cpython/Misc/NEWS.d/3.14.1.rst

.. date: 2025-10-08-22-54-38
.. gh-issue: 139810
.. nonce: LAaemi
.. release date: 2025-12-02
.. section: Windows

Installing with ``py install 3[.x]-dev`` will now select final versions as
well as prereleases.

..

.. date: 2025-11-18-13-55-47
.. gh-issue: 141692
.. nonce: tud9if
.. section: Tools/Demos

Each slice of an iOS XCframework now contains a ``lib`` folder that contains
a symlink to the libpython dylib. This allows binary modules to be compiled
for iOS using dynamic libreary linking, rather than Framework linking.

..

.. date: 2025-11-12-12-54-28
.. gh-issue: 141442
.. nonce: 50dS3P
.. section: Tools/Demos

The iOS testbed now correctly handles test arguments that contain spaces.

..

.. date: 2025-10-29-15-20-19
.. gh-issue: 140702
.. nonce: ZXtW8h
.. section: Tools/Demos

The iOS testbed app will now expose the ``GITHUB_ACTIONS`` environment
variable to iOS apps being tested.

..

.. date: 2025-08-06-11-54-55
.. gh-issue: 137484
.. nonce: 8iFAQs
.. section: Tools/Demos

Have ``Tools/wasm/wasi`` put the build Python into a directory named after
the build triple instead of "build".

..

.. date: 2025-07-30-11-15-47
.. gh-issue: 137248
.. nonce: 8IxwY3
.. section: Tools/Demos

Add a ``--logdir`` option to ``Tools/wasm/wasi`` for specifying where to
write log files.

..

.. date: 2025-07-30-10-28-35
.. gh-issue: 137243
.. nonce: NkdUqH
.. section: Tools/Demos

Have Tools/wasm/wasi detect a WASI SDK install in /opt when it was directly
extracted from a release tarball.

..

.. date: 2025-10-23-16-39-49
.. gh-issue: 140482
.. nonce: ZMtyeD
.. section: Tests

Preserve and restore the state of ``stty echo`` as part of the test
environment.

..

.. date: 2025-10-15-00-52-12
.. gh-issue: 140082
.. nonce: fpET50
.. section: Tests

Update ``python -m test`` to set ``FORCE_COLOR=1`` when being run with color
enabled so that :mod:`unittest` which is run by it with redirected output
will output in color.

..

.. date: 2025-09-22-15-40-09
.. gh-issue: 139208
.. nonce: Tc13dl
.. section: Tests

Fix regrtest ``--fast-ci --verbose``: don't ignore the ``--verbose`` option
anymore. Patch by Victor Stinner.

..

.. date: 2025-07-09-21-45-51
.. gh-issue: 136442
.. nonce: jlbklP
.. section: Tests

Use exitcode ``1`` instead of ``5`` if :func:`unittest.TestCase.setUpClass`
raises an exception

..

.. date: 2025-10-07-19-31-34
.. gh-issue: 139700
.. nonce: vNHU1O
.. section: Security

Check consistency of the zip64 end of central directory record. Support
records with "zip64 extensible data" if there are no bytes prepended to the
ZIP file.

..

.. date: 2025-09-24-13-39-56
.. gh-issue: 139283
.. nonce: jODz_q
.. section: Security

:mod:`sqlite3`: correctly handle maximum number of rows to fetch in
:meth:`Cursor.fetchmany <sqlite3.Cursor.fetchmany>` and reject negative
values for :attr:`Cursor.arraysize <sqlite3.Cursor.arraysize>`. Patch by
Bénédikt Tran.

..

.. date: 2025-08-15-23-08-44
.. gh-issue: 137836
.. nonce: b55rhh
.. section: Security

Add support of the "plaintext" element, RAWTEXT elements "xmp", "iframe",
"noembed" and "noframes", and optionally RAWTEXT element "noscript" in
:class:`html.parser.HTMLParser`.

..

.. date: 2025-06-28-13-23-53
.. gh-issue: 136063
.. nonce: aGk0Jv
.. section: Security

:mod:`email.message`: ensure linear complexity for legacy HTTP parameters
parsing. Patch by Bénédikt Tran.

..

.. date: 2025-05-30-22-33-27
.. gh-issue: 136065
.. nonce: bu337o
.. section: Security

Fix quadratic complexity in :func:`os.path.expandvars`.

..

.. date: 2024-05-23-11-47-48
.. gh-issue: 119451
.. nonce: qkJe9-
.. section: Security

Fix a potential memory denial of service in the :mod:`http.client` module.
When connecting to a malicious server, it could cause an arbitrary amount of
memory to be allocated. This could have led to symptoms including a
:exc:`MemoryError`, swapping, out of memory (OOM) killed processes or
containers, or even system crashes.

..

.. date: 2024-05-21-22-11-31
.. gh-issue: 119342
.. nonce: BTFj4Z
.. section: Security

Fix a potential memory denial of service in the :mod:`plistlib` module. When
reading a Plist file received from untrusted source, it could cause an
arbitrary amount of memory to be allocated. This could have led to symptoms
including a :exc:`MemoryError`, swapping, out of memory (OOM) killed
processes or containers, or even system crashes.

..

.. date: 2025-11-29-04-20-44
.. gh-issue: 74389
.. nonce: pW3URj
.. section: Library

When the stdin being used by a :class:`subprocess.Popen` instance is closed,
this is now ignored in :meth:`subprocess.Popen.communicate` instead of
leaving the class in an inconsistent state.

..

.. date: 2025-11-29-03-02-45
.. gh-issue: 87512
.. nonce: bn4xbm
.. section: Library

Fix :func:`subprocess.Popen.communicate` timeout handling on Windows when
writing large input. Previously, the timeout was ignored during stdin
writing, causing the method to block indefinitely if the child process did
not consume input quickly. The stdin write is now performed in a background
thread, allowing the timeout to be properly enforced.

..

.. date: 2025-11-27-20-16-38
.. gh-issue: 141473
.. nonce: Wq4xVN
.. section: Library

When :meth:`subprocess.Popen.communicate` was called with *input* and a
*timeout* and is called for a second time after a
:exc:`~subprocess.TimeoutExpired` exception before the process has died, it
should no longer hang.

..

.. date: 2025-11-25-16-00-29
.. gh-issue: 59000
.. nonce: YtOyJy
.. section: Library

Fix :mod:`pdb` breakpoint resolution for class methods when the module
defining the class is not imported.

..

.. date: 2025-11-18-14-39-31
.. gh-issue: 141570
.. nonce: q3n984
.. section: Library

Support :term:`file-like object` raising :exc:`OSError` from
:meth:`~io.IOBase.fileno` in color detection (``_colorize.can_colorize()``).
This can occur when ``sys.stdout`` is redirected.

..

.. date: 2025-11-17-08-16-30
.. gh-issue: 141659
.. nonce: QNi9Aj
.. section: Library

Fix bad file descriptor errors from ``_posixsubprocess`` on AIX.

..

.. date: 2025-11-15-14-58-12
.. gh-issue: 141600
.. nonce: XY2BXg
.. section: Library

Fix musl version detection on Void Linux.

..

.. date: 2025-11-14-16-24-20
.. gh-issue: 141497
.. nonce: L_CxDJ
.. section: Library

:mod:`ipaddress`: ensure that the methods :meth:`IPv4Network.hosts()
<ipaddress.IPv4Network.hosts>` and :meth:`IPv6Network.hosts()
<ipaddress.IPv6Network.hosts>` always return an iterator.

..

.. date: 2025-11-13-14-51-30
.. gh-issue: 140938
.. nonce: kXsHHv
.. section: Library

The :func:`statistics.stdev` and :func:`statistics.pstdev` functions now
raise a :exc:`ValueError` when the input contains an infinity or a NaN.

..

.. date: 2025-11-12-15-42-47
.. gh-issue: 124111
.. nonce: hTw4OE
.. section: Library

Updated Tcl threading configuration in :mod:`_tkinter` to assume that
threads are always available in Tcl 9 and later.

..

.. date: 2025-11-12-01-49-03
.. gh-issue: 137109
.. nonce: D6sq2B
.. section: Library

The :mod:`os.fork` and related forking APIs will no longer warn in the
common case where Linux or macOS platform APIs return the number of threads
in a process and find the answer to be 1 even when a
:func:`os.register_at_fork` ``after_in_parent=`` callback (re)starts a
thread.

..

.. date: 2025-11-10-01-47-18
.. gh-issue: 141314
.. nonce: baaa28
.. section: Library

Fix assertion failure in :meth:`io.TextIOWrapper.tell` when reading files
with standalone carriage return (``\r``) line endings.

..

.. date: 2025-11-09-18-55-13
.. gh-issue: 141311
.. nonce: qZ3swc
.. section: Library

Fix assertion failure in :func:`!io.BytesIO.readinto` and undefined behavior
arising when read position is above capcity in :class:`io.BytesIO`.

..

.. date: 2025-11-06-15-11-50
.. gh-issue: 141141
.. nonce: tgIfgH
.. section: Library

Fix a thread safety issue with :func:`base64.b85decode`. Contributed by
Benel Tayar.

..

.. date: 2025-11-04-15-40-35
.. gh-issue: 137969
.. nonce: 9VZQVt
.. section: Library

Fix :meth:`annotationlib.ForwardRef.evaluate` returning
:class:`~annotationlib.ForwardRef` objects which don't update with new
globals.

..

.. date: 2025-11-03-17-13-00
.. gh-issue: 140911
.. nonce: 7KFvSQ
.. section: Library

:mod:`collections`: Ensure that the methods ``UserString.rindex()`` and
``UserString.index()`` accept :class:`collections.UserString` instances as
the sub argument.

..

.. date: 2025-11-03-16-23-54
.. gh-issue: 140797
.. nonce: DuFEeR
.. section: Library

The undocumented :class:`!re.Scanner` class now forbids regular expressions
containing capturing groups in its lexicon patterns. Patterns using
capturing groups could previously lead to crashes with segmentation fault.
Use non-capturing groups (?:...) instead.

..

.. date: 2025-11-03-05-38-31
.. gh-issue: 125115
.. nonce: jGS8MN
.. section: Library

Refactor the :mod:`pdb` parsing issue so positional arguments can pass
through intuitively.

..

.. date: 2025-11-02-19-23-32
.. gh-issue: 140815
.. nonce: McEG-T
.. section: Library

:mod:`faulthandler` now detects if a frame or a code object is invalid or
freed. Patch by Victor Stinner.

..

.. date: 2025-11-02-11-46-00
.. gh-issue: 100218
.. nonce: 9Ezfdq
.. section: Library

Correctly set :attr:`~OSError.errno` when :func:`socket.if_nametoindex` or
:func:`socket.if_indextoname` raise an :exc:`OSError`. Patch by Bénédikt
Tran.

..

.. date: 2025-11-02-10-44-23
.. gh-issue: 140875
.. nonce: wt6B37
.. section: Library

Fix handling of unclosed character references (named and numerical) followed
by the end of file in :class:`html.parser.HTMLParser` with
``convert_charrefs=False``.

..

.. date: 2025-11-02-09-37-22
.. gh-issue: 140734
.. nonce: f8gST9
.. section: Library

:mod:`multiprocessing`: fix off-by-one error when checking the length of a
temporary socket file path. Patch by Bénédikt Tran.

..

.. date: 2025-11-01-00-36-14
.. gh-issue: 140874
.. nonce: eAWt3K
.. section: Library

Bump the version of pip bundled in ensurepip to version 25.3

..

.. date: 2025-10-31-15-06-26
.. gh-issue: 140691
.. nonce: JzHGtg
.. section: Library

In :mod:`urllib.request`, when opening a FTP URL fails because a data
connection cannot be made, the control connection's socket is now closed to
avoid a :exc:`ResourceWarning`.

..

.. date: 2025-10-31-13-57-55
.. gh-issue: 103847
.. nonce: VM7TnW
.. section: Library

Fix hang when cancelling process created by
:func:`asyncio.create_subprocess_exec` or
:func:`asyncio.create_subprocess_shell`. Patch by Kumar Aditya.

..

.. date: 2025-10-29-16-12-41
.. gh-issue: 120057
.. nonce: qGj5Dl
.. section: Library

Add :func:`os.reload_environ` to ``os.__all__``.

..

.. date: 2025-10-28-17-43-51
.. gh-issue: 140228
.. nonce: 8kfHhO
.. section: Library

Avoid making unnecessary filesystem calls for frozen modules in
:mod:`linecache` when the global module cache is not present.

..

.. date: 2025-10-27-18-29-42
.. gh-issue: 140590
.. nonce: LT9HHn
.. section: Library

Fix arguments checking for the :meth:`!functools.partial.__setstate__` that
may lead to internal state corruption and crash. Patch by Sergey Miryanov.

..

.. date: 2025-10-27-16-01-41
.. gh-issue: 125434
.. nonce: qy0uRA
.. section: Library

Display thread name in :mod:`faulthandler` on Windows. Patch by Victor
Stinner.

..

.. date: 2025-10-27-13-49-31
.. gh-issue: 140634
.. nonce: ULng9G
.. section: Library

Fix a reference counting bug in :meth:`!os.sched_param.__reduce__`.

..

.. date: 2025-10-26-16-24-12
.. gh-issue: 140633
.. nonce: ioayC1
.. section: Library

Ignore :exc:`AttributeError` when setting a module's ``__file__`` attribute
when loading an extension module packaged as Apple Framework.

..

.. date: 2025-10-25-21-26-16
.. gh-issue: 140593
.. nonce: OxlLc9
.. section: Library

:mod:`xml.parsers.expat`: Fix a memory leak that could affect users with
:meth:`~xml.parsers.expat.xmlparser.ElementDeclHandler` set to a custom
element declaration handler. Patch by Sebastian Pipping.

..

.. date: 2025-10-25-21-04-00
.. gh-issue: 140607
.. nonce: oOZGxS
.. section: Library

Inside :meth:`io.RawIOBase.read`, validate that the count of bytes returned
by :meth:`io.RawIOBase.readinto` is valid (inside the provided buffer).

..

.. date: 2025-10-23-19-39-16
.. gh-issue: 138162
.. nonce: Znw5DN
.. section: Library

Fix :class:`logging.LoggerAdapter` with ``merge_extra=True`` and without the
*extra* argument.

..

.. date: 2025-10-23-12-12-22
.. gh-issue: 138774
.. nonce: mnh2gU
.. section: Library

:func:`ast.unparse` now generates full source code when handling
:class:`ast.Interpolation` nodes that do not have a specified source.

..

.. date: 2025-10-22-20-52-13
.. gh-issue: 140474
.. nonce: xIWlip
.. section: Library

Fix memory leak in :class:`array.array` when creating arrays from an empty
:class:`str` and the ``u`` type code.

..

.. date: 2025-10-21-15-54-13
.. gh-issue: 137530
.. nonce: ZyIVUH
.. section: Library

:mod:`dataclasses` Fix annotations for generated ``__init__`` methods by
replacing the annotations that were in-line in the generated source code
with ``__annotate__`` functions attached to the methods.

..

.. date: 2025-10-20-12-33-49
.. gh-issue: 140348
.. nonce: SAKnQZ
.. section: Library

Fix regression in Python 3.14.0 where using the ``|`` operator on a
:class:`typing.Union` object combined with an object that is not a type
would raise an error.

..

.. date: 2025-10-17-23-58-11
.. gh-issue: 140272
.. nonce: lhY8uS
.. section: Library

Fix memory leak in the :meth:`!clear` method of the :mod:`dbm.gnu` database.

..

.. date: 2025-10-15-21-42-13
.. gh-issue: 140041
.. nonce: _Fka2j
.. section: Library

Fix import of :mod:`ctypes` on Android and Cygwin when ABI flags are
present.

..

.. date: 2025-10-15-20-47-04
.. gh-issue: 140120
.. nonce: 3gffZq
.. section: Library

Fixed a memory leak in :mod:`hmac` when it was using the hacl-star backend.
Discovered by ``@ashm-dev`` using AddressSanitizer.

..

.. date: 2025-10-11-10-02-56
.. gh-issue: 139905
.. nonce: UyJIR_
.. section: Library

Add suggestion to error message for :class:`typing.Generic` subclasses when
``cls.__parameters__`` is missing due to a parent class failing to call
:meth:`super().__init_subclass__() <object.__init_subclass__>` in its
``__init_subclass__``.

..

.. date: 2025-10-10-11-22-50
.. gh-issue: 139894
.. nonce: ECAXqj
.. section: Library

Fix incorrect sharing of current task with the child process while forking
in :mod:`asyncio`. Patch by Kumar Aditya.

..

.. date: 2025-10-09-21-37-20
.. gh-issue: 139845
.. nonce: dzx5UP
.. section: Library

Fix to not print KeyboardInterrupt twice in default asyncio REPL.

..

.. date: 2025-10-09-13-48-28
.. gh-issue: 139783
.. nonce: __NUgo
.. section: Library

Fix :func:`inspect.getsourcelines` for the case when a decorator is followed
by a comment or an empty line.

..

.. date: 2025-10-09-03-06-19
.. gh-issue: 139809
.. nonce: lzHJNu
.. section: Library

Prevent premature colorization of subparser ``prog`` in
:meth:`argparse.ArgumentParser.add_subparsers` to respect color environment
variable changes after parser creation.

..

.. date: 2025-10-08-00-06-30
.. gh-issue: 139736
.. nonce: baPeBd
.. section: Library

Fix excessive indentation in the default :mod:`argparse`
:class:`!HelpFormatter`. Patch by Alexander Edland.

..

.. date: 2025-10-02-17-40-10
.. gh-issue: 70765
.. nonce: zVlLZn
.. section: Library

:mod:`http.server`: fix default handling of HTTP/0.9 requests in
:class:`~http.server.BaseHTTPRequestHandler`. Previously,
:meth:`!BaseHTTPRequestHandler.parse_request` incorrectly waited for headers
in the request although those are not supported in HTTP/0.9. Patch by
Bénédikt Tran.

..

.. date: 2025-09-30-12-52-54
.. gh-issue: 63161
.. nonce: mECM1A
.. section: Library

Fix :func:`tokenize.detect_encoding`. Support non-UTF-8 shebang and comments
if non-UTF-8 encoding is specified. Detect decoding error for non-UTF-8
encoding. Detect null bytes in source code.

..

.. date: 2025-09-28-16-34-11
.. gh-issue: 139391
.. nonce: nRFnmx
.. section: Library

Fix an issue when, on non-Windows platforms, it was not possible to
gracefully exit a ``python -m asyncio`` process suspended by Ctrl+Z and
later resumed by :manpage:`fg` other than with :manpage:`kill`.

..

.. date: 2025-09-25-20-16-10
.. gh-issue: 101828
.. nonce: yTxJlJ
.. section: Library

Fix ``'shift_jisx0213'``, ``'shift_jis_2004'``, ``'euc_jisx0213'`` and
``'euc_jis_2004'`` codecs truncating null chars as they were treated as part
of multi-character sequences.

..

.. date: 2025-09-24-14-17-34
.. gh-issue: 139289
.. nonce: Vmk25k
.. section: Library

Do a real lazy-import on :mod:`rlcompleter` in :mod:`pdb` and restore the
existing completer after importing :mod:`rlcompleter`.

..

.. date: 2025-09-23-09-46-46
.. gh-issue: 139246
.. nonce: pzfM-w
.. section: Library

fix: paste zero-width in default repl width is wrong.

..

.. date: 2025-09-22-14-40-11
.. gh-issue: 90949
.. nonce: UM35nb
.. section: Library

Add :meth:`~xml.parsers.expat.xmlparser.SetAllocTrackerActivationThreshold`
and :meth:`~xml.parsers.expat.xmlparser.SetAllocTrackerMaximumAmplification`
to :ref:`xmlparser <xmlparser-objects>` objects to prevent use of
disproportional amounts of dynamic memory from within an Expat parser. Patch
by Bénédikt Tran.

..

.. date: 2025-09-21-15-58-57
.. gh-issue: 139210
.. nonce: HGbMvz
.. section: Library

Fix use-after-free when reporting unknown event in
:func:`xml.etree.ElementTree.iterparse`. Patch by Ken Jin.

..

.. date: 2025-09-20-17-50-31
.. gh-issue: 138860
.. nonce: Y9JXap
.. section: Library

Lazy import :mod:`rlcompleter` in :mod:`pdb` to avoid deadlock in
subprocess.

..

.. date: 2025-09-19-09-36-42
.. gh-issue: 112729
.. nonce: mmty0_
.. section: Library

Fix crash when calling :func:`concurrent.interpreters.create` when the
process is out of memory.

..

.. date: 2025-09-18-05-32-18
.. gh-issue: 135729
.. nonce: 8AmMza
.. section: Library

Fix unraisable exception during finalization when using
:mod:`concurrent.interpreters` in the REPL.

..

.. date: 2025-09-17-21-54-53
.. gh-issue: 139076
.. nonce: 2eX9lG
.. section: Library

Fix a bug in the :mod:`pydoc` module that was hiding functions in a Python
module if they were implemented in an extension module and the module did
not have ``__all__``.

..

.. date: 2025-09-17-19-08-34
.. gh-issue: 139065
.. nonce: Hu8fM5
.. section: Library

Fix trailing space before a wrapped long word if the line length is exactly
*width* in :mod:`textwrap`.

..

.. date: 2025-09-17-12-07-21
.. gh-issue: 139001
.. nonce: O6tseN
.. section: Library

Fix race condition in :class:`pathlib.Path` on the internal ``_raw_paths``
field.

..

.. date: 2025-09-17-08-32-43
.. gh-issue: 138813
.. nonce: LHkHjX
.. section: Library

:class:`!multiprocessing.BaseProcess` defaults ``kwargs`` to ``None``
instead of a shared dictionary.

..

.. date: 2025-09-16-16-46-58
.. gh-issue: 138993
.. nonce: -8s8_T
.. section: Library

Dedent :data:`credits` text.

..

.. date: 2025-09-15-21-03-11
.. gh-issue: 138891
.. nonce: oZFdtR
.. section: Library

Fix ``SyntaxError`` when ``inspect.get_annotations(f, eval_str=True)`` is
called on a function annotated with a :pep:`646` ``star_expression``

..

.. date: 2025-09-15-19-29-12
.. gh-issue: 130567
.. nonce: shDEnT
.. section: Library

Fix possible crash in :func:`locale.strxfrm` due to a platform bug on macOS.

..

.. date: 2025-09-13-12-19-17
.. gh-issue: 138859
.. nonce: PxjIoN
.. section: Library

Fix generic type parameterization raising a :exc:`TypeError` when omitting a
:class:`ParamSpec` that has a default which is not a list of types.

..

.. date: 2025-09-12-09-34-37
.. gh-issue: 138764
.. nonce: mokHoY
.. section: Library

Prevent :func:`annotationlib.call_annotate_function` from calling
``__annotate__`` functions that don't support ``VALUE_WITH_FAKE_GLOBALS`` in
a fake globals namespace with empty globals.

Make ``FORWARDREF`` and ``STRING`` annotations fall back to using ``VALUE``
annotations in the case that neither their own format, nor
``VALUE_WITH_FAKE_GLOBALS`` are supported.

..

.. date: 2025-09-11-15-03-37
.. gh-issue: 138775
.. nonce: w7rnSx
.. section: Library

Use of ``python -m`` with :mod:`base64` has been fixed to detect input from
a terminal so that it properly notices EOF.

..

.. date: 2025-09-11-11-09-28
.. gh-issue: 138779
.. nonce: TNZnLr
.. section: Library

Support device numbers larger than ``2**63-1`` for the
:attr:`~os.stat_result.st_rdev` field of the :class:`os.stat_result`
structure.

..

.. date: 2025-09-05-21-10-24
.. gh-issue: 137706
.. nonce: 0EztiJ
.. section: Library

Fix the partial evaluation of annotations that use ``typing.Annotated[T,
x]`` where ``T`` is a forward reference.

..

.. date: 2025-09-05-15-35-59
.. gh-issue: 88375
.. nonce: dC491a
.. section: Library

Fix normalization of the ``robots.txt`` rules and URLs in the
:mod:`urllib.robotparser` module. No longer ignore trailing ``?``.
Distinguish raw special characters ``?``, ``=`` and ``&`` from the
percent-encoded ones.

..

.. date: 2025-09-04-15-18-11
.. gh-issue: 111788
.. nonce: tuTEM5
.. section: Library

Fix parsing errors in the :mod:`urllib.robotparser` module. Don't fail
trying to parse weird paths. Don't fail trying to decode non-UTF-8
``robots.txt`` files.

..

.. date: 2025-09-03-20-18-39
.. gh-issue: 98896
.. nonce: tjez89
.. section: Library

Fix a failure in multiprocessing resource_tracker when SharedMemory names
contain colons. Patch by Rani Pinchuk.

..

.. date: 2025-09-03-18-26-07
.. gh-issue: 138425
.. nonce: cVE9Ho
.. section: Library

Fix partial evaluation of :class:`annotationlib.ForwardRef` objects which
rely on names defined as globals.

..

.. date: 2025-09-03-15-20-10
.. gh-issue: 138432
.. nonce: RMc7UX
.. section: Library

:meth:`zoneinfo.reset_tzpath` will now convert any :class:`os.PathLike`
objects it receives into strings before adding them to ``TZPATH``. It will
raise ``TypeError`` if anything other than a string is found after this
conversion. If given an :class:`os.PathLike` object that represents a
relative path, it will now raise ``ValueError`` instead of ``TypeError``,
and present a more informative error message.

..

.. date: 2025-08-31-09-06-49
.. gh-issue: 138008
.. nonce: heOvsU
.. section: Library

Fix segmentation faults in the :mod:`ctypes` module due to invalid
:attr:`~ctypes._CFuncPtr.argtypes`. Patch by Dung Nguyen.

..

.. date: 2025-08-30-10-04-28
.. gh-issue: 60462
.. nonce: yh_vDc
.. section: Library

Fix :func:`locale.strxfrm` on Solaris (and possibly other platforms).

..

.. date: 2025-08-29-12-56-55
.. gh-issue: 138239
.. nonce: uthZFI
.. section: Library

The REPL now highlights :keyword:`type` as a soft keyword in :ref:`type
statements <type>`.

..

.. date: 2025-08-28-13-20-09
.. gh-issue: 138204
.. nonce: 8oLOud
.. section: Library

Forbid expansion of shared anonymous :mod:`memory maps <mmap>` on Linux,
which caused a bus error.

..

.. date: 2025-08-27-17-05-36
.. gh-issue: 138010
.. nonce: ZZJmPL
.. section: Library

Fix an issue where defining a class with an :func:`@warnings.deprecated
<warnings.deprecated>`-decorated base class may not invoke the correct
:meth:`~object.__init_subclass__` method in cases involving multiple
inheritance. Patch by Brian Schubert.

..

.. date: 2025-08-26-08-17-56
.. gh-issue: 138151
.. nonce: I6CdAk
.. section: Library

In :mod:`annotationlib`, improve evaluation of forward references to
nonlocal variables that are not yet defined when the annotations are
initially evaluated.

..

.. date: 2025-08-16-16-04-15
.. gh-issue: 137317
.. nonce: Dl13B5
.. section: Library

:func:`inspect.signature` now correctly handles classes that use a
descriptor on a wrapped :meth:`!__init__` or :meth:`!__new__` method.
Contributed by Yongyu Yan.

..

.. date: 2025-08-16-09-02-11
.. gh-issue: 137754
.. nonce: mCev1Y
.. section: Library

Fix import of the :mod:`zoneinfo` module if the C implementation of the
:mod:`datetime` module is not available.

..

.. date: 2025-08-07-17-18-57
.. gh-issue: 137490
.. nonce: s89ieZ
.. section: Library

Handle :data:`~errno.ECANCELED` in the same way as :data:`~errno.EINTR` in
:func:`signal.sigwaitinfo` on NetBSD.

..

.. date: 2025-08-06-23-16-42
.. gh-issue: 137477
.. nonce: bk6BDV
.. section: Library

Fix :func:`!inspect.getblock`, :func:`inspect.getsourcelines` and
:func:`inspect.getsource` for generator expressions.

..

.. date: 2025-08-03-13-16-39
.. gh-issue: 137044
.. nonce: 0hPVL_
.. section: Library

Return large limit values as positive integers instead of negative integers
in :func:`resource.getrlimit`. Accept large values and reject negative
values (except :data:`~resource.RLIM_INFINITY`) for limits in
:func:`resource.setrlimit`.

..

.. date: 2025-08-01-23-52-49
.. gh-issue: 75989
.. nonce: 5aYXNJ
.. section: Library

:func:`tarfile.TarFile.extractall` and :func:`tarfile.TarFile.extract` now
overwrite symlinks when extracting hardlinks. (Contributed by Alexander
Enrique Urieles Nieto in :gh:`75989`.)

..

.. date: 2025-08-01-23-11-25
.. gh-issue: 137017
.. nonce: 0yGcNc
.. section: Library

Fix :obj:`threading.Thread.is_alive` to remain ``True`` until the underlying
OS thread is fully cleaned up. This avoids false negatives in edge cases
involving thread monitoring or premature :obj:`threading.Thread.is_alive`
calls.

..

.. date: 2025-08-01-15-07-59
.. gh-issue: 137273
.. nonce: 4V8Xmv
.. section: Library

Fix debug assertion failure in :func:`locale.setlocale` on Windows.

..

.. date: 2025-07-30-17-42-36
.. gh-issue: 137239
.. nonce: qSpj32
.. section: Library

:mod:`heapq`: Update :data:`!heapq.__all__` with ``*_max`` functions.

..

.. date: 2025-07-28-23-11-29
.. gh-issue: 81325
.. nonce: jMJFBe
.. section: Library

:class:`tarfile.TarFile` now accepts a :term:`path-like <path-like object>`
when working on a tar archive. (Contributed by Alexander Enrique Urieles
Nieto in :gh:`81325`.)

..

.. date: 2025-07-28-20-48-32
.. gh-issue: 137185
.. nonce: fgI7-B
.. section: Library

Fix a potential async-signal-safety issue in :mod:`faulthandler` when
printing C stack traces.

..

.. date: 2025-07-21-15-40-00
.. gh-issue: 136914
.. nonce: -GNG-d
.. section: Library

Fix retrieval of :attr:`doctest.DocTest.lineno` for objects decorated with
:func:`functools.cache` or :class:`functools.cached_property`.

..

.. date: 2025-07-21-11-56-47
.. gh-issue: 136912
.. nonce: zWosAL
.. section: Library

:func:`hmac.digest` now properly handles large keys and messages by falling
back to the pure Python implementation when necessary. Patch by Bénédikt
Tran.

..

.. date: 2025-07-21-01-16-32
.. gh-issue: 83424
.. nonce: Y3tEV4
.. section: Library

Allows creating a :class:`ctypes.CDLL` without name when passing a handle as
an argument.

..

.. date: 2025-07-17-16-12-23
.. gh-issue: 136234
.. nonce: VmTxtj
.. section: Library

Fix :meth:`asyncio.WriteTransport.writelines` to be robust to connection
failure, by using the same behavior as
:meth:`~asyncio.WriteTransport.write`.

..

.. date: 2025-07-10-21-02-43
.. gh-issue: 136507
.. nonce: pnEuGS
.. section: Library

Fix mimetypes CLI to handle multiple file parameters.

..

.. date: 2025-07-01-04-57-57
.. gh-issue: 136057
.. nonce: 4-t596
.. section: Library

Fixed the bug in :mod:`pdb` and :mod:`bdb` where ``next`` and ``step`` can't
go over the line if a loop exists in the line.

..

.. date: 2025-06-16-15-00-13
.. gh-issue: 135386
.. nonce: lNrxLc
.. section: Library

Fix opening a :mod:`dbm.sqlite3` database for reading from read-only file or
directory.

..

.. date: 2025-06-16-12-37-02
.. gh-issue: 135444
.. nonce: An2eeA
.. section: Library

Fix :meth:`asyncio.DatagramTransport.sendto` to account for datagram header
size when data cannot be sent.

..

.. date: 2025-06-10-21-00-48
.. gh-issue: 126631
.. nonce: eITVJd
.. section: Library

Fix :mod:`multiprocessing` ``forkserver`` bug which prevented ``__main__``
from being preloaded.

..

.. date: 2025-06-10-18-02-29
.. gh-issue: 135307
.. nonce: fXGrcK
.. section: Library

:mod:`email`: Fix exception in ``set_content()`` when encoding text and
max_line_length is set to ``0`` or ``None`` (unlimited).

..

.. date: 2025-05-30-18-37-44
.. gh-issue: 134453
.. nonce: kxkA-o
.. section: Library

Fixed :func:`subprocess.Popen.communicate` ``input=`` handling of
:class:`memoryview` instances that were non-byte shaped on POSIX platforms.
Those are now properly cast to a byte shaped view instead of truncating the
input.  Windows platforms did not have this bug.

..

.. date: 2025-05-26-10-52-27
.. gh-issue: 134698
.. nonce: aJ1mZ1
.. section: Library

Fix a crash when calling methods of :class:`ssl.SSLContext` or
:class:`ssl.SSLSocket` across multiple threads.

..

.. date: 2025-05-10-17-42-03
.. gh-issue: 125996
.. nonce: vaQp0-
.. section: Library

Fix thread safety of :class:`collections.OrderedDict`. Patch by Kumar
Aditya.

..

.. date: 2025-05-10-15-10-54
.. gh-issue: 133789
.. nonce: I-ZlUX
.. section: Library

Fix unpickling of :mod:`pathlib` objects that were pickled in Python 3.13.

..

.. date: 2025-04-21-01-05-14
.. gh-issue: 127081
.. nonce: Egrpq7
.. section: Library

Fix libc thread safety issues with :mod:`dbm` by performing stateful
operations in critical sections.

..

.. date: 2025-04-16-21-02-57
.. gh-issue: 132551
.. nonce: Psa7pL
.. section: Library

Make :class:`io.BytesIO` safe in :term:`free-threaded <free threading>`
build.

..

.. date: 2025-03-27-08-13-32
.. gh-issue: 131788
.. nonce: 0RWiFc
.. section: Library

Make ``ResourceTracker.send`` from :mod:`multiprocessing` re-entrant safe

..

.. date: 2024-05-13-09-50-31
.. gh-issue: 118981
.. nonce: zgOQPv
.. section: Library

Fix potential hang in ``multiprocessing.popen_spawn_posix`` that can happen
when the child proc dies early by closing the child fds right away.

..

.. date: 2023-03-21-10-59-40
.. gh-issue: 102431
.. nonce: eUDnf4
.. section: Library

Clarify constraints for "logical" arguments in methods of
:class:`decimal.Context`.

..

.. date: 2023-02-13-20-34-52
.. gh-issue: 78319
.. nonce: V1zzed
.. section: Library

UTF8 support for the IMAP APPEND command has been made RFC compliant.

..

.. bpo: 38735
.. date: 2022-01-07-16-56-57
.. nonce: NFfJX6
.. section: Library

Fix failure when importing a module from the root directory on unix-like
platforms with sys.pycache_prefix set.

..

.. bpo: 41839
.. date: 2020-09-23-11-54-17
.. nonce: kU5Ywl
.. section: Library

Allow negative priority values from :func:`os.sched_get_priority_min` and
:func:`os.sched_get_priority_max` functions.

..

.. date: 2025-10-09-12-53-47
.. gh-issue: 96491
.. nonce: 4YKxvy
.. section: IDLE

Deduplicate version number in IDLE shell title bar after saving to a file.

..

.. date: 2025-10-08-08-35-50
.. gh-issue: 139742
.. nonce: B3fZLg
.. section: IDLE

Colorize t-string prefixes for template strings in IDLE, as done for
f-string prefixes.

..

.. date: 2025-11-26-23-30-09
.. gh-issue: 141994
.. nonce: arBEG6
.. section: Documentation

:mod:`xml.sax.handler`: Make Documentation of
:data:`xml.sax.handler.feature_external_ges` warn of opening up to `external
entity attacks <https://en.wikipedia.org/wiki/XML_external_entity_attack>`_.
Patch by Sebastian Pipping.

..

.. date: 2025-10-27-23-06-01
.. gh-issue: 140578
.. nonce: FMBdEn
.. section: Documentation

Remove outdated sencence in the documentation for :mod:`multiprocessing`,
that implied that :class:`concurrent.futures.ThreadPoolExecutor` did not
exist.

..

.. date: 2025-12-01-20-41-26
.. gh-issue: 142048
.. nonce: c2YosX
.. section: Core and Builtins

Fix quadratically increasing garbage collection delays in free-threaded
build.

..

.. date: 2025-11-25-13-13-34
.. gh-issue: 116738
.. nonce: MnZRdV
.. section: Library

Fix thread safety issue with :mod:`re` scanner objects in free-threaded
builds.

..

.. date: 2025-11-24-21-09-30
.. gh-issue: 141930
.. nonce: hIIzSd
.. section: Core and Builtins

When importing a module, use Python's regular file object to ensure that
writes to ``.pyc`` files are complete or an appropriate error is raised.

..

.. date: 2025-11-22-10-43-26
.. gh-issue: 120158
.. nonce: 41_rXd
.. section: Core and Builtins

Fix inconsistent state when enabling or disabling monitoring events too many
times.

..

.. date: 2025-11-17-14-40-45
.. gh-issue: 139653
.. nonce: LzOy1M
.. section: Core and Builtins

Only raise a ``RecursionError`` or trigger a fatal error if the stack
pointer is both below the limit pointer *and* above the stack base. If
outside of these bounds assume that it is OK. This prevents false positives
when user-space threads swap stacks.

..

.. date: 2025-11-15-23-58-23
.. gh-issue: 139103
.. nonce: 9cVYJ0
.. section: Core and Builtins

Improve multithreaded scaling of dataclasses on the free-threaded build.

..

.. date: 2025-11-15-01-21-00
.. gh-issue: 141579
.. nonce: aB7cD9
.. section: Core and Builtins

Fix :func:`sys.activate_stack_trampoline` to properly support the
``perf_jit`` backend. Patch by Pablo Galindo.

..

.. date: 2025-11-14-16-25-15
.. gh-issue: 114203
.. nonce: n3tlQO
.. section: Core and Builtins

Skip locking if object is already locked by two-mutex critical section.

..

.. date: 2025-11-14-00-19-45
.. gh-issue: 141528
.. nonce: VWdax1
.. section: Core and Builtins

Suggest using :meth:`concurrent.interpreters.Interpreter.close` instead of
the private ``_interpreters.destroy`` function when warning about remaining
subinterpreters. Patch by Sergey Miryanov.

..

.. date: 2025-11-10-23-07-06
.. gh-issue: 141312
.. nonce: H-58GB
.. section: Core and Builtins

Fix the assertion failure in the ``__setstate__`` method of the range
iterator when a non-integer argument is passed. Patch by Sergey Miryanov.

..

.. date: 2025-11-10-00-14-20
.. gh-issue: 116738
.. nonce: IxliC_
.. section: Library

Make csv module thread-safe on the :term:`free threaded <free threading>`
build.

..

.. date: 2025-11-03-17-21-38
.. gh-issue: 140939
.. nonce: FVboAw
.. section: Core and Builtins

Fix memory leak when :class:`bytearray` or :class:`bytes` is formated with
the ``%*b`` format with a large width that results in a :exc:`MemoryError`.

..

.. date: 2025-11-02-15-28-33
.. gh-issue: 140260
.. nonce: JNzlGz
.. section: Library

Fix :mod:`struct` data race in endian table initialization with
subinterpreters. Patch by Shamil Abdulaev.

..

.. date: 2025-11-02-12-47-38
.. gh-issue: 140530
.. nonce: S934bp
.. section: Core and Builtins

Fix a reference leak when ``raise exc from cause`` fails. Patch by Bénédikt
Tran.

..

.. date: 2025-10-29-20-59-10
.. gh-issue: 140373
.. nonce: -uoaPP
.. section: Core and Builtins

Correctly emit ``PY_UNWIND`` event when generator object is closed. Patch by
Mikhail Efimov.

..

.. date: 2025-10-25-17-36-46
.. gh-issue: 140576
.. nonce: kj0SCY
.. section: Core and Builtins

Fixed crash in :func:`tokenize.generate_tokens` in case of specific
incorrect input. Patch by Mikhail Efimov.

..

.. date: 2025-10-24-20-42-33
.. gh-issue: 140551
.. nonce: -9swrl
.. section: Core and Builtins

Fixed crash in :class:`dict` if :meth:`dict.clear` is called at the lookup
stage. Patch by Mikhail Efimov and Inada Naoki.

..

.. date: 2025-10-24-20-16-42
.. gh-issue: 140517
.. nonce: cqun-K
.. section: Core and Builtins

Fixed a reference leak when iterating over the result of :func:`map` with
``strict=True`` when the input iterables have different lengths. Patch by
Mikhail Efimov.

..

.. date: 2025-10-23-16-05-50
.. gh-issue: 140471
.. nonce: Ax_aXn
.. section: Core and Builtins

Fix potential buffer overflow in :class:`ast.AST` node initialization when
encountering malformed :attr:`~ast.AST._fields` containing non-:class:`str`.

..

.. date: 2025-10-22-17-22-22
.. gh-issue: 140431
.. nonce: m8D_A-
.. section: Core and Builtins

Fix a crash in Python's :term:`garbage collector <garbage collection>` due
to partially initialized :term:`coroutine` objects when coroutine origin
tracking depth is enabled (:func:`sys.set_coroutine_origin_tracking_depth`).

..

.. date: 2025-10-21-09-20-03
.. gh-issue: 140398
.. nonce: SoABwJ
.. section: Library

Fix memory leaks in :mod:`readline` functions
:func:`~readline.read_init_file`, :func:`~readline.read_history_file`,
:func:`~readline.write_history_file`, and
:func:`~readline.append_history_file` when :c:func:`PySys_Audit` fails.

..

.. date: 2025-10-21-06-51-50
.. gh-issue: 140406
.. nonce: 0gJs8M
.. section: Core and Builtins

Fix memory leak when an object's :meth:`~object.__hash__` method returns an
object that isn't an :class:`int`.

..

.. date: 2025-10-20-11-24-36
.. gh-issue: 140358
.. nonce: UQuKdV
.. section: Core and Builtins

Restore elapsed time and unreachable object count in GC debug output. These
were inadvertently removed during a refactor of ``gc.c``. The debug log now
again reports elapsed collection time and the number of unreachable objects.
Contributed by Pål Grønås Drange.

..

.. date: 2025-10-18-21-29-45
.. gh-issue: 140306
.. nonce: xS5CcS
.. section: Core and Builtins

Fix memory leaks in cross-interpreter channel operations and shared
namespace handling.

..

.. date: 2025-10-18-18-08-36
.. gh-issue: 140301
.. nonce: m-2HxC
.. section: Core and Builtins

Fix memory leak of ``PyConfig`` in subinterpreters.

..

.. date: 2025-10-17-20-23-19
.. gh-issue: 140257
.. nonce: 8Txmem
.. section: Core and Builtins

Fix data race between interpreter_clear() and take_gil() on eval_breaker
during finalization with daemon threads.

..

.. date: 2025-10-17-18-03-12
.. gh-issue: 139951
.. nonce: IdwM2O
.. section: Core and Builtins

Fixes a regression in GC performance for a growing heap composed mostly of
small tuples.

*  Counts number of actually tracked objects, instead of trackable objects.
   This ensures that untracking tuples has the desired effect of reducing GC overhead.
*  Does not track most untrackable tuples during creation.
   This prevents large numbers of small tuples causing excessive GCs.

..

.. date: 2025-10-16-21-47-00
.. gh-issue: 140104
.. nonce: A8SQIm
.. section: Core and Builtins

Fix a bug with exception handling in the JIT. Patch by Ken Jin. Bug reported
by Daniel Diniz.

..

.. date: 2025-10-15-00-21-40
.. gh-issue: 140061
.. nonce: J0XeDV
.. section: Core and Builtins

Fixing the checking of whether an object is uniquely referenced to ensure
free-threaded compatibility. Patch by Sergey Miryanov.

..

.. date: 2025-10-14-17-07-37
.. gh-issue: 140067
.. nonce: ID2gOm
.. section: Core and Builtins

Fix memory leak in sub-interpreter creation.

..

.. date: 2025-10-13-17-56-23
.. gh-issue: 140000
.. nonce: tLhn3e
.. section: Core and Builtins

Fix potential memory leak when a reference cycle exists between an instance
of :class:`typing.TypeAliasType`, :class:`typing.TypeVar`,
:class:`typing.ParamSpec`, or :class:`typing.TypeVarTuple` and its
``__name__`` attribute. Patch by Mikhail Efimov.

..

.. date: 2025-10-13-13-54-19
.. gh-issue: 139914
.. nonce: M-y_3E
.. section: Core and Builtins

Restore support for HP PA-RISC, which has an upwards-growing stack.

..

.. date: 2025-10-12-11-00-06
.. gh-issue: 139988
.. nonce: 4wi51t
.. section: Core and Builtins

Fix a memory leak when failing to create a :class:`~typing.Union` type.
Patch by Bénédikt Tran.

..

.. date: 2025-10-08-13-52-00
.. gh-issue: 139748
.. nonce: jq0yFJ
.. section: Core and Builtins

Fix reference leaks in error branches of functions accepting path strings or
bytes such as :func:`compile` and :func:`os.system`. Patch by Bénédikt Tran.

..

.. date: 2025-10-06-13-15-26
.. gh-issue: 139516
.. nonce: d9Pkur
.. section: Core and Builtins

Fix lambda colon erroneously start format spec in f-string in tokenizer.

..

.. date: 2025-10-06-10-03-37
.. gh-issue: 139640
.. nonce: gY5oTb2
.. section: Core and Builtins

:func:`ast.parse` no longer emits syntax warnings for
``return``/``break``/``continue`` in ``finally`` (see :pep:`765`) -- they
are only emitted during compilation.

..

.. date: 2025-10-06-10-03-37
.. gh-issue: 139640
.. nonce: gY5oTb
.. section: Core and Builtins

Fix swallowing some syntax warnings in different modules if they
accidentally have the same message and are emitted from the same line. Fix
duplicated warnings in the ``finally`` block.

..

.. date: 2025-10-01-18-21-19
.. gh-issue: 63161
.. nonce: ef1S6N
.. section: Core and Builtins

Support non-UTF-8 shebang and comments in Python source files if non-UTF-8
encoding is specified. Detect decoding error in comments for default (UTF-8)
encoding. Show the line and position of decoding error for default encoding
in a traceback. Show the line containing the coding cookie when it conflicts
with the BOM in a traceback.

..

.. date: 2025-09-21-14-33-17
.. gh-issue: 116738
.. nonce: vNaI4h
.. section: Library

Make :mod:`mmap` thread-safe on the :term:`free threaded <free threading>`
build.

..

.. date: 2025-09-17-17-17-21
.. gh-issue: 138558
.. nonce: 0VbzCH
.. section: Core and Builtins

Fix handling of unusual t-string annotations in annotationlib. Patch by Dave
Peck.

..

.. date: 2025-09-15-14-04-56
.. gh-issue: 134466
.. nonce: yR4fYW
.. section: Core and Builtins

Don't run PyREPL in a degraded environment where setting termios attributes
is not allowed.

..

.. date: 2025-09-15-13-06-11
.. gh-issue: 138944
.. nonce: PeCgLb
.. section: Core and Builtins

Fix :exc:`SyntaxError` message when invalid syntax appears on the same line
as a valid ``import ... as ...`` or ``from ... import ... as ...``
statement. Patch by Brian Schubert.

..

.. date: 2025-09-06-13-53-33
.. gh-issue: 105487
.. nonce: a43YaY
.. section: Core and Builtins

Remove non-existent :meth:`~object.__copy__`, :meth:`~object.__deepcopy__`,
and :attr:`~type.__bases__` from the :meth:`~object.__dir__` entries of
:class:`types.GenericAlias`.

..

.. date: 2025-08-30-17-15-05
.. gh-issue: 69605
.. nonce: KjBk99
.. section: Core and Builtins

Fix some standard library submodules missing from the :term:`REPL`
auto-completion of imports.

..

.. date: 2025-08-28-09-29-46
.. gh-issue: 116738
.. nonce: yLZJpV
.. section: Library

Make :mod:`cProfile` thread-safe on the :term:`free threaded <free
threading>` build.

..

.. date: 2025-08-21-06-31-42
.. gh-issue: 138004
.. nonce: FH2Hre
.. section: Library

On Solaris/Illumos platforms, thread names are now encoded as ASCII to avoid
errors on systems (e.g. OpenIndiana) that don't support non-ASCII names.

..

.. date: 2025-08-13-13-39-02
.. gh-issue: 137433
.. nonce: g6Atfz
.. section: Core and Builtins

Fix a potential deadlock in the :term:`free threading` build when daemon
threads enable or disable profiling or tracing while the main thread is
shutting down the interpreter.

..

.. date: 2025-08-07-09-52-19
.. gh-issue: 137400
.. nonce: AK1dy-
.. section: Core and Builtins

Fix a crash in the :term:`free threading` build when disabling profiling or
tracing across all threads with :c:func:`PyEval_SetProfileAllThreads` or
:c:func:`PyEval_SetTraceAllThreads` or their Python equivalents
:func:`threading.settrace_all_threads` and
:func:`threading.setprofile_all_threads`.

..

.. date: 2025-08-05-17-22-24
.. gh-issue: 58124
.. nonce: q1__53
.. section: Core and Builtins

Fix name of the Python encoding in Unicode errors of the code page codec:
use "cp65000" and "cp65001" instead of "CP_UTF7" and "CP_UTF8" which are not
valid Python code names. Patch by Victor Stinner.

..

.. date: 2025-07-09-21-27-14
.. gh-issue: 132657
.. nonce: kSA8R3
.. section: Core and Builtins

Improve performance of :class:`frozenset` by removing locks in the
free-threading build.

..

.. date: 2025-05-11-09-40-19
.. gh-issue: 133400
.. nonce: zkWla8
.. section: Core and Builtins

Fixed Ctrl+D (^D) behavior in _pyrepl module to match old pre-3.13 REPL
behavior.

..

.. date: 2025-01-08-12-52-47
.. gh-issue: 128640
.. nonce: 9nbh9z
.. section: Core and Builtins

Fix a crash when using threads inside of a subinterpreter.

..

.. date: 2025-11-21-10-34-00
.. gh-issue: 137422
.. nonce: tzZKLi
.. section: C API

Fix :term:`free threading` race condition in
:c:func:`PyImport_AddModuleRef`. It was previously possible for two calls to
the function return two different objects, only one of which was stored in
:data:`sys.modules`.

..

.. date: 2025-11-18-04-16-09
.. gh-issue: 140042
.. nonce: S1C7id
.. section: C API

Removed the sqlite3_shutdown call that could cause closing connections for
sqlite when used with multiple sub interpreters.

..

.. date: 2025-11-06-06-28-14
.. gh-issue: 141042
.. nonce: brOioJ
.. section: C API

Make qNaN in :c:func:`PyFloat_Pack2` and :c:func:`PyFloat_Pack4`, if while
conversion to a narrower precision floating-point format --- the remaining
after truncation payload will be zero.  Patch by Sergey B Kirpichev.

..

.. date: 2025-10-26-16-45-06
.. gh-issue: 140487
.. nonce: fGOqss
.. section: C API

Fix :c:macro:`Py_RETURN_NOTIMPLEMENTED` in limited C API 3.11 and older:
don't treat ``Py_NotImplemented`` as immortal. Patch by Victor Stinner.

..

.. date: 2025-10-15-15-59-59
.. gh-issue: 140153
.. nonce: BO7sH4
.. section: C API

Fix :c:func:`Py_REFCNT` definition on limited C API 3.11-3.13. Patch by
Victor Stinner.

..

.. date: 2025-10-06-22-17-47
.. gh-issue: 139653
.. nonce: 6-1MOd
.. section: C API

Add :c:func:`PyUnstable_ThreadState_SetStackProtection` and
:c:func:`PyUnstable_ThreadState_ResetStackProtection` functions to set the
stack protection base address and stack protection size of a Python thread
state. Patch by Victor Stinner.

..

.. date: 2025-11-28-19-49-01
.. gh-issue: 141808
.. nonce: cV5K12
.. section: Build

Do not generate the jit stencils twice in case of PGO builds on Windows.

..

.. date: 2025-11-20-17-01-05
.. gh-issue: 141784
.. nonce: LkYI2n
.. section: Build

Fix ``_remote_debugging_module.c`` compilation on 32-bit Linux. Include
Python.h before system headers to make sure that
``_remote_debugging_module.c`` uses the same types (ABI) than Python. Patch
by Victor Stinner.

..

.. date: 2025-10-29-12-30-38
.. gh-issue: 140768
.. nonce: ITYrzw
.. section: Build

Warn when the WASI SDK version doesn't match what's supported.

..

.. date: 2025-10-25-08-07-06
.. gh-issue: 140513
.. nonce: 6OhLTs
.. section: Build

Generate a clear compilation error when ``_Py_TAIL_CALL_INTERP`` is enabled
but either ``preserve_none`` or ``musttail`` is not supported.

..

.. date: 2025-10-16-11-30-53
.. gh-issue: 140189
.. nonce: YCrUyt
.. section: Build

iOS builds were added to CI.

..

.. date: 2025-09-24-13-59-26
.. gh-issue: 138489
.. nonce: 1AcuZM
.. section: Build

When cross-compiling for WASI by ``build_wasm`` or ``build_emscripten``, the
``build-details.json`` step is now included in the build process, just like
with native builds.

This fixes the ``libinstall`` task which requires the ``build-details.json``
file during the process.

..

.. date: 2025-08-10-22-28-06
.. gh-issue: 137618
.. nonce: FdNvIE
.. section: Build

``PYTHON_FOR_REGEN`` now requires Python 3.10 to Python 3.15. Patch by Adam
Turner.

..

.. date: 2025-01-03-13-02-06
.. gh-issue: 123681
.. nonce: gQ67nK
.. section: Build

Check the ``strftime()`` behavior at runtime instead of at the compile time
to support cross-compiling. Remove the internal macro
``_Py_NORMALIZE_CENTURY``.