Misc/NEWS.d/3.10.5.rst - platform/external/python/cpython3 - Git at Google

 .. date: 2022-06-01-17-47-40
 .. gh-issue: 93418
 .. nonce: 24dJuc
 .. release date: 2022-06-06
 .. section: Core and Builtins

 Fixed an assert where an f-string has an equal sign '=' following an
 expression, but there's no trailing brace. For example, f"{i=".

 ..

 .. date: 2022-05-25-04-07-22
 .. gh-issue: 91924
 .. nonce: -UyO4q
 .. section: Core and Builtins

 Fix ``__ltrace__`` debug feature if the stdout encoding is not UTF-8. Patch
 by Victor Stinner.

 ..

 .. date: 2022-05-22-02-37-50
 .. gh-issue: 93061
 .. nonce: r70Imp
 .. section: Core and Builtins

 Backward jumps after ``async for`` loops are no longer given dubious line
 numbers.

 ..

 .. date: 2022-05-21-23-21-37
 .. gh-issue: 93065
 .. nonce: 5I18WC
 .. section: Core and Builtins

 Fix contextvars HAMT implementation to handle iteration over deep trees.

 The bug was discovered and fixed by Eli Libman. See
 `MagicStack/immutables#84
 <https://github.com/MagicStack/immutables/issues/84>`_ for more details.

 ..

 .. date: 2022-05-12-09-38-20
 .. gh-issue: 92311
 .. nonce: VEgtts
 .. section: Core and Builtins

 Fixed a bug where setting ``frame.f_lineno`` to jump over a list
 comprehension could misbehave or crash.

 ..

 .. date: 2022-05-01-10-58-38
 .. gh-issue: 92112
 .. nonce: lLJemu
 .. section: Core and Builtins

 Fix crash triggered by an evil custom ``mro()`` on a metaclass.

 ..

 .. date: 2022-04-28-23-37-30
 .. gh-issue: 92036
 .. nonce: GZJAC9
 .. section: Core and Builtins

 Fix a crash in subinterpreters related to the garbage collector. When a
 subinterpreter is deleted, untrack all objects tracked by its GC. To prevent
 a crash in deallocator functions expecting objects to be tracked by the GC,
 leak a strong reference to these objects on purpose, so they are never
 deleted and their deallocator functions are not called. Patch by Victor
 Stinner.

 ..

 .. date: 2022-04-10-22-57-27
 .. gh-issue: 91421
 .. nonce: dHhv6U
 .. section: Core and Builtins

 Fix a potential integer overflow in _Py_DecodeUTF8Ex.

 ..

 .. bpo: 47212
 .. date: 2022-04-05-11-29-21
 .. nonce: leF4pz
 .. section: Core and Builtins

 Raise :exc:`IndentationError` instead of :exc:`SyntaxError` for a bare
 ``except`` with no following indent. Improve :exc:`SyntaxError` locations
 for an un-parenthesized generator used as arguments. Patch by Matthieu
 Dartiailh.

 ..

 .. bpo: 47182
 .. date: 2022-03-31-15-37-02
 .. nonce: e_4SsC
 .. section: Core and Builtins

 Fix a crash when using a named unicode character like ``"\N{digit nine}"``
 after the main interpreter has been initialized a second time.

 ..

 .. bpo: 46775
 .. date: 2022-03-30-02-36-25
 .. nonce: e3Oxqf
 .. section: Core and Builtins

 Some Windows system error codes(>= 10000) are now mapped into the correct
 errno and may now raise a subclass of :exc:`OSError`. Patch by Dong-hee Na.

 ..

 .. bpo: 47117
 .. date: 2022-03-26-15-45-57
 .. nonce: 60W6GQ
 .. section: Core and Builtins

 Fix a crash if we fail to decode characters in interactive mode if the
 tokenizer buffers are uninitialized. Patch by Pablo Galindo.

 ..

 .. bpo: 39829
 .. date: 2022-03-11-09-39-01
 .. nonce: mlW3Su
 .. section: Core and Builtins

 Removed the ``__len__()`` call when initializing a list and moved
 initializing to ``list_extend``. Patch by Jeremiah Pascual.

 ..

 .. bpo: 46962
 .. date: 2022-03-08-21-59-57
 .. nonce: UomDfz
 .. section: Core and Builtins

 Classes and functions that unconditionally declared their docstrings
 ignoring the `--without-doc-strings` compilation flag no longer do so.

 The classes affected are :class:`ctypes.UnionType`,
 :class:`pickle.PickleBuffer`, :class:`testcapi.RecursingInfinitelyError`,
 and :class:`types.GenericAlias`.

 The functions affected are 24 methods in :mod:`ctypes`.

 Patch by Oleg Iarygin.

 ..

 .. bpo: 36819
 .. date: 2021-09-28-10-58-30
 .. nonce: cyV50C
 .. section: Core and Builtins

 Fix crashes in built-in encoders with error handlers that return position
 less or equal than the starting position of non-encodable characters.

 ..

 .. date: 2022-05-26-23-10-55
 .. gh-issue: 93156
 .. nonce: 4XfDVN
 .. section: Library

 Accessing the :attr:`pathlib.PurePath.parents` sequence of an absolute path
 using negative index values produced incorrect results.

 ..

 .. date: 2022-05-22-16-08-01
 .. gh-issue: 89973
 .. nonce: jc-Q4g
 .. section: Library

 Fix :exc:`re.error` raised in :mod:`fnmatch` if the pattern contains a
 character range with upper bound lower than lower bound (e.g. ``[c-a]``).
 Now such ranges are interpreted as empty ranges.

 ..

 .. date: 2022-05-20-15-52-43
 .. gh-issue: 93010
 .. nonce: WF-cAc
 .. section: Library

 In a very special case, the email package tried to append the nonexistent
 ``InvalidHeaderError`` to the defect list. It should have been
 ``InvalidHeaderDefect``.

 ..

 .. date: 2022-05-16-14-35-39
 .. gh-issue: 92839
 .. nonce: owSMyo
 .. section: Library

 Fixed crash resulting from calling bisect.insort() or bisect.insort_left()
 with the key argument not equal to None.

 ..

 .. date: 2022-05-11-14-34-09
 .. gh-issue: 91581
 .. nonce: glkou2
 .. section: Library

 :meth:`~datetime.datetime.utcfromtimestamp` no longer attempts to resolve
 ``fold`` in the pure Python implementation, since the fold is never 1 in
 UTC. In addition to being slightly faster in the common case, this also
 prevents some errors when the timestamp is close to :attr:`datetime.min
 <datetime.datetime.min>`.  Patch by Paul Ganssle.

 ..

 .. date: 2022-05-09-09-28-02
 .. gh-issue: 92530
 .. nonce: M4Q1RS
 .. section: Library

 Fix an issue that occurred after interrupting
 :func:`threading.Condition.notify`.

 ..

 .. date: 2022-04-30-10-53-10
 .. gh-issue: 92049
 .. nonce: 5SEKoh
 .. section: Library

 Forbid pickling constants ``re._constants.SUCCESS`` etc. Previously,
 pickling did not fail, but the result could not be unpickled.

 ..

 .. bpo: 47029
 .. date: 2022-04-26-19-01-13
 .. nonce: qkT42X
 .. section: Library

 Always close the read end of the pipe used by :class:`multiprocessing.Queue`
 *after* the last write of buffered data to the write end of the pipe to
 avoid :exc:`BrokenPipeError` at garbage collection and at
 :meth:`multiprocessing.Queue.close` calls. Patch by Géry Ogam.

 ..

 .. date: 2022-04-26-00-10-06
 .. gh-issue: 91401
 .. nonce: mddRC8
 .. section: Library

 Provide a fail-safe way to disable :mod:`subprocess` use of ``vfork()`` via
 a private ``subprocess._USE_VFORK`` attribute. While there is currently no
 known need for this, if you find a need please only set it to ``False``.
 File a CPython issue as to why you needed it and link to that from a comment
 in your code. This attribute is documented as a footnote in 3.11.

 ..

 .. date: 2022-04-25-14-18-01
 .. gh-issue: 91910
 .. nonce: kY-JR0
 .. section: Library

 Add missing f prefix to f-strings in error messages from the
 :mod:`multiprocessing` and :mod:`asyncio` modules.

 ..

 .. date: 2022-04-25-10-23-01
 .. gh-issue: 91810
 .. nonce: DOHa6B
 .. section: Library

 :class:`~xml.etree.ElementTree.ElementTree` method
 :meth:`~xml.etree.ElementTree.ElementTree.write` and function
 :func:`~xml.etree.ElementTree.tostring` now use the text file's encoding
 ("UTF-8" if not available) instead of locale encoding in XML declaration
 when ``encoding="unicode"`` is specified.

 ..

 .. date: 2022-04-23-03-24-00
 .. gh-issue: 91832
 .. nonce: TyLi65
 .. section: Library

 Add ``required`` attribute to :class:`argparse.Action` repr output.

 ..

 .. date: 2022-04-20-09-49-33
 .. gh-issue: 91734
 .. nonce: 4Dj4Gy
 .. section: Library

 Fix OSS audio support on Solaris.

 ..

 .. date: 2022-04-19-17-30-17
 .. gh-issue: 91700
 .. nonce: MRJi6m
 .. section: Library

 Compilation of regular expression containing a conditional expression
 ``(?(group)...)`` now raises an appropriate :exc:`re.error` if the group
 number refers to not defined group. Previously an internal RuntimeError was
 raised.

 ..

 .. date: 2022-04-19-04-33-39
 .. gh-issue: 91676
 .. nonce: ceQBwh
 .. section: Library

 Fix :class:`unittest.IsolatedAsyncioTestCase` to shutdown the per test event
 loop executor before returning from its ``run`` method so that a not yet
 stopped or garbage collected executor state does not persist beyond the
 test.

 ..

 .. date: 2022-04-18-16-31-33
 .. gh-issue: 90568
 .. nonce: 9kiU7o
 .. section: Library

 Parsing ``\N`` escapes of Unicode Named Character Sequences in a
 :mod:`regular expression <re>` raises now :exc:`re.error` instead of
 ``TypeError``.

 ..

 .. date: 2022-04-16-05-12-13
 .. gh-issue: 91595
 .. nonce: CocJBv
 .. section: Library

 Fix the comparison of character and integer inside
 :func:`Tools.gdb.libpython.write_repr`. Patch by Yu Liu.

 ..

 .. date: 2022-04-15-22-07-36
 .. gh-issue: 90622
 .. nonce: 0C6l8h
 .. section: Library

 Worker processes for :class:`concurrent.futures.ProcessPoolExecutor` are no
 longer spawned on demand (a feature added in 3.9) when the multiprocessing
 context start method is ``"fork"`` as that can lead to deadlocks in the
 child processes due to a fork happening while threads are running.

 ..

 .. date: 2022-04-15-18-38-21
 .. gh-issue: 91575
 .. nonce: fSyAxS
 .. section: Library

 Update case-insensitive matching in the :mod:`re` module to the latest
 Unicode version.

 ..

 .. date: 2022-04-15-13-16-25
 .. gh-issue: 91581
 .. nonce: 9OGsrN
 .. section: Library

 Remove an unhandled error case in the C implementation of calls to
 :meth:`datetime.fromtimestamp <datetime.datetime.fromtimestamp>` with no
 time zone (i.e. getting a local time from an epoch timestamp). This should
 have no user-facing effect other than giving a possibly more accurate error
 message when called with timestamps that fall on 10000-01-01 in the local
 time. Patch by Paul Ganssle.

 ..

 .. bpo: 47260
 .. date: 2022-04-08-14-30-53
 .. nonce: TtcNxI
 .. section: Library

 Fix ``os.closerange()`` potentially being a no-op in a Linux seccomp
 sandbox.

 ..

 .. bpo: 39064
 .. date: 2022-04-03-19-40-09
 .. nonce: 76PbIz
 .. section: Library

 :class:`zipfile.ZipFile` now raises :exc:`zipfile.BadZipFile` instead of
 ``ValueError`` when reading a corrupt zip file in which the central
 directory offset is negative.

 ..

 .. bpo: 47151
 .. date: 2022-03-30-01-17-43
 .. nonce: z-nQkR
 .. section: Library

 When subprocess tries to use vfork, it now falls back to fork if vfork
 returns an error. This allows use in situations where vfork isn't allowed by
 the OS kernel.

 ..

 .. bpo: 27929
 .. date: 2022-03-28-13-35-50
 .. nonce: j5mAmV
 .. section: Library

 Fix :meth:`asyncio.loop.sock_connect` to only resolve names for
 :const:`socket.AF_INET` or :const:`socket.AF_INET6` families. Resolution may
 not make sense for other families, like :const:`socket.AF_BLUETOOTH` and
 :const:`socket.AF_UNIX`.

 ..

 .. bpo: 43323
 .. date: 2022-03-27-12-40-16
 .. nonce: 9mFPuI
 .. section: Library

 Fix errors in the :mod:`email` module if the charset itself contains
 undecodable/unencodable characters.

 ..

 .. bpo: 47101
 .. date: 2022-03-23-15-31-02
 .. nonce: rVSld-
 .. section: Library

 :const:`hashlib.algorithms_available` now lists only algorithms that are
 provided by activated crypto providers on OpenSSL 3.0. Legacy algorithms are
 not listed unless the legacy provider has been loaded into the default OSSL
 context.

 ..

 .. bpo: 46787
 .. date: 2022-02-18-20-09-29
 .. nonce: juwWc0
 .. section: Library

 Fix :class:`concurrent.futures.ProcessPoolExecutor` exception memory leak

 ..

 .. bpo: 45393
 .. date: 2022-02-09-23-44-27
 .. nonce: 9v5Y8U
 .. section: Library

 Fix the formatting for ``await x`` and ``not x`` in the operator precedence
 table when using the :func:`help` system.

 ..

 .. bpo: 46415
 .. date: 2022-01-17-16-53-30
 .. nonce: 6wSYg-
 .. section: Library

 Fix ipaddress.ip_{address,interface,network} raising TypeError instead of
 ValueError if given invalid tuple as address parameter.

 ..

 .. bpo: 28249
 .. date: 2022-01-09-14-23-00
 .. nonce: 4dzB80
 .. section: Library

 Set :attr:`doctest.DocTest.lineno` to ``None`` when object does not have
 :attr:`__doc__`.

 ..

 .. bpo: 45138
 .. date: 2021-09-08-16-21-03
 .. nonce: yghUrK
 .. section: Library

 Fix a regression in the :mod:`sqlite3` trace callback where bound parameters
 were not expanded in the passed statement string. The regression was
 introduced in Python 3.10 by :issue:`40318`. Patch by Erlend E. Aasland.

 ..

 .. bpo: 44493
 .. date: 2021-07-26-10-46-49
 .. nonce: xp3CRH
 .. section: Library

 Add missing terminated NUL in sockaddr_un's length

 This was potentially observable when using non-abstract AF_UNIX datagram
 sockets to processes written in another programming language.

 ..

 .. bpo: 42627
 .. date: 2021-05-22-07-58-59
 .. nonce: EejtD0
 .. section: Library

 Fix incorrect parsing of Windows registry proxy settings

 ..

 .. bpo: 36073
 .. date: 2019-06-22-11-01-45
 .. nonce: ED8mB9
 .. section: Library

 Raise :exc:`~sqlite3.ProgrammingError` instead of segfaulting on recursive
 usage of cursors in :mod:`sqlite3` converters. Patch by Sergey Fedoseev.

 ..

 .. date: 2022-05-26-11-33-23
 .. gh-issue: 86438
 .. nonce: kEGGmK
 .. section: Documentation

 Clarify that :option:`-W` and :envvar:`PYTHONWARNINGS` are matched literally
 and case-insensitively, rather than as regular expressions, in
 :mod:`warnings`.

 ..

 .. date: 2022-05-18-23-58-26
 .. gh-issue: 92240
 .. nonce: bHvYiz
 .. section: Documentation

 Added release dates for "What's New in Python 3.X" for 3.0, 3.1, 3.2, 3.8
 and 3.10

 ..

 .. date: 2022-04-24-22-09-31
 .. gh-issue: 91888
 .. nonce: kTjJLx
 .. section: Documentation

 Add a new ``gh`` role to the documentation to link to GitHub issues.

 ..

 .. date: 2022-04-23-00-22-54
 .. gh-issue: 91783
 .. nonce: N09dRR
 .. section: Documentation

 Document security issues concerning the use of the function
 :meth:`shutil.unpack_archive`

 ..

 .. date: 2022-04-19-20-16-00
 .. gh-issue: 91547
 .. nonce: LsNWER
 .. section: Documentation

 Remove "Undocumented modules" page.

 ..

 .. bpo: 44347
 .. date: 2022-04-10-20-28-20
 .. nonce: Q1m3DM
 .. section: Documentation

 Clarify the meaning of *dirs_exist_ok*, a kwarg of :func:`shutil.copytree`.

 ..

 .. bpo: 38668
 .. date: 2022-04-01-09-28-31
 .. nonce: j4mrqW
 .. section: Documentation

 Update the introduction to documentation for :mod:`os.path` to remove
 warnings that became irrelevant after the implementations of :pep:`383` and
 :pep:`529`.

 ..

 .. bpo: 47138
 .. date: 2022-03-28-12-29-42
 .. nonce: 2B4N-k
 .. section: Documentation

 Pin Jinja to a version compatible with Sphinx version 3.2.1.

 ..

 .. bpo: 46962
 .. date: 2022-03-08-22-10-38
 .. nonce: FIVe9I
 .. section: Documentation

 All docstrings in code snippets are now wrapped into :func:`PyDoc_STR` to
 follow the guideline of `PEP 7's Documentation Strings paragraph
 <https://www.python.org/dev/peps/pep-0007/#documentation-strings>`_. Patch
 by Oleg Iarygin.

 ..

 .. bpo: 26792
 .. date: 2022-01-23-20-44-53
 .. nonce: dQ1v1W
 .. section: Documentation

 Improve the docstrings of :func:`runpy.run_module` and
 :func:`runpy.run_path`. Original patch by Andrew Brezovsky.

 ..

 .. bpo: 40838
 .. date: 2022-01-13-16-03-15
 .. nonce: k3NVCf
 .. section: Documentation

 Document that :func:`inspect.getdoc`, :func:`inspect.getmodule`, and
 :func:`inspect.getsourcefile` might return ``None``.

 ..

 .. bpo: 45790
 .. date: 2021-11-12-11-03-55
 .. nonce: 6yuhe8
 .. section: Documentation

 Adjust inaccurate phrasing in :doc:`../extending/newtypes_tutorial` about
 the ``ob_base`` field and the macros used to access its contents.

 ..

 .. bpo: 42340
 .. date: 2020-11-12-21-26-31
 .. nonce: apumUL
 .. section: Documentation

 Document that in some circumstances :exc:`KeyboardInterrupt` may cause the
 code to enter an inconsistent state. Provided a sample workaround to avoid
 it if needed.

 ..

 .. bpo: 41233
 .. date: 2020-07-07-22-54-51
 .. nonce: lyUJ8L
 .. section: Documentation

 Link the errnos referenced in ``Doc/library/exceptions.rst`` to their
 respective section in ``Doc/library/errno.rst``, and vice versa. Previously
 this was only done for EINTR and InterruptedError. Patch by Yan "yyyyyyyan"
 Orestes.

 ..

 .. bpo: 38056
 .. date: 2019-09-12-08-28-17
 .. nonce: 6ktYkc
 .. section: Documentation

 Overhaul the :ref:`error-handlers` documentation in :mod:`codecs`.

 ..

 .. bpo: 13553
 .. date: 2017-12-10-19-13-39
 .. nonce: gQbZs4
 .. section: Documentation

 Document tkinter.Tk args.

 ..

 .. date: 2022-05-25-23-07-15
 .. gh-issue: 92886
 .. nonce: Aki63_
 .. section: Tests

 Fixing tests that fail when running with optimizations (``-O``) in
 ``test_imaplib.py``.

 ..

 .. date: 2022-05-12-05-51-06
 .. gh-issue: 92670
 .. nonce: 7L43Z_
 .. section: Tests

 Skip ``test_shutil.TestCopy.test_copyfile_nonexistent_dir`` test on AIX as
 the test uses a trailing slash to force the OS consider the path as a
 directory, but on AIX the trailing slash has no effect and is considered as
 a file.

 ..

 .. date: 2022-04-25-11-16-36
 .. gh-issue: 91904
 .. nonce: 13Uvrz
 .. section: Tests

 Fix initialization of :envvar:`PYTHONREGRTEST_UNICODE_GUARD` which prevented
 running regression tests on non-UTF-8 locale.

 ..

 .. date: 2022-04-16-17-54-05
 .. gh-issue: 91607
 .. nonce: FnXjtW
 .. section: Tests

 Fix ``test_concurrent_futures`` to test the correct multiprocessing start
 method context in several cases where the test logic mixed this up.

 ..

 .. bpo: 47205
 .. date: 2022-04-03-14-38-21
 .. nonce: hbbTnh
 .. section: Tests

 Skip test for :func:`~os.sched_getaffinity` and
 :func:`~os.sched_setaffinity` error case on FreeBSD.

 ..

 .. bpo: 47104
 .. date: 2022-03-23-22-45-51
 .. nonce: _esUq8
 .. section: Tests

 Rewrite :func:`asyncio.to_thread` tests to use
 :class:`unittest.IsolatedAsyncioTestCase`.

 ..

 .. bpo: 29890
 .. date: 2022-01-24-21-31-09
 .. nonce: zEG-ra
 .. section: Tests

 Add tests for :class:`ipaddress.IPv4Interface` and
 :class:`ipaddress.IPv6Interface` construction with tuple arguments. Original
 patch and tests by louisom.

 ..

 .. bpo: 47103
 .. date: 2022-03-23-20-01-16
 .. nonce: b4-00F
 .. section: Build

 Windows ``PGInstrument`` builds now copy a required DLL into the output
 directory, making it easier to run the profile stage of a PGO build.

 ..

 .. date: 2022-05-19-14-01-30
 .. gh-issue: 92984
 .. nonce: Dsxnlr
 .. section: Windows

 Explicitly disable incremental linking for non-Debug builds

 ..

 .. bpo: 47194
 .. date: 2022-04-01-14-57-40
 .. nonce: IB0XL4
 .. section: Windows

 Update ``zlib`` to v1.2.12 to resolve CVE-2018-25032.

 ..

 .. bpo: 46785
 .. date: 2022-03-13-20-35-41
 .. nonce: Pnknyl
 .. section: Windows

 Fix race condition between :func:`os.stat` and unlinking a file on Windows,
 by using errors codes returned by ``FindFirstFileW()`` when appropriate in
 ``win32_xstat_impl``.

 ..

 .. bpo: 40859
 .. date: 2020-06-04-10-42-04
 .. nonce: isKSw7
 .. section: Windows

 Update Windows build to use xz-5.2.5

 ..

 .. date: 2022-04-20-14-26-14
 .. gh-issue: 91583
 .. nonce: 200qI0
 .. section: Tools/Demos

 Fix regression in the code generated by Argument Clinic for functions with
 the ``defining_class`` parameter.
	.. date: 2022-06-01-17-47-40
	.. gh-issue: 93418
	.. nonce: 24dJuc
	.. release date: 2022-06-06
	.. section: Core and Builtins

	Fixed an assert where an f-string has an equal sign '=' following an
	expression, but there's no trailing brace. For example, f"{i=".

	..

	.. date: 2022-05-25-04-07-22
	.. gh-issue: 91924
	.. nonce: -UyO4q
	.. section: Core and Builtins

	Fix ``__ltrace__`` debug feature if the stdout encoding is not UTF-8. Patch
	by Victor Stinner.

	..

	.. date: 2022-05-22-02-37-50
	.. gh-issue: 93061
	.. nonce: r70Imp
	.. section: Core and Builtins

	Backward jumps after ``async for`` loops are no longer given dubious line
	numbers.

	..

	.. date: 2022-05-21-23-21-37
	.. gh-issue: 93065
	.. nonce: 5I18WC
	.. section: Core and Builtins

	Fix contextvars HAMT implementation to handle iteration over deep trees.

	The bug was discovered and fixed by Eli Libman. See
	`MagicStack/immutables#84
	<https://github.com/MagicStack/immutables/issues/84>`_ for more details.

	..

	.. date: 2022-05-12-09-38-20
	.. gh-issue: 92311
	.. nonce: VEgtts
	.. section: Core and Builtins

	Fixed a bug where setting ``frame.f_lineno`` to jump over a list
	comprehension could misbehave or crash.

	..

	.. date: 2022-05-01-10-58-38
	.. gh-issue: 92112
	.. nonce: lLJemu
	.. section: Core and Builtins

	Fix crash triggered by an evil custom ``mro()`` on a metaclass.

	..

	.. date: 2022-04-28-23-37-30
	.. gh-issue: 92036
	.. nonce: GZJAC9
	.. section: Core and Builtins

	Fix a crash in subinterpreters related to the garbage collector. When a
	subinterpreter is deleted, untrack all objects tracked by its GC. To prevent
	a crash in deallocator functions expecting objects to be tracked by the GC,
	leak a strong reference to these objects on purpose, so they are never
	deleted and their deallocator functions are not called. Patch by Victor
	Stinner.

	..

	.. date: 2022-04-10-22-57-27
	.. gh-issue: 91421
	.. nonce: dHhv6U
	.. section: Core and Builtins

	Fix a potential integer overflow in _Py_DecodeUTF8Ex.

	..

	.. bpo: 47212
	.. date: 2022-04-05-11-29-21
	.. nonce: leF4pz
	.. section: Core and Builtins

	Raise :exc:`IndentationError` instead of :exc:`SyntaxError` for a bare
	``except`` with no following indent. Improve :exc:`SyntaxError` locations
	for an un-parenthesized generator used as arguments. Patch by Matthieu
	Dartiailh.

	..

	.. bpo: 47182
	.. date: 2022-03-31-15-37-02
	.. nonce: e_4SsC
	.. section: Core and Builtins

	Fix a crash when using a named unicode character like ``"\N{digit nine}"``
	after the main interpreter has been initialized a second time.

	..

	.. bpo: 46775
	.. date: 2022-03-30-02-36-25
	.. nonce: e3Oxqf
	.. section: Core and Builtins

	Some Windows system error codes(>= 10000) are now mapped into the correct
	errno and may now raise a subclass of :exc:`OSError`. Patch by Dong-hee Na.

	..

	.. bpo: 47117
	.. date: 2022-03-26-15-45-57
	.. nonce: 60W6GQ
	.. section: Core and Builtins

	Fix a crash if we fail to decode characters in interactive mode if the
	tokenizer buffers are uninitialized. Patch by Pablo Galindo.

	..

	.. bpo: 39829
	.. date: 2022-03-11-09-39-01
	.. nonce: mlW3Su
	.. section: Core and Builtins

	Removed the ``__len__()`` call when initializing a list and moved
	initializing to ``list_extend``. Patch by Jeremiah Pascual.

	..

	.. bpo: 46962
	.. date: 2022-03-08-21-59-57
	.. nonce: UomDfz
	.. section: Core and Builtins

	Classes and functions that unconditionally declared their docstrings
	ignoring the `--without-doc-strings` compilation flag no longer do so.

	The classes affected are :class:`ctypes.UnionType`,
	:class:`pickle.PickleBuffer`, :class:`testcapi.RecursingInfinitelyError`,
	and :class:`types.GenericAlias`.

	The functions affected are 24 methods in :mod:`ctypes`.

	Patch by Oleg Iarygin.

	..

	.. bpo: 36819
	.. date: 2021-09-28-10-58-30
	.. nonce: cyV50C
	.. section: Core and Builtins

	Fix crashes in built-in encoders with error handlers that return position
	less or equal than the starting position of non-encodable characters.

	..

	.. date: 2022-05-26-23-10-55
	.. gh-issue: 93156
	.. nonce: 4XfDVN
	.. section: Library

	Accessing the :attr:`pathlib.PurePath.parents` sequence of an absolute path
	using negative index values produced incorrect results.

	..

	.. date: 2022-05-22-16-08-01
	.. gh-issue: 89973
	.. nonce: jc-Q4g
	.. section: Library

	Fix :exc:`re.error` raised in :mod:`fnmatch` if the pattern contains a
	character range with upper bound lower than lower bound (e.g. ``[c-a]``).
	Now such ranges are interpreted as empty ranges.

	..

	.. date: 2022-05-20-15-52-43
	.. gh-issue: 93010
	.. nonce: WF-cAc
	.. section: Library

	In a very special case, the email package tried to append the nonexistent
	``InvalidHeaderError`` to the defect list. It should have been
	``InvalidHeaderDefect``.

	..

	.. date: 2022-05-16-14-35-39
	.. gh-issue: 92839
	.. nonce: owSMyo
	.. section: Library

	Fixed crash resulting from calling bisect.insort() or bisect.insort_left()
	with the key argument not equal to None.

	..

	.. date: 2022-05-11-14-34-09
	.. gh-issue: 91581
	.. nonce: glkou2
	.. section: Library

	:meth:`~datetime.datetime.utcfromtimestamp` no longer attempts to resolve
	``fold`` in the pure Python implementation, since the fold is never 1 in
	UTC. In addition to being slightly faster in the common case, this also
	prevents some errors when the timestamp is close to :attr:`datetime.min
	<datetime.datetime.min>`. Patch by Paul Ganssle.

	..

	.. date: 2022-05-09-09-28-02
	.. gh-issue: 92530
	.. nonce: M4Q1RS
	.. section: Library

	Fix an issue that occurred after interrupting
	:func:`threading.Condition.notify`.

	..

	.. date: 2022-04-30-10-53-10
	.. gh-issue: 92049
	.. nonce: 5SEKoh
	.. section: Library

	Forbid pickling constants ``re._constants.SUCCESS`` etc. Previously,
	pickling did not fail, but the result could not be unpickled.

	..

	.. bpo: 47029
	.. date: 2022-04-26-19-01-13
	.. nonce: qkT42X
	.. section: Library

	Always close the read end of the pipe used by :class:`multiprocessing.Queue`
	after the last write of buffered data to the write end of the pipe to
	avoid :exc:`BrokenPipeError` at garbage collection and at
	:meth:`multiprocessing.Queue.close` calls. Patch by Géry Ogam.

	..

	.. date: 2022-04-26-00-10-06
	.. gh-issue: 91401
	.. nonce: mddRC8
	.. section: Library

	Provide a fail-safe way to disable :mod:`subprocess` use of ``vfork()`` via
	a private ``subprocess._USE_VFORK`` attribute. While there is currently no
	known need for this, if you find a need please only set it to ``False``.
	File a CPython issue as to why you needed it and link to that from a comment
	in your code. This attribute is documented as a footnote in 3.11.

	..

	.. date: 2022-04-25-14-18-01
	.. gh-issue: 91910
	.. nonce: kY-JR0
	.. section: Library

	Add missing f prefix to f-strings in error messages from the
	:mod:`multiprocessing` and :mod:`asyncio` modules.

	..

	.. date: 2022-04-25-10-23-01
	.. gh-issue: 91810
	.. nonce: DOHa6B
	.. section: Library

	:class:`~xml.etree.ElementTree.ElementTree` method
	:meth:`~xml.etree.ElementTree.ElementTree.write` and function
	:func:`~xml.etree.ElementTree.tostring` now use the text file's encoding
	("UTF-8" if not available) instead of locale encoding in XML declaration
	when ``encoding="unicode"`` is specified.

	..

	.. date: 2022-04-23-03-24-00
	.. gh-issue: 91832
	.. nonce: TyLi65
	.. section: Library

	Add ``required`` attribute to :class:`argparse.Action` repr output.

	..

	.. date: 2022-04-20-09-49-33
	.. gh-issue: 91734
	.. nonce: 4Dj4Gy
	.. section: Library

	Fix OSS audio support on Solaris.

	..

	.. date: 2022-04-19-17-30-17
	.. gh-issue: 91700
	.. nonce: MRJi6m
	.. section: Library

	Compilation of regular expression containing a conditional expression
	``(?(group)...)`` now raises an appropriate :exc:`re.error` if the group
	number refers to not defined group. Previously an internal RuntimeError was
	raised.

	..

	.. date: 2022-04-19-04-33-39
	.. gh-issue: 91676
	.. nonce: ceQBwh
	.. section: Library

	Fix :class:`unittest.IsolatedAsyncioTestCase` to shutdown the per test event
	loop executor before returning from its ``run`` method so that a not yet
	stopped or garbage collected executor state does not persist beyond the
	test.

	..

	.. date: 2022-04-18-16-31-33
	.. gh-issue: 90568
	.. nonce: 9kiU7o
	.. section: Library

	Parsing ``\N`` escapes of Unicode Named Character Sequences in a
	:mod:`regular expression <re>` raises now :exc:`re.error` instead of
	``TypeError``.

	..

	.. date: 2022-04-16-05-12-13
	.. gh-issue: 91595
	.. nonce: CocJBv
	.. section: Library

	Fix the comparison of character and integer inside
	:func:`Tools.gdb.libpython.write_repr`. Patch by Yu Liu.

	..

	.. date: 2022-04-15-22-07-36
	.. gh-issue: 90622
	.. nonce: 0C6l8h
	.. section: Library

	Worker processes for :class:`concurrent.futures.ProcessPoolExecutor` are no
	longer spawned on demand (a feature added in 3.9) when the multiprocessing
	context start method is ``"fork"`` as that can lead to deadlocks in the
	child processes due to a fork happening while threads are running.

	..

	.. date: 2022-04-15-18-38-21
	.. gh-issue: 91575
	.. nonce: fSyAxS
	.. section: Library

	Update case-insensitive matching in the :mod:`re` module to the latest
	Unicode version.

	..

	.. date: 2022-04-15-13-16-25
	.. gh-issue: 91581
	.. nonce: 9OGsrN
	.. section: Library

	Remove an unhandled error case in the C implementation of calls to
	:meth:`datetime.fromtimestamp <datetime.datetime.fromtimestamp>` with no
	time zone (i.e. getting a local time from an epoch timestamp). This should
	have no user-facing effect other than giving a possibly more accurate error
	message when called with timestamps that fall on 10000-01-01 in the local
	time. Patch by Paul Ganssle.

	..

	.. bpo: 47260
	.. date: 2022-04-08-14-30-53
	.. nonce: TtcNxI
	.. section: Library

	Fix ``os.closerange()`` potentially being a no-op in a Linux seccomp
	sandbox.

	..

	.. bpo: 39064
	.. date: 2022-04-03-19-40-09
	.. nonce: 76PbIz
	.. section: Library

	:class:`zipfile.ZipFile` now raises :exc:`zipfile.BadZipFile` instead of
	``ValueError`` when reading a corrupt zip file in which the central
	directory offset is negative.

	..

	.. bpo: 47151
	.. date: 2022-03-30-01-17-43
	.. nonce: z-nQkR
	.. section: Library

	When subprocess tries to use vfork, it now falls back to fork if vfork
	returns an error. This allows use in situations where vfork isn't allowed by
	the OS kernel.

	..

	.. bpo: 27929
	.. date: 2022-03-28-13-35-50
	.. nonce: j5mAmV
	.. section: Library

	Fix :meth:`asyncio.loop.sock_connect` to only resolve names for
	:const:`socket.AF_INET` or :const:`socket.AF_INET6` families. Resolution may
	not make sense for other families, like :const:`socket.AF_BLUETOOTH` and
	:const:`socket.AF_UNIX`.

	..

	.. bpo: 43323
	.. date: 2022-03-27-12-40-16
	.. nonce: 9mFPuI
	.. section: Library

	Fix errors in the :mod:`email` module if the charset itself contains
	undecodable/unencodable characters.

	..

	.. bpo: 47101
	.. date: 2022-03-23-15-31-02
	.. nonce: rVSld-
	.. section: Library

	:const:`hashlib.algorithms_available` now lists only algorithms that are
	provided by activated crypto providers on OpenSSL 3.0. Legacy algorithms are
	not listed unless the legacy provider has been loaded into the default OSSL
	context.

	..

	.. bpo: 46787
	.. date: 2022-02-18-20-09-29
	.. nonce: juwWc0
	.. section: Library

	Fix :class:`concurrent.futures.ProcessPoolExecutor` exception memory leak

	..

	.. bpo: 45393
	.. date: 2022-02-09-23-44-27
	.. nonce: 9v5Y8U
	.. section: Library

	Fix the formatting for ``await x`` and ``not x`` in the operator precedence
	table when using the :func:`help` system.

	..

	.. bpo: 46415
	.. date: 2022-01-17-16-53-30
	.. nonce: 6wSYg-
	.. section: Library

	Fix ipaddress.ip_{address,interface,network} raising TypeError instead of
	ValueError if given invalid tuple as address parameter.

	..

	.. bpo: 28249
	.. date: 2022-01-09-14-23-00
	.. nonce: 4dzB80
	.. section: Library

	Set :attr:`doctest.DocTest.lineno` to ``None`` when object does not have
	:attr:`__doc__`.

	..

	.. bpo: 45138
	.. date: 2021-09-08-16-21-03
	.. nonce: yghUrK
	.. section: Library

	Fix a regression in the :mod:`sqlite3` trace callback where bound parameters
	were not expanded in the passed statement string. The regression was
	introduced in Python 3.10 by :issue:`40318`. Patch by Erlend E. Aasland.

	..

	.. bpo: 44493
	.. date: 2021-07-26-10-46-49
	.. nonce: xp3CRH
	.. section: Library

	Add missing terminated NUL in sockaddr_un's length

	This was potentially observable when using non-abstract AF_UNIX datagram
	sockets to processes written in another programming language.

	..

	.. bpo: 42627
	.. date: 2021-05-22-07-58-59
	.. nonce: EejtD0
	.. section: Library

	Fix incorrect parsing of Windows registry proxy settings

	..

	.. bpo: 36073
	.. date: 2019-06-22-11-01-45
	.. nonce: ED8mB9
	.. section: Library

	Raise :exc:`~sqlite3.ProgrammingError` instead of segfaulting on recursive
	usage of cursors in :mod:`sqlite3` converters. Patch by Sergey Fedoseev.

	..

	.. date: 2022-05-26-11-33-23
	.. gh-issue: 86438
	.. nonce: kEGGmK
	.. section: Documentation

	Clarify that :option:`-W` and :envvar:`PYTHONWARNINGS` are matched literally
	and case-insensitively, rather than as regular expressions, in
	:mod:`warnings`.

	..

	.. date: 2022-05-18-23-58-26
	.. gh-issue: 92240
	.. nonce: bHvYiz
	.. section: Documentation

	Added release dates for "What's New in Python 3.X" for 3.0, 3.1, 3.2, 3.8
	and 3.10

	..

	.. date: 2022-04-24-22-09-31
	.. gh-issue: 91888
	.. nonce: kTjJLx
	.. section: Documentation

	Add a new ``gh`` role to the documentation to link to GitHub issues.

	..

	.. date: 2022-04-23-00-22-54
	.. gh-issue: 91783
	.. nonce: N09dRR
	.. section: Documentation

	Document security issues concerning the use of the function
	:meth:`shutil.unpack_archive`

	..

	.. date: 2022-04-19-20-16-00
	.. gh-issue: 91547
	.. nonce: LsNWER
	.. section: Documentation

	Remove "Undocumented modules" page.

	..

	.. bpo: 44347
	.. date: 2022-04-10-20-28-20
	.. nonce: Q1m3DM
	.. section: Documentation

	Clarify the meaning of dirs_exist_ok, a kwarg of :func:`shutil.copytree`.

	..

	.. bpo: 38668
	.. date: 2022-04-01-09-28-31
	.. nonce: j4mrqW
	.. section: Documentation

	Update the introduction to documentation for :mod:`os.path` to remove
	warnings that became irrelevant after the implementations of :pep:`383` and
	:pep:`529`.

	..

	.. bpo: 47138
	.. date: 2022-03-28-12-29-42
	.. nonce: 2B4N-k
	.. section: Documentation

	Pin Jinja to a version compatible with Sphinx version 3.2.1.

	..

	.. bpo: 46962
	.. date: 2022-03-08-22-10-38
	.. nonce: FIVe9I
	.. section: Documentation

	All docstrings in code snippets are now wrapped into :func:`PyDoc_STR` to
	follow the guideline of `PEP 7's Documentation Strings paragraph
	<https://www.python.org/dev/peps/pep-0007/#documentation-strings>`_. Patch
	by Oleg Iarygin.

	..

	.. bpo: 26792
	.. date: 2022-01-23-20-44-53
	.. nonce: dQ1v1W
	.. section: Documentation

	Improve the docstrings of :func:`runpy.run_module` and
	:func:`runpy.run_path`. Original patch by Andrew Brezovsky.

	..

	.. bpo: 40838
	.. date: 2022-01-13-16-03-15
	.. nonce: k3NVCf
	.. section: Documentation

	Document that :func:`inspect.getdoc`, :func:`inspect.getmodule`, and
	:func:`inspect.getsourcefile` might return ``None``.

	..

	.. bpo: 45790
	.. date: 2021-11-12-11-03-55
	.. nonce: 6yuhe8
	.. section: Documentation

	Adjust inaccurate phrasing in :doc:`../extending/newtypes_tutorial` about
	the ``ob_base`` field and the macros used to access its contents.

	..

	.. bpo: 42340
	.. date: 2020-11-12-21-26-31
	.. nonce: apumUL
	.. section: Documentation

	Document that in some circumstances :exc:`KeyboardInterrupt` may cause the
	code to enter an inconsistent state. Provided a sample workaround to avoid
	it if needed.

	..

	.. bpo: 41233
	.. date: 2020-07-07-22-54-51
	.. nonce: lyUJ8L
	.. section: Documentation

	Link the errnos referenced in ``Doc/library/exceptions.rst`` to their
	respective section in ``Doc/library/errno.rst``, and vice versa. Previously
	this was only done for EINTR and InterruptedError. Patch by Yan "yyyyyyyan"
	Orestes.

	..

	.. bpo: 38056
	.. date: 2019-09-12-08-28-17
	.. nonce: 6ktYkc
	.. section: Documentation

	Overhaul the :ref:`error-handlers` documentation in :mod:`codecs`.

	..

	.. bpo: 13553
	.. date: 2017-12-10-19-13-39
	.. nonce: gQbZs4
	.. section: Documentation

	Document tkinter.Tk args.

	..

	.. date: 2022-05-25-23-07-15
	.. gh-issue: 92886
	.. nonce: Aki63_
	.. section: Tests

	Fixing tests that fail when running with optimizations (``-O``) in
	``test_imaplib.py``.

	..

	.. date: 2022-05-12-05-51-06
	.. gh-issue: 92670
	.. nonce: 7L43Z_
	.. section: Tests

	Skip ``test_shutil.TestCopy.test_copyfile_nonexistent_dir`` test on AIX as
	the test uses a trailing slash to force the OS consider the path as a
	directory, but on AIX the trailing slash has no effect and is considered as
	a file.

	..

	.. date: 2022-04-25-11-16-36
	.. gh-issue: 91904
	.. nonce: 13Uvrz
	.. section: Tests

	Fix initialization of :envvar:`PYTHONREGRTEST_UNICODE_GUARD` which prevented
	running regression tests on non-UTF-8 locale.

	..

	.. date: 2022-04-16-17-54-05
	.. gh-issue: 91607
	.. nonce: FnXjtW
	.. section: Tests

	Fix ``test_concurrent_futures`` to test the correct multiprocessing start
	method context in several cases where the test logic mixed this up.

	..

	.. bpo: 47205
	.. date: 2022-04-03-14-38-21
	.. nonce: hbbTnh
	.. section: Tests

	Skip test for :func:`~os.sched_getaffinity` and
	:func:`~os.sched_setaffinity` error case on FreeBSD.

	..

	.. bpo: 47104
	.. date: 2022-03-23-22-45-51
	.. nonce: _esUq8
	.. section: Tests

	Rewrite :func:`asyncio.to_thread` tests to use
	:class:`unittest.IsolatedAsyncioTestCase`.

	..

	.. bpo: 29890
	.. date: 2022-01-24-21-31-09
	.. nonce: zEG-ra
	.. section: Tests

	Add tests for :class:`ipaddress.IPv4Interface` and
	:class:`ipaddress.IPv6Interface` construction with tuple arguments. Original
	patch and tests by louisom.

	..

	.. bpo: 47103
	.. date: 2022-03-23-20-01-16
	.. nonce: b4-00F
	.. section: Build

	Windows ``PGInstrument`` builds now copy a required DLL into the output
	directory, making it easier to run the profile stage of a PGO build.

	..

	.. date: 2022-05-19-14-01-30
	.. gh-issue: 92984
	.. nonce: Dsxnlr
	.. section: Windows

	Explicitly disable incremental linking for non-Debug builds

	..

	.. bpo: 47194
	.. date: 2022-04-01-14-57-40
	.. nonce: IB0XL4
	.. section: Windows

	Update ``zlib`` to v1.2.12 to resolve CVE-2018-25032.

	..

	.. bpo: 46785
	.. date: 2022-03-13-20-35-41
	.. nonce: Pnknyl
	.. section: Windows

	Fix race condition between :func:`os.stat` and unlinking a file on Windows,
	by using errors codes returned by ``FindFirstFileW()`` when appropriate in
	``win32_xstat_impl``.

	..

	.. bpo: 40859
	.. date: 2020-06-04-10-42-04
	.. nonce: isKSw7
	.. section: Windows

	Update Windows build to use xz-5.2.5

	..

	.. date: 2022-04-20-14-26-14
	.. gh-issue: 91583
	.. nonce: 200qI0
	.. section: Tools/Demos

	Fix regression in the code generated by Argument Clinic for functions with
	the ``defining_class`` parameter.