old Windows SDK
doesn't have it.
..
.. bpo: 37556
.. date: 2019-07-11-06-11-09
.. nonce: sygMUU
.. section: Windows
Extend py.exe help to mention overrides via venv, shebang, environmental
variables & ini files.
..
.. bpo: 41557
.. date: 2020-08-26-09-31-37
.. nonce: mcQ75z
.. section: macOS
Update macOS installer to use SQLite 3.33.0.
..
.. bpo: 39580
.. date: 2020-06-25-06-09-00
.. nonce: N_vJ9h
.. section: macOS
Avoid opening Finder window if running installer from the command line.
Patch contributed by Rick Heil.
..
.. bpo: 41100
.. date: 2020-06-24-13-51-57
.. nonce: mcHdc5
.. section: macOS
Fix configure error when building on macOS 11. Note that the current Python
release was released shortly after the first developer preview of macOS 11
(Big Sur); there are other known issues with building and running on the
developer preview. Big Sur is expected to be fully supported in a future
bugfix release of Python 3.8.x and with 3.9.0.
..
.. bpo: 40741
.. date: 2020-06-19-14-19-08
.. nonce: L7yTbm
.. section: macOS
Update macOS installer to use SQLite 3.32.3.
..
.. bpo: 41005
.. date: 2020-06-17-13-45-15
.. nonce: zZegdV
.. section: macOS
fixed an XDG settings issue not allowing macos to open browser in
webbrowser.py
..
.. bpo: 40741
.. date: 2020-06-07-20-10-56
.. nonce: 80A2BW
.. section: macOS
Update macOS installer to use SQLite 3.32.2.
..
.. bpo: 41775
.. date: 2020-09-24-14-31-16
.. nonce: sB8Vre
.. section: IDLE
Use 'IDLE Shell' as shell title
..
.. bpo: 35764
.. date: 2020-09-22-11-13-45
.. nonce: VoNa8y
.. section: IDLE
Rewrite the Calltips doc section.
..
.. bpo: 40181
.. date: 2020-09-22-00-45-40
.. nonce: hhQi3z
.. section: IDLE
In calltips, stop reminding that '/' marks the end of positional-only
arguments.
..
.. bpo: 41468
.. date: 2020-08-09-13-42-55
.. nonce: zkP0_Y
.. section: IDLE
Improve IDLE run crash error message (which users should never see).
..
.. bpo: 41373
.. date: 2020-07-24-17-49-58
.. nonce: YQIPu_
.. section: IDLE
Save files loaded with no line ending, as when blank, or different line
endings, by setting its line ending to the system default. Fix regression in
3.8.4 and 3.9.0b4.
..
.. bpo: 41300
.. date: 2020-07-16-17-39-06
.. nonce: wRixNb
.. section: IDLE
Save files with non-ascii chars. Fix regression released in 3.9.0b4 and
3.8.4.
..
.. bpo: 37765
.. date: 2020-07-07-18-44-30
.. nonce: umc1o8
.. section: IDLE
Add keywords to module name completion list.  Rewrite Completions section of
IDLE doc.
..
.. bpo: 41152
.. date: 2020-06-29-14-51-15
.. nonce: d6mV0C
.. section: IDLE
The encoding of ``stdin``, ``stdout`` and ``stderr`` in IDLE is now always
UTF-8.
..
.. bpo: 41144
.. date: 2020-06-27-17-02-00
.. nonce: JoFGIX
.. section: IDLE
Make Open Module open a special module such as os.path.
..
.. bpo: 39885
.. date: 2020-05-29-18-21-58
.. nonce: zB_-bN
.. section: IDLE
Make context menu Cut and Copy work again when right-clicking within a
selection.
..
.. bpo: 40723
.. date: 2020-05-24-06-19-43
.. nonce: AJLd4U
.. section: IDLE
Make test_idle pass when run after import.
..
.. bpo: 41936
.. date: 2020-10-05-01-25-23
.. nonce: 1gb5ra
.. section: C API
Removed undocumented macros ``Py_ALLOW_RECURSION`` and
``Py_END_ALLOW_RECURSION`` and the ``recursion_critical`` field of the
:c:type:`PyInterpreterState` structure.
..
.. bpo: 41692
.. date: 2020-10-02-00-57-34
.. nonce: fDScsF
.. section: C API
The ``PyUnicode_InternImmortal()`` function is now deprecated and will be
removed in Python 3.12: use :c:func:`PyUnicode_InternInPlace` instead. Patch
by Victor Stinner.
..
.. bpo: 41842
.. date: 2020-09-27-20-43-16
.. nonce: bCakAj
.. section: C API
Add :c:func:`PyCodec_Unregister` function to unregister a codec search
function.
..
.. bpo: 41834
.. date: 2020-09-22-14-47-12
.. nonce: nrOrDU
.. section: C API
Remove the ``_Py_CheckRecursionLimit`` variable: it has been replaced by
``ceval.recursion_limit`` of the :c:type:`PyInterpreterState` structure.
Patch by Victor Stinner.
..
.. bpo: 41689
.. date: 2020-09-01-23-39-45
.. nonce: zxHbLB
.. section: C API
Types created with :c:func:`PyType_FromSpec` now make any signature in their
``tp_doc`` slot accessible from ``__text_signature__``.
..
.. bpo: 41524
.. date: 2020-08-12-17-09-06
.. nonce: u6Xfr2
.. section: C API
Fix bug in :c:func:`PyOS_mystrnicmp` and :c:func:`PyOS_mystricmp` that
incremented pointers beyond the end of a string.
..
.. bpo: 41324
.. date: 2020-08-10-16-05-08
.. nonce: waZD35
.. section: C API
Add a minimal decimal capsule API.  The API supports fast conversions
between Decimals up to 38 digits and their triple representation as a C
struct.
..
.. bpo: 30155
.. date: 2020-07-26-19-39-45
.. nonce: rHZRJ_
.. section: C API
Add :c:func:`PyDateTime_DATE_GET_TZINFO` and
:c:func:`PyDateTime_TIME_GET_TZINFO` macros for accessing the ``tzinfo``
attributes of :class:`datetime.datetime` and :class:`datetime.time` objects.
..
.. bpo: 40170
.. date: 2020-07-08-10-14-52
.. nonce: N6Qx1i
.. section: C API
Revert :c:func:`PyType_HasFeature` change: it reads again directly the
:c:member:`PyTypeObject.tp_flags` member when the limited C API is not used,
rather than always calling :c:func:`PyType_GetFlags` which hides
implementation details.
..
.. bpo: 41123
.. date: 2020-06-29-15-49-36
.. nonce: wYY4E1
.. section: C API
Remove ``PyUnicode_AsUnicodeCopy``.
..
.. bpo: 41123
.. date: 2020-06-29-11-33-49
.. nonce: qFevek
.. section: C API
Removed ``PyLong_FromUnicode()``.
..
.. bpo: 41123
.. date: 2020-06-28-11-39-22
.. nonce: sjJWjQ
.. section: C API
Removed ``PyUnicode_GetMax()``.
..
.. bpo: 41123
.. date: 2020-06-26-13-29-25
.. nonce: bRa1oy
.. section: C API
Removed ``Py_UNICODE_str*`` functions manipulating ``Py_UNICODE*`` strings.
..
.. bpo: 41103
.. date: 2020-06-24-22-57-07
.. nonce: doojgE
.. section: C API
``PyObject_AsCharBuffer()``, ``PyObject_AsReadBuffer()``,
``PyObject_CheckReadBuffer()``, and ``PyObject_AsWriteBuffer()`` are
removed. Please migrate to new buffer protocol; :c:func:`PyObject_GetBuffer`
and :c:func:`PyBuffer_Release`.
..
.. bpo: 36346
.. date: 2020-06-17-20-31-12
.. nonce: mwIyxi
.. section: C API
Raises DeprecationWarning for ``PyUnicode_FromUnicode(NULL, size)`` and
``PyUnicode_FromStringAndSize(NULL, size)`` with ``size > 0``.
..
.. bpo: 36346
.. date: 2020-06-17-11-24-00
.. nonce: fTMr3S
.. section: C API
Mark ``Py_UNICODE_COPY``, ``Py_UNICODE_FILL``, ``PyUnicode_WSTR_LENGTH``,
``PyUnicode_FromUnicode``, ``PyUnicode_AsUnicode``, and
``PyUnicode_AsUnicodeAndSize`` as deprecated in C. Remove
``Py_UNICODE_MATCH`` which was deprecated and broken since Python 3.3.
..
.. bpo: 40989
.. date: 2020-06-15-23-17-51
.. nonce: tlzG3r
.. section: C API
The :c:func:`PyObject_INIT` and :c:func:`PyObject_INIT_VAR` macros become
aliases to, respectively, :c:func:`PyObject_Init` and
:c:func:`PyObject_InitVar` functions.
..
.. bpo: 36020
.. date: 2020-06-15-16-46-01
.. nonce: djI6jw
.. section: C API
On Windows, ``#include "pyerrors.h"`` no longer defines ``snprintf`` and
``vsnprintf`` macros.
..
.. bpo: 40943
.. date: 2020-06-10-18-37-26
.. nonce: i4q7rK
.. section: C API
The ``PY_SSIZE_T_CLEAN`` macro must now be defined to use
:c:func:`PyArg_ParseTuple` and :c:func:`Py_BuildValue` formats which use
``#``: ``es#``, ``et#``, ``s#``, ``u#``, ``y#``, ``z#``, ``U#`` and ``Z#``.
See :ref:`Parsing arguments and building values <arg-parsing>` and the
:pep:`353`.
..
.. bpo: 40910
.. date: 2020-06-08-15-59-06
.. nonce: L56oI0
.. section: C API
Export explicitly the :c:func:`Py_GetArgcArgv` function to the C API and
document the function. Previously, it was exported implicitly which no
longer works since Python is built with ``-fvisibility=hidden``.
..
.. bpo: 40724
.. date: 2020-06-04-08-01-23
.. nonce: qIIdSi
.. section: C API
Allow defining buffer slots in type specs.
..
.. bpo: 40679
.. date: 2020-06-03-17-48-13
.. nonce: 3sgWma
.. section: C API
Fix a ``_PyEval_EvalCode()`` crash if *qualname* argument is NULL.
..
.. bpo: 40839
.. date: 2020-06-01-20-47-49
.. nonce: bAi52Z
.. section: C API
Calling :c:func:`PyDict_GetItem` without :term:`GIL` held had been allowed
for historical reason. It is no longer allowed.
..
.. bpo: 40826
.. date: 2020-06-01-16-12-37
.. nonce: zQzFoK
.. section: C API
:c:func:`PyOS_InterruptOccurred` now fails with a fatal error if it is
called with the GIL released.
..
.. bpo: 40792
.. date: 2020-05-27-11-02-15
.. nonce: pBw2Bb
.. section: C API
The result of :c:func:`PyNumber_Index` now always has exact type
:class:`int`. Previously, the result could have been an instance of a
subclass of ``int``.
..
.. bpo: 39573
.. date: 2020-05-26-16-21-47
.. nonce: depAgq
.. section: C API
Convert :c:func:`Py_REFCNT` and :c:func:`Py_SIZE` macros to static inline
functions. They cannot be used as l-value anymore: use
:c:func:`Py_SET_REFCNT` and :c:func:`Py_SET_SIZE` to set an object reference
count and size. This change is backward incompatible on purpose, to prepare
the C API for an opaque :c:type:`PyObject` structure.
..
.. bpo: 40703
.. date: 2020-05-20-19-11-12
.. nonce: qQXfW8
.. section: C API
The PyType_FromSpec*() functions no longer overwrite the type's "__module__"
attribute if it is set via "Py_tp_members" or "Py_tp_getset".
..
.. bpo: 39583
.. date: 2020-02-08-08-01-35
.. nonce: qURKSl
.. section: C API
Remove superfluous "extern C" declarations from ``Include/cpython/*.h``.

.. bpo: 24667
.. date: 9288
.. nonce: tdwszf
.. release date: 2015-08-09
.. section: Core and Builtins
Resize odict in all cases that the underlying dict resizes.
..
.. bpo: 24824
.. date: 9287
.. nonce: Eoc4lq
.. section: Library
Signatures of codecs.encode() and codecs.decode() now are compatible with
pydoc.
..
.. bpo: 24634
.. date: 9286
.. nonce: 7bnVgr
.. section: Library
Importing uuid should not try to load libc on Windows
..
.. bpo: 24798
.. date: 9285
.. nonce: zDXL5R
.. section: Library
_msvccompiler.py doesn't properly support manifests
..
.. bpo: 4395
.. date: 9284
.. nonce: JpT0k7
.. section: Library
Better testing and documentation of binary operators. Patch by Martin
Panter.
..
.. bpo: 23973
.. date: 9283
.. nonce: wT59Vh
.. section: Library
Update typing.py from GitHub repo.
..
.. bpo: 23004
.. date: 9282
.. nonce: xswcPm
.. section: Library
mock_open() now reads binary data correctly when the type of read_data is
bytes.  Initial patch by Aaron Hill.
..
.. bpo: 23888
.. date: 9281
.. nonce: 7gw4oO
.. section: Library
Handle fractional time in cookie expiry. Patch by ssh.
..
.. bpo: 23652
.. date: 9280
.. nonce: DKQ_7t
.. section: Library
Make it possible to compile the select module against the libc headers from
the Linux Standard Base, which do not include some EPOLL macros.  Patch by
Matt Frank.
..
.. bpo: 22932
.. date: 9279
.. nonce: mPclSJ
.. section: Library
Fix timezones in email.utils.formatdate. Patch from Dmitry Shachnev.
..
.. bpo: 23779
.. date: 9278
.. nonce: ET4JJP
.. section: Library
imaplib raises TypeError if authenticator tries to abort. Patch from Craig
Holmquist.
..
.. bpo: 23319
.. date: 9277
.. nonce: FXyUH-
.. section: Library
Fix ctypes.BigEndianStructure, swap correctly bytes. Patch written by
Matthieu Gautier.
..
.. bpo: 23254
.. date: 9276
.. nonce: zNiy1X
.. section: Library
Document how to close the TCPServer listening socket. Patch from Martin
Panter.
..
.. bpo: 19450
.. date: 9275
.. nonce: VG7T-L
.. section: Library
Update Windows and OS X installer builds to use SQLite 3.8.11.
..
.. bpo: 17527
.. date: 9274
.. nonce: ve9fyw
.. section: Library
Add PATCH to wsgiref.validator. Patch from Luca Sbardella.
..
.. bpo: 24791
.. date: 9273
.. nonce: Ok-3nA
.. section: Library
Fix grammar regression for call syntax: 'g(\*a or b)'.
..
.. bpo: 23672
.. date: 9272
.. nonce: 8td2se
.. section: IDLE
Allow Idle to edit and run files with astral chars in name. Patch by Mohd
Sanad Zaki Rizvi.
..
.. bpo: 24745
.. date: 9271
.. nonce: edbziT
.. section: IDLE
Idle editor default font. Switch from Courier to platform-sensitive
TkFixedFont.  This should not affect current customized font selections.  If
there is a problem, edit $HOME/.idlerc/config-main.cfg and remove ':samp:`font{xxx}`'
entries from [Editor Window].  Patch by Mark Roseman.
..
.. bpo: 21192
.. date: 9270
.. nonce: CdbipH
.. section: IDLE
Idle editor. When a file is run, put its name in the restart bar. Do not
print false prompts. Original patch by Adnan Umer.
..
.. bpo: 13884
.. date: 9269
.. nonce: vVcO1E
.. section: IDLE
Idle menus. Remove tearoff lines. Patch by Roger Serwy.
..
.. bpo: 24129
.. date: 9268
.. nonce: Imr54z
.. section: Documentation
Clarify the reference documentation for name resolution. This includes
removing the assumption that readers will be familiar with the name
resolution scheme Python used prior to the introduction of lexical scoping
for function namespaces. Patch by Ivan Levkivskyi.
..
.. bpo: 20769
.. date: 9267
.. nonce: ZUc9z9
.. section: Documentation
Improve reload() docs. Patch by Dorian Pula.
..
.. bpo: 23589
.. date: 9266
.. nonce: rjU421
.. section: Documentation
Remove duplicate sentence from the FAQ.  Patch by Yongzhi Pan.
..
.. bpo: 24729
.. date: 9265
.. nonce: PH3A9p
.. section: Documentation
Correct IO tutorial to match implementation regarding encoding parameter to
open function.
..
.. bpo: 24751
.. date: 9264
.. nonce: pL2pbj
.. section: Tests
When running regrtest with the ``-w`` command line option, a test run is no
longer marked as a failure if all tests succeed when re-run.

.. bpo: 29781
.. date: 2017-09-05-15-26-30
.. nonce: LwYtBP
.. release date: 2017-09-18
.. section: Security
SSLObject.version() now correctly returns None when handshake over BIO has
not been performed yet.
..
.. bpo: 30947
.. date: 2017-08-16-16-35-59
.. nonce: iNMmm4
.. section: Security
Upgrade libexpat embedded copy from version 2.2.1 to 2.2.3 to get security
fixes.
..
.. bpo: 31471
.. date: 2017-09-14-19-47-57
.. nonce: 0yiA5Q
.. section: Core and Builtins
Fix an assertion failure in ``subprocess.Popen()`` on Windows, in case the env
argument has a bad ``keys()`` method. Patch by Oren Milman.
..
.. bpo: 31418
.. date: 2017-09-13-13-03-52
.. nonce: rS-FlC
.. section: Core and Builtins
Fix an assertion failure in ``PyErr_WriteUnraisable()`` in case of an
exception with a bad ``__module__`` attribute. Patch by Oren Milman.
..
.. bpo: 31416
.. date: 2017-09-11-12-54-35
.. nonce: 2hlQFd
.. section: Core and Builtins
Fix assertion failures in case of a bad warnings.filters or
warnings.defaultaction. Patch by Oren Milman.
..
.. bpo: 31411
.. date: 2017-09-11-08-50-41
.. nonce: HZz82I
.. section: Core and Builtins
Raise a TypeError instead of SystemError in case warnings.onceregistry is
not a dictionary. Patch by Oren Milman.
..
.. bpo: 31373
.. date: 2017-09-06-15-25-59
.. nonce: dC4jd4
.. section: Core and Builtins
Fix several possible instances of undefined behavior due to floating-point
demotions.
..
.. bpo: 30465
.. date: 2017-09-06-10-47-29
.. nonce: oe-3GD
.. section: Core and Builtins
Location information (``lineno`` and ``col_offset``) in f-strings is now
(mostly) correct.  This fixes tools like flake8 from showing warnings on the
wrong line (typically the first line of the file).
..
.. bpo: 31343
.. date: 2017-09-04-14-57-27
.. nonce: Kl_fS5
.. section: Core and Builtins
Include sys/sysmacros.h for major(), minor(), and makedev(). GNU C library
plans to remove the functions from sys/types.h.
..
.. bpo: 31291
.. date: 2017-08-28-11-51-29
.. nonce: t8QggK
.. section: Core and Builtins
Fix an assertion failure in ``zipimport.zipimporter.get_data`` on Windows,
when the return value of ``pathname.replace('/','\\')`` isn't a string.
Patch by Oren Milman.
..
.. bpo: 31271
.. date: 2017-08-25-20-43-22
.. nonce: YMduKF
.. section: Core and Builtins
Fix an assertion failure in the ``write()`` method of ``io.TextIOWrapper``, when
the encoder doesn't return a bytes object. Patch by Oren Milman.
..
.. bpo: 31243
.. date: 2017-08-24-13-34-49
.. nonce: dRJzqR
.. section: Core and Builtins
Fix a crash in some methods of ``io.TextIOWrapper``, when the decoder's state
is invalid. Patch by Oren Milman.
..
.. bpo: 30721
.. date: 2017-08-18-15-15-20
.. nonce: Hmc56z
.. section: Core and Builtins
``print`` now shows correct usage hint for using Python 2 redirection
syntax.  Patch by Sanyam Khurana.
..
.. bpo: 31070
.. date: 2017-08-09-09-40-54
.. nonce: oDyLiI
.. section: Core and Builtins
Fix a race condition in importlib _get_module_lock().
..
.. bpo: 31095
.. date: 2017-08-01-18-48-30
.. nonce: bXWZDb
.. section: Core and Builtins
Fix potential crash during GC caused by ``tp_dealloc`` which doesn't call
``PyObject_GC_UnTrack()``.
..
.. bpo: 31071
.. date: 2017-07-31-13-28-53
.. nonce: P9UBDy
.. section: Core and Builtins
Avoid masking original TypeError in call with * unpacking when other
arguments are passed.
..
.. bpo: 30978
.. date: 2017-07-21-07-39-05
.. nonce: f0jODc
.. section: Core and Builtins
str.format_map() now passes key lookup exceptions through. Previously any
exception was replaced with a KeyError exception.
..
.. bpo: 30808
.. date: 2017-07-17-12-12-59
.. nonce: bA3zOv
.. section: Core and Builtins
Use _Py_atomic API for concurrency-sensitive signal state.
..
.. bpo: 30876
.. date: 2017-07-11-06-31-32
.. nonce: x35jZX
.. section: Core and Builtins
Relative import from unloaded package now reimports the package instead of
failing with SystemError.  Relative import from non-package now fails with
ImportError rather than SystemError.
..
.. bpo: 30703
.. date: 2017-06-28-21-07-32
.. nonce: ULCdFp
.. section: Core and Builtins
Improve signal delivery.
Avoid using Py_AddPendingCall from signal handler, to avoid calling
signal-unsafe functions. The tests I'm adding here fail without the rest of
the patch, on Linux and OS X. This means our signal delivery logic had
defects (some signals could be lost).
..
.. bpo: 30765
.. date: 2017-06-26-14-29-50
.. nonce: Q5iBmf
.. section: Core and Builtins
Avoid blocking in pthread_mutex_lock() when PyThread_acquire_lock() is asked
not to block.
..
.. bpo: 31161
.. date: 06
.. nonce: FcUAA0
.. section: Core and Builtins
Make sure the 'Missing parentheses' syntax error message is only applied to
SyntaxError, not to subclasses. Patch by Martijn Pieters.
..
.. bpo: 30814
.. date: 05
.. nonce: HcYsfM
.. section: Core and Builtins
Fixed a race condition when import a submodule from a package.
..
.. bpo: 30597
.. date: 04
.. nonce: 7erHiP
.. section: Core and Builtins
``print`` now shows expected input in custom error message when used as a
Python 2 statement. Patch by Sanyam Khurana.
..
.. bpo: 31499
.. date: 2017-09-18-10-57-04
.. nonce: BydYhf
.. section: Library
xml.etree: Fix a crash when a parser is part of a reference cycle.
..
.. bpo: 28556
.. date: 2017-09-14-11-02-56
.. nonce: EUOiYs
.. section: Library
typing.get_type_hints now finds the right globalns for classes and modules
by default (when no ``globalns`` was specified by the caller).
..
.. bpo: 28556
.. date: 2017-09-13-23-27-39
.. nonce: UmTQvv
.. section: Library
Speed improvements to the ``typing`` module.  Original PRs by Ivan
Levkivskyi and Mitar.
..
.. bpo: 31544
.. date: 2017-09-13-19-55-35
.. nonce: beTh6t
.. section: Library
The C accelerator module of ElementTree ignored exceptions raised when
looking up TreeBuilder target methods in XMLParser().
..
.. bpo: 31234
.. date: 2017-09-13-18-05-56
.. nonce: lGkcPg
.. section: Library
socket.create_connection() now fixes manually a reference cycle: clear the
variable storing the last exception on success.
..
.. bpo: 31457
.. date: 2017-09-13-13-33-39
.. nonce: bIVBtI
.. section: Library
LoggerAdapter objects can now be nested.
..
.. bpo: 31400
.. date: 2017-09-08-14-19-57
.. nonce: YOTPKi
.. section: Library
Improves SSL error handling to avoid losing error numbers.
..
.. bpo: 28958
.. date: 2017-09-06-19-41-01
.. nonce: x4-K5F
.. section: Library
ssl.SSLContext() now uses OpenSSL error information when a context cannot be
instantiated.
..
.. bpo: 27340
.. date: 2017-09-06-06-50-41
.. nonce: GgekV5
.. section: Library
SSLSocket.sendall() now uses memoryview to create slices of data. This fixes
support for all bytes-like object. It is also more efficient and avoids
costly copies.
..
.. bpo: 31178
.. date: 2017-09-05-14-55-28
.. nonce: JrSFo7
.. section: Library
Fix string concatenation bug in rare error path in the subprocess module
..
.. bpo: 31350
.. date: 2017-09-05-10-30-48
.. nonce: dXJ-7N
.. section: Library
Micro-optimize :func:`asyncio._get_running_loop` to become up to 10% faster.
..
.. bpo: 31170
.. date: 2017-09-04-23-41-35
.. nonce: QGmJ1t
.. section: Library
expat: Update libexpat from 2.2.3 to 2.2.4. Fix copying of partial
characters for UTF-8 input (libexpat bug 115):
https://github.com/libexpat/libexpat/issues/115
..
.. bpo: 29136
.. date: 2017-09-04-16-39-49
.. nonce: vSn1oR
.. section: Library
Add TLS 1.3 cipher suites and OP_NO_TLSv1_3.
..
.. bpo: 29212
.. date: 2017-09-03-14-31-00
.. nonce: bicycl
.. section: Library
Fix concurrent.futures.thread.ThreadPoolExecutor threads to have a non
repr() based thread name by default when no thread_name_prefix is supplied.
They will now identify themselves as "ThreadPoolExecutor-y_n".
..
.. bpo: 9146
.. date: 2017-09-03-14-10-00
.. nonce: _-oo-_
.. section: Library
Fix a segmentation fault in _hashopenssl when standard hash functions such
as md5 are not available in the linked OpenSSL library.  As in some special
FIPS-140 build environments.
..
.. bpo: 27144
.. date: 2017-08-30-11-26-14
.. nonce: PEDJsE
.. section: Library
The ``map()`` and ``as_completed()`` iterators in ``concurrent.futures`` now
avoid keeping a reference to yielded objects.
..
.. bpo: 10746
.. date: 2017-08-28-13-01-05
.. nonce: nmAvfu
.. section: Library
Fix ctypes producing wrong :pep:`3118` type codes for integer types.
..
.. bpo: 22536
.. date: 2017-08-23
.. nonce: _narf_
.. section: Library
The subprocess module now sets the filename when FileNotFoundError is raised
on POSIX systems due to the executable or cwd not being found.
..
.. bpo: 31249
.. date: 2017-08-22-12-44-48
.. nonce: STPbb9
.. section: Library
concurrent.futures: WorkItem.run() used by ThreadPoolExecutor now breaks a
reference cycle between an exception object and the WorkItem object.
..
.. bpo: 31247
.. date: 2017-08-21-17-50-27
.. nonce: 8S3zJp
.. section: Library
xmlrpc.server now explicitly breaks reference cycles when using
sys.exc_info() in code handling exceptions.
..
.. bpo: 30102
.. date: 2017-08-16-21-14-31
.. nonce: 1sPqmc
.. section: Library
The ssl and hashlib modules now call OPENSSL_add_all_algorithms_noconf() on
OpenSSL < 1.1.0. The function detects CPU features and enables optimizations
on some CPU architectures such as POWER8. Patch is based on research from
Gustavo Serra Scalet.
..
.. bpo: 31185
.. date: 2017-08-11-19-30-00
.. nonce: i6TPgL
.. section: Library
Fixed miscellaneous errors in asyncio speedup module.
..
.. bpo: 31135
.. date: 2017-08-08-14-44-37
.. nonce: HH94xR
.. section: Library
ttk: fix the destroy() method of LabeledScale and OptionMenu classes. Call
the parent destroy() method even if the used attribute doesn't exist. The
LabeledScale.destroy() method now also explicitly clears label and scale
attributes to help the garbage collector to destroy all widgets.
..
.. bpo: 31107
.. date: 2017-08-02-12-48-15
.. nonce: 1t2hn5
.. section: Library
Fix ``copyreg._slotnames()`` mangled attribute calculation for classes whose
name begins with an underscore. Patch by Shane Harvey.
..
.. bpo: 31061
.. date: 2017-08-01-09-32-58
.. nonce: husAYX
.. section: Library
Fixed a crash when using asyncio and threads.
..
.. bpo: 30502
.. date: 2017-07-27-11-33-58
.. nonce: GJlfU8
.. section: Library
Fix handling of long oids in ssl.  Based on patch by Christian Heimes.
..
.. bpo: 30119
.. date: 2017-07-26-15-15-00
.. nonce: DZ6C_S
.. section: Library
ftplib.FTP.putline() now throws ValueError on commands that contains CR or
LF. Patch by Donghee Na.
..
.. bpo: 30595
.. date: 2017-07-26-04-46-12
.. nonce: -zJ7d8
.. section: Library
multiprocessing.Queue.get() with a timeout now polls its reader in
non-blocking mode if it succeeded to acquire the lock but the acquire took
longer than the timeout.
..
.. bpo: 29403
.. date: 2017-07-20-02-29-49
.. nonce: 3RinCV
.. section: Library
Fix ``unittest.mock``'s autospec to not fail on method-bound builtin
functions.  Patch by Aaron Gallagher.
..
.. bpo: 30961
.. date: 2017-07-18-23-47-51
.. nonce: 064jz0
.. section: Library
Fix decrementing a borrowed reference in tracemalloc.
..
.. bpo: 25684
.. date: 2017-07-17-11-35-00
.. nonce: usELVx
.. section: Library
Change ``ttk.OptionMenu`` radiobuttons to be unique across instances of
``OptionMenu``.
..
.. bpo: 30886
.. date: 2017-07-10-12-14-22
.. nonce: nqQj34
.. section: Library
Fix multiprocessing.Queue.join_thread(): it now waits until the thread
completes, even if the thread was started by the same process which created
the queue.
..
.. bpo: 29854
.. date: 2017-07-07-02-18-57
.. nonce: J8wKb_
.. section: Library
Fix segfault in readline when using readline's history-size option.  Patch
by Nir Soffer.
..
.. bpo: 30319
.. date: 2017-07-04-13-48-21
.. nonce: hg_3TX
.. section: Library
socket.close() now ignores ECONNRESET error.
..
.. bpo: 30828
.. date: 2017-07-04-13-10-52
.. nonce: CLvEvV
.. section: Library
Fix out of bounds write in ``asyncio.CFuture.remove_done_callback()``.
..
.. bpo: 30807
.. date: 2017-06-29-22-04-44
.. nonce: sLtjY-
.. section: Library
signal.setitimer() may disable the timer when passed a tiny value.
Tiny values (such as 1e-6) are valid non-zero values for setitimer(), which
is specified as taking microsecond-resolution intervals. However, on some
platform, our conversion routine could convert 1e-6 into a zero interval,
therefore disabling the timer instead of (re-)scheduling it.
..
.. bpo: 30441
.. date: 2017-06-29-14-25-14
.. nonce: 3Wh9kc
.. section: Library
Fix bug when modifying os.environ while iterating over it
..
.. bpo: 30532
.. date: 2017-06-26-11-01-59
.. nonce: qTeL1o
.. section: Library
Fix email header value parser dropping folding white space in certain cases.
..
.. bpo: 30879
.. date: 03
.. nonce: N3KI-o
.. section: Library
os.listdir() and os.scandir() now emit bytes names when called with
bytes-like argument.
..
.. bpo: 30746
.. date: 02
.. nonce: 7drQI0
.. section: Library
Prohibited the '=' character in environment variable names in
``os.putenv()`` and ``os.spawn*()``.
..
.. bpo: 29755
.. date: 01
.. nonce: diQcY_
.. section: Library
Fixed the lgettext() family of functions in the gettext module. They now
always return bytes.
..
.. bpo: 31294
.. date: 2017-09-07-20-49-09
.. nonce: WgI18w
.. section: Documentation
Fix incomplete code snippet in the ZeroMQSocketListener and
ZeroMQSocketHandler examples and adapt them to Python 3.
..
.. bpo: 21649
.. date: 2017-09-06-10-11-57
.. nonce: EUvqA9
.. section: Documentation
Add RFC 7525 and Mozilla server side TLS links to SSL documentation.
..
.. bpo: 30803
.. date: 2017-07-29-14-55-50
.. nonce: 6hutqQ
.. section: Documentation
Clarify doc on truth value testing. Original patch by Peter Thomassen.
..
.. bpo: 31320
.. date: 2017-09-05-14-23-35
.. nonce: JRDHx7
.. section: Tests
Silence traceback in test_ssl
..
.. bpo: 25674
.. date: 2017-09-04-13-03-55
.. nonce: whVTXh
.. section: Tests
Remove sha256.tbs-internet.com ssl test
..
.. bpo: 30715
.. date: 2017-07-25-15-27-44
.. nonce: Sp7bTF
.. section: Tests
Address ALPN callback changes for OpenSSL 1.1.0f. The latest version behaves
like OpenSSL 1.0.2 and no longer aborts handshake.
..
.. bpo: 30822
.. date: 2017-07-20-14-29-54
.. nonce: X0wREo
.. section: Tests
regrtest: Exclude tzdata from regrtest --all. When running the test suite
using --use=all / -u all, exclude tzdata since it makes test_datetime too
slow (15-20 min on some buildbots) which then times out on some buildbots.
Fix also regrtest command line parser to allow passing -u extralargefile to
run test_zipfile64.
..
.. bpo: 30854
.. date: 2017-07-05-16-54-59
.. nonce: sPADRI
.. section: Build
Fix compile error when compiling --without-threads. Patch by Masayuki
Yamamoto.
..
.. bpo: 30389
.. date: 2017-09-06-17-14-54
.. nonce: 9Dizrx
.. section: Windows
Adds detection of Visual Studio 2017 to distutils on Windows.
..
.. bpo: 31340
.. date: 2017-09-04-13-19-05
.. nonce: MbkzLi
.. section: Windows
Change to building with MSVC v141 (included with Visual Studio 2017)
..
.. bpo: 30581
.. date: 2017-08-04-10-05-19
.. nonce: OQhR7l
.. section: Windows
os.cpu_count() now returns the correct number of processors on Windows when
the number of logical processors is greater than 64.
..
.. bpo: 30731
.. date: 2017-07-13-11-22-53
.. nonce: nmMDwI
.. section: Windows
Add a missing xmlns to python.manifest so that it matches the schema.
..
.. bpo: 31493
.. date: 2017-09-16-23-43-39
.. nonce: nmHMCR
.. section: IDLE
IDLE code context -- fix code update and font update timers.
Canceling timers prevents a warning message when test_idle completes.
..
.. bpo: 31488
.. date: 2017-09-16-01-21-20
.. nonce: 0rtXIT
.. section: IDLE
IDLE - Update non-key options in former extension classes. When applying
configdialog changes, call .reload for each feature class. Change ParenMatch
so updated options affect existing instances attached to existing editor
windows.
..
.. bpo: 31477
.. date: 2017-09-15-12-38-47
.. nonce: n__6sa
.. section: IDLE
IDLE - Improve rstrip entry in doc. Strip trailing whitespace strips more
than blank spaces.  Multiline string literals are not skipped.
..
.. bpo: 31480
.. date: 2017-09-14-17-53-53
.. nonce: 4WJ0pl
.. section: IDLE
IDLE - make tests pass with zzdummy extension disabled by default.
..
.. bpo: 31421
.. date: 2017-09-12-08-38-27
.. nonce: mYfQNq
.. section: IDLE
Document how IDLE runs tkinter programs. IDLE calls tcl/tk update in the
background in order to make live
interaction and experimentation with tkinter applications much easier.
..
.. bpo: 31414
.. date: 2017-09-11-15-46-05
.. nonce: wiepgK
.. section: IDLE
IDLE -- fix tk entry box tests by deleting first. Adding to an int entry is
not the same as deleting and inserting because int('') will fail.
..
.. bpo: 31051
.. date: 2017-08-30-00-06-58
.. nonce: 50Jp_Q
.. section: IDLE
Rearrange IDLE configdialog GenPage into Window, Editor, and Help sections.
..
.. bpo: 30617
.. date: 2017-08-27-16-49-36
.. nonce: UHnswr
.. section: IDLE
IDLE - Add docstrings and tests for outwin subclass of editor.
Move some data and functions from the class to module level. Patch by Cheryl
Sabella.
..
.. bpo: 31287
.. date: 2017-08-27-15-31-33
.. nonce: aZERfI
.. section: IDLE
IDLE - Do not modify tkinter.message in test_configdialog.
..
.. bpo: 27099
.. date: 2017-08-24-13-48-16
.. nonce: rENefC
.. section: IDLE
Convert IDLE's built-in 'extensions' to regular features.
About 10 IDLE features were implemented as supposedly optional extensions.
Their different behavior could be confusing or worse for users and not good
for maintenance.  Hence the conversion.
The main difference for users is that user configurable key bindings for
builtin features are now handled uniformly.  Now, editing a binding in a
keyset only affects its value in the keyset.  All bindings are defined
together in the system-specific default keysets in config-extensions.def.
All custom keysets are saved as a whole in config-extension.cfg.  All take
effect as soon as one clicks Apply or Ok.
The affected events are '<<force-open-completions>>', '<<expand-word>>',
'<<force-open-calltip>>', '<<flash-paren>>', '<<format-paragraph>>',
'<<run-module>>', '<<check-module>>', and '<<zoom-height>>'.  Any (global)
customizations made before 3.6.3 will not affect their keyset-specific
customization after 3.6.3. and vice versa.
Initial patch by Charles Wohlganger.
..
.. bpo: 31206
.. date: 2017-08-18-14-13-42
.. nonce: F1-tKK
.. section: IDLE
IDLE: Factor HighPage(Frame) class from ConfigDialog. Patch by Cheryl
Sabella.
..
.. bpo: 31001
.. date: 2017-08-17-15-00-20
.. nonce: KLxYHC
.. section: IDLE
Add tests for configdialog highlight tab.  Patch by Cheryl Sabella.
..
.. bpo: 31205
.. date: 2017-08-15-12-58-23
.. nonce: iuziZ5
.. section: IDLE
IDLE: Factor KeysPage(Frame) class from ConfigDialog.  The slightly modified
tests continue to pass.  Patch by Cheryl Sabella.
..
.. bpo: 31130
.. date: 2017-08-07-14-02-56
.. nonce: FbsC7f
.. section: IDLE
IDLE -- stop leaks in test_configdialog. Initial patch by Victor Stinner.
..
.. bpo: 31002
.. date: 2017-08-03-17-54-02
.. nonce: kUSgTE
.. section: IDLE
Add tests for configdialog keys tab. Patch by Cheryl Sabella.
..
.. bpo: 19903
.. date: 2017-08-03-14-08-42
.. nonce: sqE1FS
.. section: IDLE
IDLE: Calltips use ``inspect.signature`` instead of ``inspect.getfullargspec``.
This improves calltips for builtins converted to use Argument Clinic. Patch
by Louie Lu.
..
.. bpo: 31083
.. date: 2017-07-31-23-20-51
.. nonce: 991FXm
.. section: IDLE
IDLE - Add an outline of a TabPage class in configdialog. Update existing
classes to match outline. Initial patch by Cheryl Sabella.
..
.. bpo: 31050
.. date: 2017-07-30-17-39-59
.. nonce: AXR3kP
.. section: IDLE
Factor GenPage(Frame) class from ConfigDialog. The slightly modified tests
continue to pass. Patch by Cheryl Sabella.
..
.. bpo: 31004
.. date: 2017-07-30-01-00-58
.. nonce: m8cc1t
.. section: IDLE
IDLE - Factor FontPage(Frame) class from ConfigDialog.
Slightly modified tests continue to pass. Fix General tests. Patch mostly by
Cheryl Sabella.
..
.. bpo: 30781
.. date: 2017-07-28-18-59-06
.. nonce: ud5m18
.. section: IDLE
IDLE - Use ttk widgets in ConfigDialog. Patches by Terry Jan Reedy and
Cheryl Sabella.
..
.. bpo: 31060
.. date: 2017-07-27-14-48-42
.. nonce: GdY_VY
.. section: IDLE
IDLE - Finish rearranging methods of ConfigDialog Grouping methods
pertaining to each tab and the buttons will aid writing tests and improving
the tabs and will enable splitting the groups into classes.
..
.. bpo: 30853
.. date: 2017-07-27-10-01-14
.. nonce: enPvvc
.. section: IDLE
IDLE -- Factor a VarTrace class out of ConfigDialog.
Instance tracers manages pairs consisting of a tk variable and a callback
function.  When tracing is turned on, setting the variable calls the
function.  Test coverage for the new class is 100%.
..
.. bpo: 31003
.. date: 2017-07-25-01-28-35
.. nonce: bYINVH
.. section: IDLE
IDLE: Add more tests for General tab.
..
.. bpo: 30993
.. date: 2017-07-22-18-08-41
.. nonce: 34vJkB
.. section: IDLE
IDLE - Improve configdialog font page and tests.
In configdialog: Document causal pathways in create_font_tab docstring.
Simplify some attribute names. Move set_samples calls to var_changed_font
(idea from Cheryl Sabella).  Move related functions to positions after the
create widgets function.
In test_configdialog: Fix test_font_set so not order dependent.  Fix renamed
test_indent_scale so it tests the widget.  Adjust tests for movement of
set_samples call.  Add tests for load functions.  Put all font tests in one
class and tab indent tests in another.  Except for two lines, these tests
completely cover the related functions.
..
.. bpo: 30981
.. date: 2017-07-21-01-55-14
.. nonce: ZFvQPt
.. section: IDLE
IDLE -- Add more configdialog font page tests.
..
.. bpo: 28523
.. date: 2017-07-21-00-54-52
.. nonce: OPcqYJ
.. section: IDLE
IDLE: replace 'colour' with 'color' in configdialog.
..
.. bpo: 30917
.. date: 2017-07-17-23-35-57
.. nonce: hSiuuO
.. section: IDLE
Add tests for idlelib.config.IdleConf. Increase coverage from 46% to 96%.
Patch by Louie Lu.
..
.. bpo: 30934
.. date: 2017-07-15-22-26-57
.. nonce: BanuSB
.. section: IDLE
Document coverage details for idlelib tests.
Add section to idlelib/idle-test/README.txt.
Include check that branches are taken both ways.
Exclude IDLE-specific code that does not run during unit tests.
..
.. bpo: 30913
.. date: 2017-07-13-23-07-33
.. nonce: aezn_e
.. section: IDLE
IDLE: Document ConfigDialog tk Vars, methods, and widgets in docstrings This
will facilitate improving the dialog and splitting up the class. Original
patch by Cheryl Sabella.
..
.. bpo: 30899
.. date: 2017-07-11-02-26-17
.. nonce: SQmVO8
.. section: IDLE
IDLE: Add tests for ConfigParser subclasses in config. Patch by Louie Lu.
..
.. bpo: 30881
.. date: 2017-07-11-02-21-42
.. nonce: 4KAq_9
.. section: IDLE
IDLE: Add docstrings to browser.py. Patch by Cheryl Sabella.
..
.. bpo: 30851
.. date: 2017-07-09-23-53-00
.. nonce: AHXBYa
.. section: IDLE
IDLE: Remove unused variables in configdialog.  One is a duplicate, one is
set but cannot be altered by users. Patch by Cheryl Sabella.
..
.. bpo: 30870
.. date: 2017-07-08-17-57-04
.. nonce: IcR2pf
.. section: IDLE
IDLE: In Settings dialog, select font with Up, Down keys as well as mouse.
Initial patch by Louie Lu.
..
.. bpo: 8231
.. date: 2017-07-07-21-10-55
.. nonce: yEge3L
.. section: IDLE
IDLE: call config.IdleConf.GetUserCfgDir only once.
..
.. bpo: 30779
.. date: 2017-07-07-20-26-37
.. nonce: 8KXEXN
.. section: IDLE
IDLE: Factor ConfigChanges class from configdialog, put in config; test. *
In config, put dump test code in a function; run it and unittest in   'if
__name__ == '__main__'. * Add class config.ConfigChanges based on
changes_class_v4.py on bpo issue. * Add class test_config.ChangesTest,
partly using configdialog_tests_v1.py. * Revise configdialog to use
ConfigChanges; see tracker msg297804. * Revise test_configdialog to match
configdialog changes. * Remove configdialog functions unused or moved to
ConfigChanges. Cheryl Sabella contributed parts of the patch.
..
.. bpo: 30777
.. date: 2017-07-04-22-45-46
.. nonce: uxzlMB
.. section: IDLE
IDLE: configdialog - Add docstrings and fix comments. Patch by Cheryl
Sabella.
..
.. bpo: 30495
.. date: 2017-06-29-18-23-06
.. nonce: qIWgc4
.. section: IDLE
IDLE: Improve textview with docstrings, PEP8 names, and more tests. Patch by
Cheryl Sabella.
..
.. bpo: 30723
.. date: 2017-06-27-19-05-40
.. nonce: rQh06y
.. section: IDLE
IDLE: Make several improvements to parenmatch. Add 'parens' style to
highlight both opener and closer. Make 'default' style, which is not
default, a synonym for 'opener'. Make time-delay work the same with all
styles. Add help for config dialog extensions tab, including help for
parenmatch. Add new tests.  Original patch by Charles Wohlganger.
..
.. bpo: 30674
.. date: 2017-06-27-01-40-34
.. nonce: ppK_q8
.. section: IDLE
IDLE: add docstrings to grep module. Patch by Cheryl Sabella
..
.. bpo: 21519
.. date: 2017-06-27-00-29-56
.. nonce: fTj9T0
.. section: IDLE
IDLE's basic custom key entry dialog now detects duplicates properly.
Original patch by Saimadhav Heblikar.
..
.. bpo: 29910
.. date: 2017-06-26-22-45-27
.. nonce: mqHh7u
.. section: IDLE
IDLE no longer deletes a character after commenting out a region by a key
shortcut.  Add ``return 'break'`` for this and other potential conflicts
between IDLE and default key bindings.
..
.. bpo: 30728
.. date: 2017-06-26-15-47-13
.. nonce: qH4TGL
.. section: IDLE
Review and change idlelib.configdialog names. Lowercase method and attribute
names. Replace 'colour' with 'color', expand overly cryptic names, delete
unneeded underscores. Replace ``import *`` with specific imports. Patches by
Cheryl Sabella.
..
.. bpo: 6739
.. date: 2017-06-26-00-28-59
.. nonce: x5MfhB
.. section: IDLE
IDLE: Verify user-entered key sequences by trying to bind them with tk. Add
tests for all 3 validation functions. Original patch by G Polo.  Tests added
by Cheryl Sabella.
..
.. bpo: 30983
.. date: 2017-08-18-17-19-23
.. nonce: ggGz9z
.. section: Tools/Demos
gdb integration commands (py-bt, etc.) work on optimized shared builds now,
too.  :pep:`523` introduced _PyEval_EvalFrameDefault which inlines
PyEval_EvalFrameEx on non-debug shared builds.  This broke the ability to
use py-bt, py-up, and a few other Python-specific gdb integrations. The
problem is fixed by only looking for _PyEval_EvalFrameDefault frames in
python-gdb.py.  Original patch by Bruno "Polaco" Penteado.

Put news entry `blurb`_ files for the *Tests* section in this directory.
.. _blurb: https://pypi.org/project/blurb/

Add support for parametrized resource ``wantobjects`` in regrtests,
which allows to run Tkinter tests with the specified value of
:data:`!tkinter.wantobjects`, for example ``-u wantobjects=0``.

Put news entry `blurb`_ files for the *IDLE* section in this directory.
.. _blurb: https://pypi.org/project/blurb/

Better explain the operation of Format / Format Paragraph.

Eliminate redundant refcounting from ``BINARY_OP_EXTEND``.

Fix erroneous "cannot reuse already awaited coroutine" error that could
occur when a generator was run during the process of clearing a coroutine's
frame.

Generator expressions in 3.15 now conform to the documented behavior when
the iterable does not support iteration. This matches the behavior in 3.14
and earlier

Fix JIT tracer memory leak, ensure the JIT tracer state is freed when daemon threads are cleaned up during interpreter shutdown.

Fixes a crash in ``ga_repr_items_list`` function.

Put news entry `blurb`_ files for the *Core and Builtins* section in this directory.
.. _blurb: https://pypi.org/project/blurb/

If we are specializing to ``LOAD_GLOBAL_MODULE`` or ``LOAD_ATTR_MODULE``, try
to enable deferred reference counting for the value, if the object is owned by
a different thread.  This applies to the free-threaded build only and should
improve scaling of multi-threaded programs. Note that when deferred reference
counting is enabled, the object will be deallocated by the GC, rather than by
:c:func:`Py_DECREF`.

Check if the result is ``NULL`` in ``BINARY_OP_EXTENT`` opcode.

Eliminate redundant refcounting in the JIT for ``BINARY_OP``.

:meth:`bytes.translate` now allows the compiler to unroll its loop more
usefully for a 2x speedup in the common no-deletions specified case.

Fix crash in :class:`set` when objects with the same hash are concurrently
added to the set after removing an element with the same hash while the set
still contains elements with the same hash.

:class:`bytearray` buffers now have the same alignment
when empty as when allocated. Unaligned buffers can still be created by slicing.

Improve error messages for printf-style formatting.
For errors in the format string, always include the position of the
start of the format unit.
For errors related to the formatted arguments, always include the number
or the name of the argument.
Raise more specific errors and include more information (type and number
of arguments, most probable causes of error).

Put news entry `blurb`_ files for the *macOS* section in this directory.
.. _blurb: https://pypi.org/project/blurb/

Add support for OpenSSL 3.6, drop EOL 3.2. Patch by Hugo van Kemenade.

Move WASI-related files to :file:`Platforms/WASI`. Along the way, leave a
deprecated :file:`Tools/wasm/wasi/__main__.py` behind for
backwards-compatibility.

Put news entry `blurb`_ files for the *Build* section in this directory.
.. _blurb: https://pypi.org/project/blurb/

Prevent static builds from clashing with curses by making the optimizer
COLORS table static.

Added :c:func:`PyLong_GetNativeLayout`, :c:struct:`PyLongLayout`,
:c:struct:`PyLongExport`, :c:func:`PyLong_Export`,
:c:func:`PyLong_FreeExport`, :c:struct:`PyLongWriter`,
:c:func:`PyLongWriter_Create`, :c:func:`PyLongWriter_Finish` and
:c:func:`PyLongWriter_Discard` to the limited API.

Renamed :c:func:`!PyUnstable_Object_Dump` to :c:func:`PyObject_Dump`.

Put news entry `blurb`_ files for the *C API* section in this directory.
.. _blurb: https://pypi.org/project/blurb/

Put news entry `blurb`_ files for the *Tools/Demos* section in this directory.
.. _blurb: https://pypi.org/project/blurb/

Remove the :meth:`!isxidstart` and :meth:`!isxidcontinue` methods of
:data:`unicodedata.ucd_3_2_0`. They are now only exposed as
:func:`unicodedata.isxidstart` and :func:`unicodedata.isxidcontinue`.

Mime type ``image/jxl`` is now supported by :mod:`mimetypes`.

Fix a crash in :meth:`array.array.fromlist` when an element's :meth:`~object.__index__` method mutates
the input list during conversion.

:class:`annotationlib.ForwardRef` objects are now hashable when created from
annotation scopes with closures. Previously, hashing such objects would
throw an exception. Patch by Bartosz Sławecki.

Add the *missing_as_none* parameter to :func:`~urllib.parse.urlparse`,
:func:`~urllib.parse.urlsplit` and :func:`~urllib.parse.urldefrag`
functions. Add the *keep_empty* parameter to
:func:`~urllib.parse.urlunparse` and :func:`~urllib.parse.urlunsplit`
functions. This allows to distinguish between empty and not defined URI
components and preserve empty components.

Fix :func:`!ctypes.POINTER.set_type` not updating the format string to match the type.

Add an ``on_error`` keyword-only parameter to
:func:`multiprocessing.set_forkserver_preload` to control how import failures
during module preloading are handled. Accepts ``'ignore'`` (default, silent),
``'warn'`` (emit :exc:`ImportWarning`), or ``'fail'`` (raise exception).
Contributed by Nick Neumann and Gregory P. Smith.

Fixed a bug in :mod:`pdb` where expression results were not sent back to remote client.

Fixed :mod:`asyncio` debugging tools to work with new remote debugging API.
Patch by Bartosz Sławecki.

Fix an issue where :func:`inspect.getgeneratorstate` and :func:`inspect.getcoroutinestate` could fail for generators wrapped by :func:`types.coroutine` in the suspended state.

Put news entry `blurb`_ files for the *Library* section in this directory.
.. _blurb: https://pypi.org/project/blurb/

Fix potential thread safety issues in :mod:`ssl` module.

The Python implementation of :func:`functools.lru_cache` differed from the
default C implementation in that it did not check that its argument is
callable. This discrepancy is now fixed and both raise a :exc:`TypeError`.

Fixed validation of file descriptor 0 in posix functions when used with
follow_symlinks parameter.

Fix :meth:`io.BufferedReader.read1` state cleanup on buffer allocation failure.

Fix _decimal builds configured with EXTRA_FUNCTIONALITY by correcting the
Context.apply wrapper to pass the right argument.

Accepting ``+`` and ``/`` characters with an alternative alphabet in
:func:`base64.b64decode` and :func:`base64.urlsafe_b64decode` is now
deprecated.
In future Python versions they will be errors in the strict mode and
discarded in the non-strict mode.

Added the *ignorechars* parameter in :func:`binascii.a2b_base64` and
:func:`base64.b64decode`.

Fix a inconsistency issue in :meth:`~io.RawIOBase.write` that leads to
unexpected buffer overwrite by deduplicating the buffer exports.

:mod:`mimetypes`: Add support for DICOM files (for medical imaging) with the official MIME type ``application/dicom``. Patch by Benedikt Johannes.

Add new :mod:`tkinter` widget methods :meth:`!pack_content`,
:meth:`!place_content` and :meth:`!grid_content` which are alternative
spelling of old :meth:`!*_slaves` methods.

Fixed a crash in ctypes when using a deprecated ``POINTER(str)`` type in
``argtypes``. Instead of aborting, ctypes now raises a proper Python
exception when the pointer target type is unresolved.

Fix three crashes when non-string keyword arguments are supplied to objects
in the :mod:`ast` module.

Add :meth:`symtable.Function.get_cells` and :meth:`symtable.Symbol.is_cell` methods.

Use ``ppoll()`` if available in :func:`select.poll` to have a timeout
resolution of 1 nanosecond, instead of a resolution of 1 ms. Patch by Victor
Stinner.

:class:`array.array` buffers now have the same alignment when empty as when
allocated. Unaligned buffers can still be created by slicing.

Fix :func:`stat.filemode` in the pure-Python implementation to avoid misclassifying
invalid mode values as block devices.

Put news entry `blurb`_ files for the *Windows* section in this directory.
.. _blurb: https://pypi.org/project/blurb/

Support negative timestamps in :func:`time.gmtime`, :func:`time.localtime`, and various :mod:`datetime` functions.

Reject control characters in ``data:`` URL media types.

Put news entry `blurb`_ files for the *Security* section in this directory.
.. _blurb: https://pypi.org/project/blurb/

Reject control characters in :class:`http.cookies.Morsel` fields and values.

:mod:`~email.generator.BytesGenerator` will now refuse to serialize (write) headers
that are unsafely folded or delimited; see
:attr:`~email.policy.Policy.verify_generated_headers`. (Contributed by Bas
Bloemsaat and Petr Viktorin in :gh:`121650`).

Reject control characters in IMAP commands.

Fixed a bug in the folding of comments when flattening an email message
using a modern email policy. Comments consisting of a very long sequence of
non-foldable characters could trigger a forced line wrap that omitted the
required leading space on the continuation line, causing the remainder of
the comment to be interpreted as a new header field. This enabled header
injection with carefully crafted inputs.

Reject control characters in POP3 commands.

Reject C0 control characters within wsgiref.headers.Headers fields, values,
and parameters.


"""