.. date: 2025-04-25-13-34-27
.. gh-issue: 132930
.. nonce: 6MJumW
.. release date: 2025-05-06
.. section: Windows

Marks the installer for Windows as deprecated and updates documentation to
cover the new Python install manager.

..

.. date: 2025-03-27-16-22-58
.. gh-issue: 127405
.. nonce: aASs2Z
.. section: Windows

Add ``ABIFLAGS`` to :func:`sysconfig.get_config_vars` on Windows. Patch by
Xuehai Pan.

..

.. date: 2025-03-10-08-19-22
.. gh-issue: 130453
.. nonce: 9B0x8k
.. section: Tools/Demos

Allow passing multiple keyword arguments with the same function name in
:program:`pygettext`.

..

.. date: 2025-02-16-19-00-00
.. gh-issue: 130195
.. nonce: 19274
.. section: Tools/Demos

Add warning messages when :program:`pygettext` unimplemented
``-a/--extract-all`` option is called.

..

.. date: 2025-04-29-14-56-37
.. gh-issue: 133131
.. nonce: 1pchjl
.. section: Tests

The iOS testbed will now select the most recently released "SE-class" device
for testing if a device isn't explicitly specified.

..

.. date: 2025-04-23-12-40-27
.. gh-issue: 91048
.. nonce: WJQCdV
.. section: Tests

Add ability to externally inspect all pending asyncio tasks, even if no task
is currently entered on the event loop.

..

.. date: 2025-04-23-02-23-37
.. gh-issue: 109981
.. nonce: IX3k8p
.. section: Tests

The test helper that counts the list of open file descriptors now uses the
optimised ``/dev/fd`` approach on all Apple platforms, not just macOS. This
avoids crashes caused by guarded file descriptors.

..

.. date: 2025-04-18-14-00-38
.. gh-issue: 132678
.. nonce: j_ZKf2
.. section: Tests

Add ``--prioritize`` to ``-m test``. This option allows the user to specify
which selected tests should execute first, even if the order is otherwise
randomized. This is particularly useful for tests that run the longest.

..

.. date: 2025-03-17-19-47-27
.. gh-issue: 131290
.. nonce: NyCIXR
.. section: Tests

Tests in :file:`Lib/test` can now be correctly executed as standalone
scripts.

..

.. date: 2024-02-18-02-53-25
.. gh-issue: 115322
.. nonce: Um2Sjx
.. section: Security

The underlying extension modules behind :mod:`readline`:, :mod:`subprocess`,
and :mod:`ctypes` now raise audit events on previously uncovered code paths
that could lead to file system access related to C function calling and
external binary execution.  The ``ctypes.call_function`` audit hook has also
been fixed to use an unsigned value for its ``function pointer``.

..

.. date: 2025-05-06-00-10-10
.. gh-issue: 133490
.. nonce: Ubrppz
.. section: Library

Add color support to PDB in remote mode.

..

.. date: 2025-05-04-16-37-28
.. gh-issue: 132493
.. nonce: 5yjZ75
.. section: Library

Avoid eagerly evaluating annotations in functions decorated with
:func:`reprlib.recursive_repr`.

..

.. date: 2025-05-04-16-00-01
.. gh-issue: 130645
.. nonce: yNwKue
.. section: Library

Add color to stdlib argparse CLIs. Patch by Hugo van Kemenade.

..

.. date: 2025-05-04-15-39-25
.. gh-issue: 119180
.. nonce: avZ3Hm
.. section: Library

Make :func:`annotationlib.get_annotations` succeed with the ``FORWARDREF``
format if evaluating the annotations throws an exception other than
:exc:`NameError` or :exc:`AttributeError`.

..

.. date: 2025-05-04-13-46-20
.. gh-issue: 133351
.. nonce: YsZls1
.. section: Library

Fix remote PDB to correctly request tab completions for Python expressions
from the server when completing a continuation line of a multi-line Python
block.

..

.. date: 2025-05-04-13-40-05
.. gh-issue: 133367
.. nonce: E5nl2u
.. section: Library

Add the ``--feature-version``, ``--optimize``, and ``--show-empty`` options
to the :mod:`ast` command-line interface. Patch by Semyon Moroz.

..

.. date: 2025-05-03-21-55-33
.. gh-issue: 133363
.. nonce: PTLnRP
.. section: Library

The :class:`cmd.Cmd` class has been fixed to reliably call the
``completedefault`` method whenever the ``do_shell`` method is not defined
and tab completion is requested for a line beginning with ``!``.

..

.. date: 2025-05-03-18-48-54
.. gh-issue: 113081
.. nonce: JsLJ1X
.. section: Library

Highlight syntax on source code in :mod:`pdb`.

..

.. date: 2025-05-03-16-04-04
.. gh-issue: 133349
.. nonce: kAhJDY
.. section: Library

Introduced auto-indent in :mod:`pdb` multi-line input.

..

.. date: 2025-05-03-13-19-22
.. gh-issue: 133306
.. nonce: ustKV3
.. section: Library

Use ``\z`` instead of ``\Z`` in :func:`fnmatch.translate` and
:func:`glob.translate`.

..

.. date: 2025-05-02-21-35-03
.. gh-issue: 133306
.. nonce: -vBye5
.. section: Library

Support ``\z`` as a synonym for ``\Z`` in :mod:`regular expressions <re>`.

..

.. date: 2025-05-02-17-23-41
.. gh-issue: 133300
.. nonce: oAh1P2
.. section: Library

Make :class:`argparse.ArgumentParser`'s ``suggest_on_error`` a keyword-only
parameter. Patch by Hugo van Kemenade.

..

.. date: 2025-05-02-13-16-44
.. gh-issue: 133290
.. nonce: R5WrLM
.. section: Library

Fix attribute caching issue when setting :attr:`ctypes._Pointer._type_` in
the undocumented and deprecated :func:`!ctypes.SetPointerType` function and
the undocumented :meth:`!set_type` method.

..

.. date: 2025-05-01-18-32-44
.. gh-issue: 133223
.. nonce: KE_T5f
.. section: Library

When PDB is attached to a remote process, do a better job of intercepting
Ctrl+C and forwarding it to the remote process.

..

.. date: 2025-04-29-23-20-52
.. gh-issue: 133153
.. nonce: M-w9yC
.. section: Library

Do not complete :mod:`pdb` commands in ``interact`` mode of :mod:`pdb`.

..

.. date: 2025-04-29-13-40-05
.. gh-issue: 133139
.. nonce: 9yCcC2
.. section: Library

Add the :func:`curses.assume_default_colors` function, a refinement of the
:func:`curses.use_default_colors` function which allows to change the color
pair ``0``.

..

.. date: 2025-04-29-02-23-04
.. gh-issue: 133089
.. nonce: 8Jy1ZS
.. section: Library

Use original timeout value for :exc:`subprocess.TimeoutExpired` when the
func :meth:`subprocess.run` is called with a timeout instead of sometimes a
confusing partial remaining time out value used internally on the final
``wait()``.

..

.. date: 2025-04-27-15-21-05
.. gh-issue: 133036
.. nonce: HCNYA7
.. section: Library

:func:`codecs.open` is now deprecated. Use :func:`open` instead. Contributed
by Inada Naoki.

..

.. date: 2025-04-26-17-41-20
.. gh-issue: 132987
.. nonce: xxBCqg
.. section: Library

Many builtin and extension functions which accept an unsigned integer
argument, now use :meth:`~object.__index__` if available.

..

.. date: 2025-04-26-15-43-23
.. gh-issue: 124703
.. nonce: jc5auS
.. section: Library

Set return code to ``1`` when aborting process from :mod:`pdb`.

..

.. date: 2025-04-26-14-44-21
.. gh-issue: 133005
.. nonce: y4SRfk
.. section: Library

Support passing ``preset`` option to :func:`tarfile.open` when using
``'w|xz'`` mode.

..

.. date: 2025-04-26-12-25-42
.. gh-issue: 115032
.. nonce: jnM2Co
.. section: Library

Support for custom logging handlers with the *strm* argument is deprecated
and scheduled for removal in Python 3.16. Define handlers with the *stream*
argument instead. Patch by Mariusz Felisiak.

..

.. date: 2025-04-26-10-57-15
.. gh-issue: 132991
.. nonce: ekkqdt
.. section: Library

Add :data:`!socket.IP_FREEBIND` constant on Linux 2.4 and later.

..

.. date: 2025-04-26-10-54-38
.. gh-issue: 132995
.. nonce: JuDF9p
.. section: Library

Bump the version of pip bundled in ensurepip to version 25.1.1

..

.. date: 2025-04-25-21-41-45
.. gh-issue: 132933
.. nonce: yO3ySJ
.. section: Library

The zipapp module now applies the filter when creating the list of files to
add, rather than waiting until the file is being added to the archive.

..

.. date: 2025-04-25-16-20-49
.. gh-issue: 121249
.. nonce: uue2nK
.. section: Library

Always support the :c:expr:`float complex` and :c:expr:`double complex` C
types in the :mod:`struct` module.  Patch by Sergey B Kirpichev.

..

.. date: 2025-04-25-12-55-06
.. gh-issue: 132915
.. nonce: XuKCXn
.. section: Library

:func:`fcntl.fcntl` and :func:`fcntl.ioctl` can now detect a buffer overflow
and raise :exc:`SystemError`. The stack and memory can be corrupted in such
case, so treat this error as fatal.

..

.. date: 2025-04-25-10-51-00
.. gh-issue: 132017
.. nonce: SIGCONT1
.. section: Library

Fix error when ``pyrepl`` is suspended, then resumed and terminated.

..

.. date: 2025-04-24-21-22-46
.. gh-issue: 132893
.. nonce: KFuxZ2
.. section: Library

Improved :meth:`statistics.NormalDist.cdf` accuracy for inputs smaller than
the mean.

..

.. date: 2025-04-24-18-07-49
.. gh-issue: 130328
.. nonce: z7CN8z
.. section: Library

Speedup pasting in ``PyREPL`` on Windows. Fix by Chris Eibl.

..

.. date: 2025-04-24-09-10-04
.. gh-issue: 132882
.. nonce: 6zoyp5
.. section: Library

Fix copying of :class:`typing.Union` objects containing objects that do not
support the ``|`` operator.

..

.. date: 2025-04-24-01-03-40
.. gh-issue: 93696
.. nonce: kM-MBp
.. section: Library

Fixed the breakpoint display error for frozen modules in :mod:`pdb`.

..

.. date: 2025-04-23-18-35-09
.. gh-issue: 129965
.. nonce: nj7Fx2
.. section: Library

Add MIME types for ``.7z``, ``.apk``, ``.deb``, ``.glb``, ``.gltf``,
``.gz``, ``.m4v``, ``.php``, ``.rar``, ``.rpm``, ``.stl`` and ``.wmv``.
Patch by Hugo van Kemenade.

..

.. date: 2025-04-23-14-50-45
.. gh-issue: 132742
.. nonce: PB6B7F
.. section: Library

:func:`fcntl.fcntl` now supports arbitrary :term:`bytes-like objects
<bytes-like object>`, not only :class:`bytes`. :func:`fcntl.ioctl` now
automatically retries system calls failing with EINTR and releases the GIL
during a system call even for large bytes-like object.

..

.. date: 2025-04-22-19-45-46
.. gh-issue: 132451
.. nonce: eIzMvE
.. section: Library

The CLI for the PDB debugger now accepts a ``-p PID`` argument to allow
attaching to a running process. The process must be running the same version
of Python as the one running PDB.

..

.. date: 2025-04-22-16-35-37
.. gh-issue: 125618
.. nonce: PEocn3
.. section: Library

Add a *format* parameter to :meth:`annotationlib.ForwardRef.evaluate`.
Evaluating annotations in the ``FORWARDREF`` format now succeeds in more
cases that would previously have raised an exception.

..

.. date: 2025-04-22-13-42-12
.. gh-issue: 132805
.. nonce: r-dhmJ
.. section: Library

Fix incorrect handling of nested non-constant values in the FORWARDREF
format in :mod:`annotationlib`.

..

.. date: 2025-04-19-19-58-27
.. gh-issue: 132734
.. nonce: S6F9Cs
.. section: Library

Add new constants for Bluetooth :mod:`sockets <socket>`.

..

.. date: 2025-04-18-14-34-43
.. gh-issue: 132673
.. nonce: 0sliCv
.. section: Library

Fix :exc:`AssertionError` raised on :class:`ctypes.Structure` with ``_align_
= 0`` and ``_fields_ = []``.

..

.. date: 2025-04-18-10-00-09
.. gh-issue: 132578
.. nonce: ruNvF-
.. section: Library

Rename the ``threading.Thread._handle`` field to avoid shadowing methods
defined on subclasses of ``threading.Thread``.

..

.. date: 2025-04-16-11-44-56
.. gh-issue: 132561
.. nonce: ekkDPE
.. section: Library

Fix the public ``locked`` method of ``multiprocessing.SemLock`` class. Also
adding 2 tests for the derivated :class:`multiprocessing.Lock` and
:class:`multiprocessing.RLock` classes.

..

.. date: 2025-04-16-01-41-34
.. gh-issue: 121468
.. nonce: rxgE1z
.. section: Library

Add :func:`pdb.set_trace_async` function to support :keyword:`await`
statements in :mod:`pdb`.

..

.. date: 2025-04-15-08-39-14
.. gh-issue: 132493
.. nonce: V0gLkU
.. section: Library

:class:`typing.Protocol` now uses :func:`annotationlib.get_annotations` when
checking whether or not an instance implements the protocol with
:func:`isinstance`. This enables support for ``isinstance`` checks against
classes with deferred annotations.

..

.. date: 2025-04-15-03-20-00
.. gh-issue: 132536
.. nonce: i5Pvof
.. section: Library

Do not disable :monitoring-event:`PY_THROW` event in :mod:`bdb` because it
can't be disabled.

..

.. date: 2025-04-14-23-00-00
.. gh-issue: 132527
.. nonce: kTi8T7
.. section: Library

Include the valid typecode 'w' in the error message when an invalid typecode
is passed to :class:`array.array`.

..

.. date: 2025-04-14-20-38-43
.. gh-issue: 132099
.. nonce: 0l0LlK
.. section: Library

The Bluetooth socket with the :data:`~socket.BTPROTO_HCI` protocol on Linux
now accepts an address in the format of an integer ``device_id``, not only a
tuple  ``(device_id,)``.

..

.. date: 2025-04-14-17-24-50
.. gh-issue: 81793
.. nonce: OhRTTT
.. section: Library

Fix :func:`os.link` on platforms (like Linux) where the system
:c:func:`!link` function does not follow symlinks. On Linux, it now follows
symlinks by default or if ``follow_symlinks=True`` is specified. On Windows,
it now raises an error if ``follow_symlinks=True`` is passed. On macOS, it
now raises an error if ``follow_symlinks=False`` is passed and the system
:c:func:`!linkat` function is not available at runtime.

..

.. date: 2025-04-13-21-35-50
.. gh-issue: 132493
.. nonce: 5SAQJn
.. section: Library

Support creation of :class:`typing.Protocol` classes with annotations that
cannot be resolved at class creation time.

..

.. date: 2025-04-13-21-22-37
.. gh-issue: 132491
.. nonce: jJfT4e
.. section: Library

Rename ``annotationlib.value_to_string`` to :func:`annotationlib.type_repr`
and provide better handling for function objects.

..

.. date: 2025-04-13-21-11-11
.. gh-issue: 132426
.. nonce: SZno1d
.. section: Library

Add :func:`annotationlib.get_annotate_from_class_namespace` as a helper for
accessing annotations in metaclasses, and remove
``annotationlib.get_annotate_function``.

..

.. date: 2025-04-13-19-17-14
.. gh-issue: 70145
.. nonce: nJ2MKg
.. section: Library

Add support for channels in Bluetooth HCI protocol
(:const:`~socket.BTPROTO_HCI`).

..

.. date: 2025-04-12-19-42-51
.. gh-issue: 131913
.. nonce: twOx7K
.. section: Library

Add a shortcut function :func:`multiprocessing.Process.interrupt` alongside
the existing :func:`multiprocessing.Process.terminate` and
:func:`multiprocessing.Process.kill` for an improved control over child
process termination.

..

.. date: 2025-04-12-16-29-42
.. gh-issue: 132439
.. nonce: 3twrU6
.. section: Library

Fix ``PyREPL`` on Windows: characters entered via AltGr are swallowed. Patch
by Chris Eibl.

..

.. date: 2025-04-12-12-59-51
.. gh-issue: 132429
.. nonce: OEIdlW
.. section: Library

Fix support of Bluetooth sockets on NetBSD and DragonFly BSD. Add support
for *cid* and *bdaddr_type* in the BTPROTO_L2CAP address on FreeBSD. Return
*cid* in ``getsockname()`` for BTPROTO_L2CAP if it is not zero.

..

.. date: 2025-04-12-09-30-24
.. gh-issue: 132106
.. nonce: OxUds3
.. section: Library

:meth:`QueueListener.start <logging.handlers.QueueListener.start>` now
raises a :exc:`RuntimeError` if the listener is already started.

..

.. date: 2025-04-11-21-48-49
.. gh-issue: 132417
.. nonce: uILGdS
.. section: Library

Fix a ``NULL`` pointer dereference when a C function called using
:mod:`ctypes` with ``restype`` :class:`~ctypes.py_object` returns ``NULL``.

..

.. date: 2025-04-11-12-41-47
.. gh-issue: 132385
.. nonce: 86HoA7
.. section: Library

Fix instance error suggestions trigger potential exceptions in
:meth:`object.__getattr__` in :mod:`traceback`.

..

.. date: 2025-04-10-21-43-04
.. gh-issue: 125866
.. nonce: EZ9X8D
.. section: Library

Add optional *add_scheme* argument to :func:`urllib.request.pathname2url`;
when set to true, a complete URL is returned. Likewise add optional
*require_scheme* argument to :func:`~urllib.request.url2pathname`; when set
to true, a complete URL is accepted.

..

.. date: 2025-04-10-13-06-42
.. gh-issue: 132308
.. nonce: 1js5SI
.. section: Library

A :class:`traceback.TracebackException` now correctly renders the
``__context__`` and ``__cause__`` attributes from :ref:`falsey <truth>`
:class:`Exception`, and the ``exceptions`` attribute from falsey
:class:`ExceptionGroup`.

..

.. date: 2025-04-09-19-07-22
.. gh-issue: 130645
.. nonce: cVfE1X
.. section: Library

Add colour to :mod:`argparse` help output. Patch by Hugo van Kemenade.

..

.. date: 2025-04-08-14-50-39
.. gh-issue: 127495
.. nonce: Q0V0bS
.. section: Library

In PyREPL, append a new entry to the ``PYTHON_HISTORY`` file *after* every
statement.  This should preserve command-line history after interpreter is
terminated.  Patch by Sergey B Kirpichev.

..

.. date: 2025-04-08-10-45-22
.. gh-issue: 129463
.. nonce: b1qEP3
.. section: Library

Comparison of :class:`annotationlib.ForwardRef` objects no longer uses the
internal ``__code__`` and ``__ast_node__`` attributes, which are used as
caches.

..

.. date: 2025-04-08-01-55-11
.. gh-issue: 132250
.. nonce: APBFCw
.. section: Library

Fixed the :exc:`SystemError` in :mod:`!cProfile` when locating the actual C
function of a method raises an exception.

..

.. date: 2025-04-06-21-17-14
.. gh-issue: 132064
.. nonce: ktPwDM
.. section: Library

:func:`annotationlib.get_annotations` now uses the ``__annotate__``
attribute if it is present, even if ``__annotations__`` is not present.
Additionally, the function now raises a :py:exc:`TypeError` if it is passed
an object that does not have any annotatins.

..

.. date: 2025-04-06-14-34-29
.. gh-issue: 130664
.. nonce: JF2r-U
.. section: Library

Support the ``'_'`` digit separator in formatting of the integral part of
:class:`~decimal.Decimal`'s.  Patch by Sergey B Kirpichev.

..

.. date: 2025-04-05-16-05-34
.. gh-issue: 131952
.. nonce: HX6gCX
.. section: Library

Add color output to the :program:`json` CLI. Patch by Tomas Roun.

..

.. date: 2025-04-05-15-05-09
.. gh-issue: 132063
.. nonce: KHnslU
.. section: Library

Prevent exceptions that evaluate as falsey (namely, when their ``__bool__``
method returns ``False`` or their ``__len__`` method returns 0) from being
ignored by :class:`concurrent.futures.ProcessPoolExecutor` and
:class:`concurrent.futures.ThreadPoolExecutor`.

..

.. date: 2025-04-05-02-22-49
.. gh-issue: 132106
.. nonce: XMjhQJ
.. section: Library

:class:`logging.handlers.QueueListener` now implements the context manager
protocol, allowing it to be used in a :keyword:`with` statement.

..

.. date: 2025-04-03-20-28-54
.. gh-issue: 132054
.. nonce: c1nlOx
.. section: Library

The ``application/yaml`` mime type (:rfc:`9512`) is now supported by
:mod:`mimetypes`. Patch by Sasha "Nelie" Chernykh and Hugo van Kemenade.

..

.. date: 2025-04-03-17-19-42
.. gh-issue: 119605
.. nonce: c7QXAA
.. section: Library

Respect ``follow_wrapped`` for :meth:`!__init__` and :meth:`!__new__`
methods when getting the class signature for a class with
:func:`inspect.signature`. Preserve class signature after wrapping with
:func:`warnings.deprecated`. Patch by Xuehai Pan.

..

.. date: 2025-04-03-00-56-48
.. gh-issue: 118761
.. nonce: Vb0S1B
.. section: Library

Improve import times by up to 33x for the :mod:`shlex` module, and improve
the performance of :func:`shlex.quote` by up to 12x. Patch by Adam Turner.

..

.. date: 2025-04-01-18-24-58
.. gh-issue: 85302
.. nonce: 7knfUf
.. section: Library

Add support for :data:`~socket.BTPROTO_SCO` in sockets on FreeBSD.

..

.. date: 2025-03-26-10-56-22
.. gh-issue: 131757
.. nonce: pFRdmN
.. section: Library

Make :func:`functools.lru_cache` call the cached function unlocked to allow
concurrency.

..

.. date: 2025-03-23-11-33-09
.. gh-issue: 131423
.. nonce: bQlcEb
.. section: Library

:mod:`ssl` can show descriptions for errors added in OpenSSL 3.4.1. Patch by
Bénédikt Tran.

..

.. date: 2025-03-21-21-24-36
.. gh-issue: 131434
.. nonce: BPkyyh
.. section: Library

Improve error reporting for incorrect format in :func:`time.strptime`.

..

.. date: 2025-03-21-17-34-27
.. gh-issue: 131524
.. nonce: Vj1pO_
.. section: Library

Add help message to :mod:`platform` command-line interface. Contributed by
Harry Lees.

..

.. date: 2025-03-17-23-07-57
.. gh-issue: 100926
.. nonce: B8gcbz
.. section: Library

Move :func:`ctypes.POINTER` types cache from a global internal cache
(``_pointer_type_cache``) to the :attr:`ctypes._CData.__pointer_type__`
attribute of the corresponding :mod:`ctypes` types. This will stop the cache
from growing without limits in some situations.

..

.. date: 2025-03-16-17-40-00
.. gh-issue: 85702
.. nonce: qudq12
.. section: Library

If ``zoneinfo._common.load_tzdata`` is given a package without a resource a
``ZoneInfoNotFoundError`` is raised rather than a :exc:`IsADirectoryError`.

..

.. date: 2025-03-14-14-18-49
.. gh-issue: 123471
.. nonce: sduBKk
.. section: Library

Make concurrent iterations over :class:`itertools.repeat` safe under
free-threading.

..

.. date: 2025-03-11-21-08-46
.. gh-issue: 131127
.. nonce: whcVdY
.. section: Library

Systems using LibreSSL now successfully build.

..

.. date: 2025-03-09-10-37-00
.. gh-issue: 89157
.. nonce: qg3r138
.. section: Library

Make the pure Python implementation of :func:`datetime.date.fromisoformat`,
only accept ASCII strings for consistency with the C implementation.

..

.. date: 2025-03-07-17-47-32
.. gh-issue: 130941
.. nonce: 7_GvhW
.. section: Library

Fix :class:`configparser.ConfigParser` parsing empty interpolation with
``allow_no_value`` set to ``True``.

..

.. date: 2025-03-01-15-00-00
.. gh-issue: 110067
.. nonce: 1ad3as
.. section: Library

Make :mod:`heapq` max-heap functions :func:`heapq.heapify_max`,
:func:`heapq.heappush_max`, :func:`heapq.heappop_max`, and
:func:`heapq.heapreplace_max` public. Previous underscored naming is kept
for backwards compatibility. Additionally, the missing function
:func:`heapq.heappushpop_max` has been added to both the C and Python
implementations.

..

.. date: 2025-03-01-12-37-08
.. gh-issue: 129098
.. nonce: eJ2-6L
.. section: Library

Fix REPL traceback reporting when using :func:`compile` with an inexisting
file. Patch by Bénédikt Tran.

..

.. date: 2025-02-27-14-25-01
.. gh-issue: 130631
.. nonce: dmZcZM
.. section: Library

:func:`!http.cookiejar.join_header_words` is now more similar to the
original Perl version. It now quotes the same set of characters and always
quote values that end with ``"\n"``.

..

.. date: 2025-02-24-12-22-51
.. gh-issue: 130482
.. nonce: p2DrrL
.. section: Library

Add ability to specify name for :class:`!tkinter.OptionMenu` and
:class:`!tkinter.ttk.OptionMenu`.

..

.. date: 2025-02-24-07-08-11
.. gh-issue: 77065
.. nonce: 8uW0Wf
.. section: Library

Add keyword-only optional argument *echo_char* for :meth:`getpass.getpass`
for optional visual keyboard feedback support. Patch by Semyon Moroz.

..

.. date: 2025-02-22-13-07-06
.. gh-issue: 130317
.. nonce: tnxd0I
.. section: Library

Fix :c:func:`PyFloat_Pack2` and :c:func:`PyFloat_Unpack2` for NaN's with
payload.  This corrects round-trip for :func:`struct.unpack` and
:func:`struct.pack` in case of the IEEE 754 binary16 "half precision" type.
Patch by Sergey B Kirpichev.

..

.. date: 2025-02-21-15-46-43
.. gh-issue: 130402
.. nonce: Rwu_KK
.. section: Library

Joining running daemon threads during interpreter shutdown now raises
:exc:`PythonFinalizationError`.

..

.. date: 2025-02-16-06-25-01
.. gh-issue: 130167
.. nonce: kUg7Rc
.. section: Library

Improve speed of :func:`difflib.IS_LINE_JUNK`. Patch by Semyon Moroz.

..

.. date: 2025-02-12-16-37-34
.. gh-issue: 101410
.. nonce: 0GInct
.. section: Library

Added more detailed messages for domain errors in the :mod:`math` module.

..

.. date: 2025-02-11-10-22-11
.. gh-issue: 128384
.. nonce: jyWEkA
.. section: Library

Make :class:`warnings.catch_warnings` use a context variable for holding the
warning filtering state if the :data:`sys.flags.context_aware_warnings` flag
is set to true.  This makes using the context manager thread-safe in
multi-threaded programs.  The flag is true by default in free-threaded
builds and is otherwise false.  The value of the flag can be overridden by
the :option:`-X context_aware_warnings <-X>` command-line option or by
the :envvar:`PYTHON_CONTEXT_AWARE_WARNINGS` environment variable.

..

.. date: 2025-02-06-11-23-51
.. gh-issue: 129719
.. nonce: Of6rvb
.. section: Library

Fix missing :data:`!socket.CAN_RAW_ERR_FILTER` constant in the socket module
on Linux systems. It was missing since Python 3.11.

..

.. date: 2025-01-21-11-48-19
.. gh-issue: 129027
.. nonce: w0vxzZ
.. section: Library

Raise :exc:`DeprecationWarning` for :func:`sys._clear_type_cache`. This
function was deprecated in Python 3.13 but it didn't raise a runtime
warning.

..

.. date: 2024-12-28-11-01-36
.. gh-issue: 128307
.. nonce: BRCYTA
.. section: Library

Add ``eager_start`` keyword argument to :meth:`asyncio.loop.create_task`

..

.. date: 2024-12-21-13-31-55
.. gh-issue: 127604
.. nonce: etL5mf
.. section: Library

Add support for printing the C stack trace on systems that support it via
:func:`faulthandler.dump_c_stack` or via the *c_stack* argument in
:func:`faulthandler.enable`.

..

.. date: 2024-11-29-13-06-52
.. gh-issue: 127385
.. nonce: PErcyB
.. section: Library

Add the ``F_DUPFD_QUERY`` constant to the :mod:`fcntl` module.

..

.. date: 2024-11-14-21-17-48
.. gh-issue: 126838
.. nonce: Yr5vKF
.. section: Library

Add *resolve_host* keyword-only parameter to
:func:`urllib.request.url2pathname`, and fix handling of file URLs with
authorities.

..

.. date: 2024-09-18-09-15-40
.. gh-issue: 82129
.. nonce: GQwt3u
.. section: Library

Fix :exc:`NameError` when calling :func:`typing.get_type_hints` on a
:func:`dataclasses.dataclass` created by :func:`dataclasses.make_dataclass`
with un-annotated fields.

..

.. date: 2024-08-02-20-01-36
.. gh-issue: 122559
.. nonce: 2JlJr3
.. section: Library

Remove :meth:`!__reduce__` and :meth:`!__reduce_ex__` methods that always
raise :exc:`TypeError` in the C implementation of :class:`io.FileIO`,
:class:`io.BufferedReader`, :class:`io.BufferedWriter` and
:class:`io.BufferedRandom` and replace them with default
:meth:`!__getstate__` methods that raise :exc:`!TypeError`. This restores
fine details of behavior of Python 3.11 and older versions.

..

.. date: 2024-07-23-17-08-41
.. gh-issue: 122179
.. nonce: 0jZm9h
.. section: Library

:func:`hashlib.file_digest` now raises :exc:`BlockingIOError` when no data
is available during non-blocking I/O. Before, it added spurious null bytes
to the digest.

..

.. date: 2024-07-19-07-16-50
.. gh-issue: 53032
.. nonce: paXN3p
.. section: Library

Expose :func:`decimal.IEEEContext` to support creation of contexts
corresponding to the IEEE 754 (2008) decimal interchange formats. Patch by
Sergey B Kirpichev.

..

.. date: 2024-06-07-15-03-54
.. gh-issue: 120220
.. nonce: NNxrr_
.. section: Library

Deprecate the :class:`!tkinter.Variable` methods :meth:`!trace_variable`,
:meth:`!trace_vdelete` and :meth:`!trace_vinfo`. Methods :meth:`!trace_add`,
:meth:`!trace_remove` and :meth:`!trace_info` can be used instead.

..

.. date: 2023-12-29-09-44-41
.. gh-issue: 113539
.. nonce: YDkv9O
.. section: Library

:mod:`webbrowser`: Names in the :envvar:`BROWSER` environment variable can
now refer to already registered web browsers, instead of always generating a
new browser command.

This makes it possible to set :envvar:`BROWSER` to the value of one of the
supported browsers on macOS.

..

.. bpo: 44172
.. date: 2021-05-18-19-12-58
.. nonce: rJ_-CI
.. section: Library

Keep a reference to original :mod:`curses` windows in subwindows so that the
original window does not get deleted before subwindows.

..

.. date: 2019-09-10-09-28-52
.. gh-issue: 75223
.. nonce: VyAJS9
.. section: Library

Deprecate undotted extensions in :meth:`mimetypes.MimeTypes.add_type`. Patch
by Hugo van Kemenade.

..

.. date: 2024-11-08-18-07-13
.. gh-issue: 112936
.. nonce: 1Q2RcP
.. section: IDLE

fix IDLE: no Shell menu item in single-process mode.

..

.. date: 2025-03-28-18-25-43
.. gh-issue: 107006
.. nonce: BxFijD
.. section: Documentation

Move documentation and example code for :class:`threading.local` from its
docstring to the official docs.

..

.. date: 2024-10-08-10-44-14
.. gh-issue: 125142
.. nonce: HVlHrs
.. section: Documentation

As part of the builtin help intro text, show the keyboard shortcuts for the
new, non-basic REPL (F1, F2, and F3).

..

.. date: 2025-05-05-15-33-35
.. gh-issue: 133336
.. nonce: miffFi
.. section: Core and Builtins

:option:`!-J` is no longer reserved for use by Jython. Patch by Adam Turner.

..

.. date: 2025-05-05-12-03-46
.. gh-issue: 133261
.. nonce: bL1gqz
.. section: Core and Builtins

Fix bug where the cycle GC could untrack objects in the trashcan because
they looked like they were immortal. When objects are added to the trashcan,
we take care to ensure they keep a mortal reference count.

..

.. date: 2025-05-04-19-46-14
.. gh-issue: 133346
.. nonce: nRXi4f
.. section: Core and Builtins

Added experimental color theming support to the ``_colorize`` module.

..

.. date: 2025-05-04-14-47-26
.. gh-issue: 132917
.. nonce: DrEU1y
.. section: Core and Builtins

For the free-threaded build, check the process memory usage increase before
triggering a full automatic garbage collection.  If the memory used has not
increased 10% since the last collection then defer it.

..

.. date: 2025-05-03-19-04-03
.. gh-issue: 91048
.. nonce: S8QWSw
.. section: Core and Builtins

Add a new ``python -m asyncio ps PID`` command-line interface to inspect
asyncio tasks in a running Python process. Displays a flat table of await
relationships. A variant showing a tree view is also available as ``python
-m asyncio pstree PID``. Both are useful for debugging async code. Patch by
Pablo Galindo, Łukasz Langa, Yury Selivanov, and Marta Gomez Macias.

..

.. date: 2025-05-03-07-41-21
.. gh-issue: 133304
.. nonce: YMuSne
.. section: Core and Builtins

Workaround NaN's "canonicalization" in :c:func:`PyFloat_Pack4` and
:c:func:`PyFloat_Unpack4` on RISC-V.

..

.. date: 2025-05-01-11-06-29
.. gh-issue: 133197
.. nonce: BHjfh4
.. section: Core and Builtins

Improve :exc:`SyntaxError` error messages for incompatible string / bytes
prefixes.

..

.. date: 2025-04-30-19-07-11
.. gh-issue: 133231
.. nonce: H9T8g_
.. section: Core and Builtins

Add new utilities of observing JIT compilation:
:func:`sys._jit.is_available`, :func:`sys._jit.is_enabled`, and
:func:`sys._jit.is_active`.

..

.. date: 2025-04-30-13-09-20
.. gh-issue: 133194
.. nonce: 25_G5c
.. section: Library

:func:`ast.parse` will no longer parse new :pep:`758` syntax with older
*feature_version* passed.

..

.. date: 2025-04-30-00-21-54
.. gh-issue: 131798
.. nonce: D6T5_u
.. section: Core and Builtins

Split ``CALL_LEN`` into several uops allowing the JIT to remove them when
optimizing. Patch by Diego Russo.

..

.. date: 2025-04-26-18-43-31
.. gh-issue: 131798
.. nonce: FsIypo
.. section: Core and Builtins

Use ``sym_new_type`` instead of ``sym_new_not_null`` for _BUILD_STRING,
_BUILD_SET

..

.. date: 2025-04-26-17-50-47
.. gh-issue: 132942
.. nonce: aEEZvZ
.. section: Core and Builtins

Fix two races in the type lookup cache.  This affected the free-threaded
build and could cause crashes (apparently quite difficult to trigger).

..

.. date: 2025-04-26-13-57-13
.. gh-issue: 131798
.. nonce: Gt8CGE
.. section: Core and Builtins

Propagate the return type of ``_BINARY_OP_SUBSCR_TUPLE_INT`` in JIT. Patch
by Tomas Roun

..

.. date: 2025-04-26-08-49-05
.. gh-issue: 132952
.. nonce: ifvP10
.. section: Core and Builtins

Speed up startup with the ``-S`` argument by importing the private ``_io``
module instead of :mod:`io`. This fixes a performance regression introduced
earlier in Python 3.14 development and restores performance to the level of
Python 3.13.

..

.. date: 2025-04-25-14-56-45
.. gh-issue: 131798
.. nonce: NpcKub
.. section: Core and Builtins

Allow the JIT to remove int guards after ``_CALL_LEN`` by setting the return
type to int. Patch by Diego Russo

..

.. date: 2025-04-23-20-54-17
.. gh-issue: 131798
.. nonce: XYlp09
.. section: Core and Builtins

Split ``CALL_TUPLE_1`` into several uops allowing the JIT to remove some of
them. Patch by Tomas Roun

..

.. date: 2025-04-23-20-42-55
.. gh-issue: 131798
.. nonce: wVQ1Gt
.. section: Core and Builtins

Split ``CALL_STR_1`` into several uops allowing the JIT to remove some of
them. Patch by Tomas Roun

..

.. date: 2025-04-23-11-34-39
.. gh-issue: 132825
.. nonce: _yv0uL
.. section: Core and Builtins

Enhance unhashable key/element error messages for :class:`dict` and
:class:`set`. Patch by Victor Stinner.

..

.. date: 2025-04-22-19-00-03
.. gh-issue: 131591
.. nonce: CdEqBr
.. section: Core and Builtins

Reset any :pep:`768` remote debugging pending call in children after
:func:`os.fork` calls.

..

.. date: 2025-04-22-16-38-43
.. gh-issue: 132713
.. nonce: mBWTSZ
.. section: Core and Builtins

Fix ``repr(list)`` race condition: hold a strong reference to the item while
calling ``repr(item)``. Patch by Victor Stinner.

..

.. date: 2025-04-22-15-37-05
.. gh-issue: 132661
.. nonce: XE_A42
.. section: Core and Builtins

Implement :pep:`750` (Template Strings). Add new syntax for t-strings and
implement new internal :class:`!string.templatelib.Template` and
:class:`!string.templatelib.Interpolation` types.

..

.. date: 2025-04-21-09-22-15
.. gh-issue: 132479
.. nonce: CCe2sE
.. section: Core and Builtins

Fix compiler crash in certain circumstances where multiple module-level
annotations include comprehensions and other nested scopes.

..

.. date: 2025-04-21-07-39-59
.. gh-issue: 132747
.. nonce: L-cnej
.. section: Core and Builtins

Fix a crash when calling :meth:`~object.__get__` of a :term:`method` with a
:const:`None` second argument.

..

.. date: 2025-04-20-10-37-39
.. gh-issue: 132744
.. nonce: ArrCp8
.. section: Core and Builtins

Certain calls now check for runaway recursion and respect the system
recursion limit.

..

.. date: 2025-04-19-22-59-24
.. gh-issue: 132449
.. nonce: xjdw4p
.. section: Core and Builtins

Syntax errors that look like misspellings of Python keywords now provide a
helpful fix suggestion for the typo.  Contributed by Pablo Galindo Salgado.

..

.. date: 2025-04-19-18-07-34
.. gh-issue: 132737
.. nonce: 9mW1il
.. section: Library

Support profiling code that requires ``__main__``, such as :mod:`pickle`.

..

.. date: 2025-04-17-16-20-03
.. gh-issue: 132639
.. nonce: zRVYU3
.. section: Core and Builtins

Added :c:func:`PyLong_AsNativeBytes`, :c:func:`PyLong_FromNativeBytes` and
:c:func:`PyLong_FromUnsignedNativeBytes` to the limited C API.

..

.. date: 2025-04-17-11-40-13
.. gh-issue: 100239
.. nonce: 9RxIxY
.. section: Core and Builtins

Add specialisation for ``BINARY_OP/SUBSCR`` on list and slice.

..

.. date: 2025-04-15-10-09-49
.. gh-issue: 132508
.. nonce: zVe3iI
.. section: Core and Builtins

Uses tagged integers on the evaluation stack to represent the instruction
offsets when reraising an exception. This avoids the need to box the integer
which could fail in low memory conditions.

..

.. date: 2025-04-13-17-18-01
.. gh-issue: 124476
.. nonce: fvGfQ7
.. section: Core and Builtins

Fix decoding from the locale encoding in the C.UTF-8 locale.

..

.. date: 2025-04-13-10-34-27
.. gh-issue: 131927
.. nonce: otp80n
.. section: Core and Builtins

Compiler warnings originating from the same module and line number are now
only emitted once, matching the behaviour of warnings emitted from user
code. This can also be configured with :mod:`warnings` filters.

..

.. date: 2025-04-13-01-50-40
.. gh-issue: 132457
.. nonce: 1q-1xz
.. section: Core and Builtins

Make :func:`staticmethod` and :func:`classmethod` generic.

..

.. date: 2025-04-12-19-41-16
.. gh-issue: 131798
.. nonce: JkSocg
.. section: Core and Builtins

Use ``sym_new_type`` instead of ``sym_new_not_null`` for _BUILD_LIST,
_BUILD_SET, _BUILD_MAP

..

.. date: 2025-04-11-22-01-07
.. gh-issue: 131798
.. nonce: TTu_xH
.. section: Core and Builtins

Split ``CALL_TYPE_1`` into several uops allowing the JIT to remove some of
them.

..

.. date: 2025-04-11-18-46-37
.. gh-issue: 132386
.. nonce: pMBFTe
.. section: Core and Builtins

Fix crash when passing a dict subclass as the ``globals`` parameter to
:func:`exec`.

..

.. date: 2025-04-10-10-29-45
.. gh-issue: 127682
.. nonce: X0HoGz
.. section: Core and Builtins

No longer call ``__iter__`` twice when creating and executing a generator
expression. Creating a generator expression from a non-interable will raise
only when the generator expression is executed. This brings the behavior of
generator expressions in line with other generators.

..

.. date: 2025-04-09-21-51-37
.. gh-issue: 132261
.. nonce: gL8thm
.. section: Core and Builtins

The internal storage for annotations and annotate functions on classes now
uses different keys in the class dictionary. This eliminates various edge
cases where access to the ``__annotate__`` and ``__annotations__``
attributes would behave unpredictably.

..

.. date: 2025-04-09-20-49-04
.. gh-issue: 132284
.. nonce: TxTNka
.. section: Core and Builtins

Don't wrap base ``PyCFunction`` slots on class creation if not overridden.

..

.. date: 2025-04-09-14-05-54
.. gh-issue: 130415
.. nonce: llQtUq
.. section: Core and Builtins

Improve the JIT's ability to remove unused constant and local variable
loads, and fix an issue where deallocating unused values could cause JIT
code to crash or behave incorrectly.

..

.. date: 2025-04-09-13-47-33
.. gh-issue: 126703
.. nonce: kXiQHj
.. section: Core and Builtins

Fix possible use after free in cases where a method's definition has the
same lifetime as its ``self``.

..

.. date: 2025-04-09-12-37-31
.. gh-issue: 132286
.. nonce: 1ZdsOa
.. section: Core and Builtins

Fix that :attr:`type.__annotate__` was not deleted, when
:attr:`type.__annotations__` was deleted.

..

.. date: 2025-04-08-21-20-12
.. gh-issue: 131798
.. nonce: Ft9tIF
.. section: Core and Builtins

Allow the JIT to remove an extra ``_TO_BOOL_BOOL`` instruction after
``_CONTAINS_OP_DICT`` by setting the return type to bool.

..

.. date: 2025-04-08-17-48-11
.. gh-issue: 124715
.. nonce: xxzQoD
.. section: Core and Builtins

Prevents against stack overflows when calling :c:func:`Py_DECREF`.
Third-party extension objects no longer need to use the "trashcan"
mechanism, as protection is now built into the :c:func:`Py_DECREF` macro.

..

.. date: 2025-04-08-09-20-18
.. gh-issue: 131798
.. nonce: Xp1mvN
.. section: Core and Builtins

Allow the JIT compiler to remove some type checks for operations on lists,
tuples, dictionaries, and sets.

..

.. date: 2025-04-07-13-46-57
.. gh-issue: 128398
.. nonce: gJ2zIF
.. section: Core and Builtins

Improve error message when an object supporting the synchronous (resp.
asynchronous) context manager protocol is entered using :keyword:`async
with` (resp. :keyword:`with`) instead of :keyword:`with` (resp.
:keyword:`async with`). Patch by Bénédikt Tran.

..

.. date: 2025-04-06-13-17-10
.. gh-issue: 131798
.. nonce: uMrfha
.. section: Core and Builtins

Allow the JIT to remove unicode guards after ``_BINARY_OP_SUBSCR_STR_INT``
by setting the return type to string.

..

.. date: 2025-03-30-19-58-14
.. gh-issue: 131878
.. nonce: uxM26H
.. section: Core and Builtins

Handle uncaught exceptions in the main input loop for the new REPL.

..

.. date: 2025-03-30-19-49-00
.. gh-issue: 131878
.. nonce: J8_cHB
.. section: Core and Builtins

Fix support of unicode characters with two or more codepoints on Windows in
the new REPL.

..

.. date: 2025-03-28-15-06-55
.. gh-issue: 126835
.. nonce: IpcMTn
.. section: Core and Builtins

Move constant folding to the peephole optimizer. Rename AST optimization
related files (Python/ast_opt.c -> Python/ast_preprocess.c), structs
(_PyASTOptimizeState -> _PyASTPreprocessState) and functions
(_PyAST_Optimize -> _PyAST_Preprocess, _PyCompile_AstOptimize ->
_PyCompile_AstPreprocess).

..

.. date: 2025-03-26-04-55-25
.. gh-issue: 114809
.. nonce: 8rNyT7
.. section: Core and Builtins

Add support for macOS multi-arch builds with the JIT enabled

..

.. date: 2025-03-21-19-03-42
.. gh-issue: 131507
.. nonce: q9fvyM
.. section: Core and Builtins

PyREPL now supports syntax highlighting. Contributed by Łukasz Langa.

..

.. date: 2025-03-21-08-47-36
.. gh-issue: 130907
.. nonce: rGg-ge
.. section: Core and Builtins

If the ``__annotations__`` of a module object are accessed while the module
is executing, return the annotations that have been defined so far, without
caching them.

..

.. date: 2025-02-18-11-42-58
.. gh-issue: 130104
.. nonce: BOicVZ
.. section: Core and Builtins

Three-argument :func:`pow` now try calling :meth:`~object.__rpow__` if
necessary. Previously it was only called in two-argument :func:`!pow` and
the binary power operator.

..

.. date: 2025-02-13-05-09-31
.. gh-issue: 130070
.. nonce: C8c9gK
.. section: Core and Builtins

Fixed an assertion error for :func:`exec` passed a string ``source`` and a
non-``None`` ``closure``. Patch by Bartosz Sławecki.

..

.. date: 2025-02-13-00-14-24
.. gh-issue: 129958
.. nonce: Uj7lyY
.. section: Core and Builtins

Fix a bug that was allowing newlines inconsistently in format specifiers for
single-quoted f-strings. Patch by Pablo Galindo.

..

.. date: 2025-02-12-01-36-13
.. gh-issue: 129858
.. nonce: M-f7Gb
.. section: Core and Builtins

``elif`` statements that follow an ``else`` block now have a specific error
message.

..

.. date: 2025-01-26-23-46-43
.. gh-issue: 69605
.. nonce: _2Qc1w
.. section: Core and Builtins

Add module autocomplete to PyREPL.

..

.. date: 2025-01-06-10-55-41
.. gh-issue: 128555
.. nonce: tAK_AY
.. section: Core and Builtins

Add the :data:`sys.flags.thread_inherit_context` flag.

* This flag is set to true by default on the free-threaded build
  and false otherwise.  If the flag is true, starting a new thread using
  :class:`threading.Thread` will, by default, use a copy of the
  :class:`contextvars.Context` from the caller of
  :meth:`threading.Thread.start` rather than using an empty context.

* Add the :option:`-X thread_inherit_context <-X>` command-line option and
  :envvar:`PYTHON_THREAD_INHERIT_CONTEXT` environment variable, which set the
  :data:`~sys.flags.thread_inherit_context` flag.

* Add the ``context`` keyword parameter to :class:`~threading.Thread`.  It can
  be used to explicitly pass a context value to be used by a new thread.

* Make the ``_contextvars`` module built-in.

..

.. date: 2024-09-03-15-15-51
.. gh-issue: 123539
.. nonce: RKQS0S
.. section: Core and Builtins

Improve :exc:`SyntaxError` message for using ``import ... as`` and ``from
... import ... as`` with not a name.

..

.. date: 2024-07-11-12-31-29
.. gh-issue: 102567
.. nonce: weRqDn
.. section: Core and Builtins

:option:`-X importtime <-X>` now accepts value ``2``, which indicates that
an ``importtime`` entry should also be printed if an imported module has
already been loaded. Patch by Noah Kim and Adam Turner.

..

.. date: 2024-03-06-22-33-33
.. gh-issue: 116436
.. nonce: y8Thkt
.. section: Core and Builtins

Improve error message when :exc:`TypeError` occurs during
:meth:`dict.update`

..

.. date: 2023-04-29-23-15-38
.. gh-issue: 103997
.. nonce: BS3uVt
.. section: Core and Builtins

String arguments passed to "-c" are now automatically dedented.
This allows "python -c" invocations to be indented
in shell scripts without causing indentation errors. (Patch by Jon Crall and
Steven Sun)

..

.. date: 2022-12-29-19-10-36
.. gh-issue: 89562
.. nonce: g8m8RC
.. section: Library

Remove ``hostflags`` member from ``PySSLContext`` struct.

..

.. date: 2025-05-01-01-02-11
.. gh-issue: 133166
.. nonce: Ly9Ae2
.. section: C API

Fix regression where :c:func:`PyType_GetModuleByDef` returns NULL without
setting :exc:`TypeError` when a static type is passed.

..

.. date: 2025-04-29-19-39-16
.. gh-issue: 133164
.. nonce: W-XTU7
.. section: C API

Add :c:func:`PyUnstable_Object_IsUniqueReferencedTemporary` function for
determining if an object exists as a unique temporary variable on the
interpreter's stack.  This is a replacement for some cases where checking
that :c:func:`Py_REFCNT` is one is no longer sufficient to determine if it's
safe to modify a Python object in-place with no visible side effects.

..

.. date: 2025-04-29-06-27-46
.. gh-issue: 133140
.. nonce: IPGGc3
.. section: C API

Add :c:func:`PyUnstable_Object_IsUniquelyReferenced` as a replacement for
``Py_REFNCT(op) == 1`` on :term:`free threaded <free threading>` builds of
Python.

..

.. date: 2025-04-28-18-26-37
.. gh-issue: 131747
.. nonce: 2AiQ9n
.. section: C API

On non-Windows platforms, deprecate using :attr:`ctypes.Structure._pack_` to
use a Windows-compatible layout on non-Windows platforms. The layout should
be specified explicitly by setting :attr:`ctypes.Structure._layout_` to
``'ms'``.

..

.. date: 2025-04-28-15-36-01
.. gh-issue: 128972
.. nonce: 8bZMIm
.. section: C API

For non-free-threaded builds, the memory layout of :c:struct:`PyASCIIObject`
is reverted to match Python 3.13. (Note that the structure is not part of
stable ABI and so its memory layout is *guaranteed* to remain stable.)

..

.. date: 2025-04-28-13-27-48
.. gh-issue: 133079
.. nonce: DJL2sK
.. section: C API

The undocumented APIs :c:macro:`!Py_C_RECURSION_LIMIT` and
:c:member:`!PyThreadState.c_recursion_remaining`, added in 3.13, are removed
without a deprecation period.

..

.. date: 2025-04-26-12-00-52
.. gh-issue: 132987
.. nonce: vykZGN
.. section: C API

The ``k`` and ``K`` formats in :c:func:`PyArg_Parse` now support the
:meth:`~object.__index__` special method, like all other integer formats.

..

.. date: 2025-04-25-11-39-24
.. gh-issue: 132909
.. nonce: JC3n_l
.. section: C API

Fix an overflow when handling the :ref:`K <capi-py-buildvalue-format-K>`
format in :c:func:`Py_BuildValue`. Patch by Bénédikt Tran.

..

.. date: 2025-04-22-13-59-30
.. gh-issue: 132798
.. nonce: asfafhs
.. section: C API

Deprecated and undocumented functions :c:func:`!PyUnicode_AsEncodedObject`,
:c:func:`!PyUnicode_AsDecodedObject`, :c:func:`!PyUnicode_AsEncodedUnicode`
and :c:func:`!PyUnicode_AsDecodedUnicode` are scheduled for removal in 3.15.

..

.. date: 2025-04-13-20-52-39
.. gh-issue: 132470
.. nonce: UqBQjN
.. section: C API

Creating a :class:`ctypes.CField` with a *byte_size* that does not match the
actual type size now raises a :exc:`ValueError` instead of crashing the
interpreter.

..

.. date: 2025-01-08-18-55-57
.. gh-issue: 112068
.. nonce: ofI5Fl
.. section: C API

[Reverted in :gh:`136991`] Add support of nullable arguments in :c:func:`PyArg_Parse` and similar
functions. Adding ``?`` after any format unit makes ``None`` be accepted as
a value.

..

.. date: 2024-12-31-15-28-14
.. gh-issue: 50333
.. nonce: KxQUXa
.. section: C API

Non-tuple sequences are deprecated as argument for the ``(items)`` format
unit in :c:func:`PyArg_ParseTuple` and other :ref:`argument parsing
<arg-parsing>` functions if *items* contains format units which store a
:ref:`borrowed buffer <c-arg-borrowed-buffer>` or a :term:`borrowed
reference`.

..

.. date: 2025-05-01-17-27-06
.. gh-issue: 113464
.. nonce: vjE5X4
.. section: Build

Use the cpython-bin-deps "externals" repository for Windows LLVM dependency
management. Installing LLVM manually is no longer necessary for Windows JIT
builds.

..

.. date: 2025-04-30-11-07-53
.. gh-issue: 133183
.. nonce: zCKUeQ
.. section: Build

iOS compiler shims now include ``IPHONEOS_DEPLOYMENT_TARGET`` in target
triples, ensuring that SDK version minimums are honored.

..

.. date: 2025-04-30-10-23-18
.. gh-issue: 133167
.. nonce: E0jrYJ
.. section: Build

Fix compilation process with ``--enable-optimizations`` and
``--without-docstrings``.

..

.. date: 2025-04-29-15-29-11
.. gh-issue: 133171
.. nonce: YbwbwP
.. section: Build

Since free-threaded builds do not support the experimental JIT compiler,
prevent these configurations from being combined.

..

.. date: 2025-04-20-20-07-44
.. gh-issue: 132758
.. nonce: N2a3wp
.. section: Build

Fix building with tail call interpreter and pystats.

..

.. date: 2025-04-17-19-10-15
.. gh-issue: 132649
.. nonce: DZqGoq
.. section: Build

The :file:`PC\layout` script now allows passing ``--include-tcltk`` on
Windows ARM64.

..

.. date: 2025-04-08-09-11-32
.. gh-issue: 132257
.. nonce: oZWBV-
.. section: Build

Change the default LTO flags on GCC to not pass ``-flto-partition=none``,
and allow parallelization of LTO. For newer GNU makes and GCC, this has a
multiple factor speedup for LTO build times, with no noticeable loss in
performance.

..

.. date: 2025-04-02-21-08-36
.. gh-issue: 132026
.. nonce: ptnR7T
.. section: Build

Fix use of undefined identifiers in platform triplet detection on MIPS Linux
platforms.