cpython/Misc/NEWS.d/3.14.0a3.rst

.. date: 2024-11-28-15-55-48
.. gh-issue: 127353
.. nonce: i-XOXg
.. release date: 2024-12-17
.. section: Windows

Allow to force color output on Windows using environment variables. Patch by
Andrey Efremov.

..

.. date: 2024-10-31-09-46-53
.. gh-issue: 125729
.. nonce: KdKVLa
.. section: Windows

Makes the presence of the :mod:`turtle` module dependent on the Tcl/Tk
installer option. Previously, the module was always installed but would be
unusable without Tcl/Tk.

..

.. date: 2024-11-16-20-47-20
.. gh-issue: 126700
.. nonce: ayrHv4
.. section: Tools/Demos

Add support for multi-argument :mod:`gettext` functions in
:program:`pygettext.py`.

..

.. date: 2024-12-13-13-41-34
.. gh-issue: 127906
.. nonce: NuRHlB
.. section: Tests

Test the limited C API in test_cppext. Patch by Victor Stinner.

..

.. date: 2024-12-09-12-35-44
.. gh-issue: 127637
.. nonce: KLx-9I
.. section: Tests

Add tests for the :mod:`dis` command-line interface. Patch by Bénédikt Tran.

..

.. date: 2024-12-04-15-03-24
.. gh-issue: 126925
.. nonce: uxAMK-
.. section: Tests

iOS test results are now streamed during test execution, and the deprecated
xcresulttool is no longer used.

..

.. date: 2024-11-21-02-03-48
.. gh-issue: 127076
.. nonce: a3avV1
.. section: Tests

Disable strace based system call tests when LD_PRELOAD is set.

..

.. date: 2024-11-20-18-49-01
.. gh-issue: 127076
.. nonce: DHnXxo
.. section: Tests

Filter out memory-related ``mmap``, ``munmap``, and ``mprotect``  calls from
file-related ones when testing :mod:`io` behavior using strace.

..

.. date: 2024-12-05-21-35-19
.. gh-issue: 127655
.. nonce: xpPoOf
.. section: Security

Fixed the :class:`!asyncio.selector_events._SelectorSocketTransport`
transport not pausing writes for the protocol when the buffer reaches the
high water mark when using :meth:`asyncio.WriteTransport.writelines`.

..

.. date: 2024-12-13-22-20-54
.. gh-issue: 126907
.. nonce: fWRL_R
.. section: Library

Fix crash when using :mod:`atexit` concurrently on the :term:`free-threaded
<free threading>` build.

..

.. date: 2024-12-12-16-59-42
.. gh-issue: 127870
.. nonce: _NFG-3
.. section: Library

Detect recursive calls in ctypes ``_as_parameter_`` handling. Patch by
Victor Stinner.

..

.. date: 2024-12-08-08-36-18
.. gh-issue: 127732
.. nonce: UEKxoa
.. section: Library

The :mod:`platform` module now correctly detects Windows Server 2025.

..

.. date: 2024-12-07-23-06-44
.. gh-issue: 126789
.. nonce: 4dqfV1
.. section: Library

Fixed :func:`sysconfig.get_config_vars`, :func:`sysconfig.get_paths`, and
siblings, returning outdated cached data if the value  of :data:`sys.prefix`
or :data:`sys.exec_prefix` changes. Overwriting :data:`sys.prefix` or
:data:`sys.exec_prefix` still is discouraged, as that might break other
parts of the code.

..

.. date: 2024-12-07-15-28-31
.. gh-issue: 127718
.. nonce: 9dpLfi
.. section: Library

Add colour to :mod:`test.regrtest` output. Patch by Hugo van Kemenade.

..

.. date: 2024-12-06-17-28-55
.. gh-issue: 127610
.. nonce: ctv_NP
.. section: Library

Added validation for more than one var-positional or var-keyword parameters
in :class:`inspect.Signature`. Patch by Maxim Ageev.

..

.. date: 2024-12-05-10-14-52
.. gh-issue: 127627
.. nonce: fgCHOZ
.. section: Library

Added ``posix._emscripten_debugger()`` to help with debugging the test suite
on the Emscripten target.

..

.. date: 2024-12-04-15-04-12
.. gh-issue: 126821
.. nonce: lKCLVV
.. section: Library

macOS and iOS apps can now choose to redirect stdout and stderr to the
system log during interpreter configuration.

..

.. date: 2024-12-04-11-01-16
.. gh-issue: 93312
.. nonce: 9sB-Qw
.. section: Library

Include ``<sys/pidfd.h>`` to get ``os.PIDFD_NONBLOCK`` constant. Patch by
Victor Stinner.

..

.. date: 2024-12-01-23-18-43
.. gh-issue: 127481
.. nonce: K36AoP
.. section: Library

Add the ``EPOLLWAKEUP`` constant to the :mod:`select` module.

..

.. date: 2024-12-01-22-28-41
.. gh-issue: 127065
.. nonce: tFpRer
.. section: Library

Make :func:`operator.methodcaller` thread-safe and re-entrant safe.

..

.. date: 2024-11-30-21-46-15
.. gh-issue: 127321
.. nonce: M78fBv
.. section: Library

:func:`pdb.set_trace` will not stop at an opcode that does not have an
associated line number anymore.

..

.. date: 2024-11-29-23-02-43
.. gh-issue: 127429
.. nonce: dQf2w4
.. section: Library

Fixed bug where, on cross-builds, the :mod:`sysconfig` POSIX data was being
generated with the host Python's ``Makefile``. The data is now generated
from current build's ``Makefile``.

..

.. date: 2024-11-29-14-45-26
.. gh-issue: 127413
.. nonce: z11AUc
.. section: Library

Add the :option:`dis --specialized` command-line option to show specialized
bytecode. Patch by Bénédikt Tran.

..

.. date: 2024-11-29-00-15-59
.. gh-issue: 125413
.. nonce: WCN0vv
.. section: Library

Revert addition of :meth:`!pathlib.Path.scandir`. This method was added in
3.14.0a2. The optimizations remain for file system paths, but other
subclasses should only have to implement :meth:`pathlib.Path.iterdir`.

..

.. date: 2024-11-28-14-14-46
.. gh-issue: 127257
.. nonce: n6-jU9
.. section: Library

In :mod:`ssl`, system call failures that OpenSSL reports using
``ERR_LIB_SYS`` are now raised as :exc:`OSError`.

..

.. date: 2024-11-27-17-04-38
.. gh-issue: 59705
.. nonce: sAGyvs
.. section: Library

On Linux, :class:`threading.Thread` now sets the thread name to the
operating system. Patch by Victor Stinner.

..

.. date: 2024-11-27-16-06-10
.. gh-issue: 127303
.. nonce: asqkgh
.. section: Library

Publicly expose :data:`~token.EXACT_TOKEN_TYPES` in :attr:`!token.__all__`.

..

.. date: 2024-11-27-14-23-02
.. gh-issue: 127331
.. nonce: 9sNEC9
.. section: Library

:mod:`ssl` can show descriptions for errors added in OpenSSL 3.4.

..

.. date: 2024-11-27-14-06-35
.. gh-issue: 123967
.. nonce: wxUmnW
.. section: Library

Fix faulthandler for trampoline frames. If the top-most frame is a
trampoline frame, skip it. Patch by Victor Stinner.

..

.. date: 2024-11-26-17-42-00
.. gh-issue: 127178
.. nonce: U8hxjc
.. section: Library

A ``_sysconfig_vars_(...).json`` file is now shipped in the standard library
directory. It contains the output of :func:`sysconfig.get_config_vars` on
the default environment encoded as JSON data. This is an implementation
detail, and may change at any time.

..

.. date: 2024-11-25-19-04-10
.. gh-issue: 127072
.. nonce: -c284K
.. section: Library

Remove outdated ``socket.NETLINK_*`` constants not present in Linux kernels
beyond 2.6.17.

..

.. date: 2024-11-25-15-02-44
.. gh-issue: 127255
.. nonce: UXeljc
.. section: Library

The :func:`~ctypes.CopyComPointer` function is now public. Previously, this
was private and only available in ``_ctypes``.

..

.. date: 2024-11-24-14-20-17
.. gh-issue: 127182
.. nonce: WmfY2g
.. section: Library

Fix :meth:`!io.StringIO.__setstate__` crash, when :const:`None` was passed
as the first value.

..

.. date: 2024-11-24-12-41-31
.. gh-issue: 127217
.. nonce: UAXGFr
.. section: Library

Fix :func:`urllib.request.pathname2url` for paths starting with multiple
slashes on Posix.

..

.. date: 2024-11-23-12-25-06
.. gh-issue: 125866
.. nonce: wEOP66
.. section: Library

:func:`urllib.request.pathname2url` now adds an empty authority when
generating a URL for a path that begins with exactly one slash. For example,
the path ``/etc/hosts`` is converted to the scheme-less URL
``///etc/hosts``. As a result of this change, URLs without authorities are
only generated for relative paths.

..

.. date: 2024-11-23-00-17-29
.. gh-issue: 127221
.. nonce: OSXdFE
.. section: Library

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

..

.. date: 2024-11-22-10-42-34
.. gh-issue: 127035
.. nonce: UnbDlr
.. section: Library

Fix :mod:`shutil.which` on Windows. Now it looks at direct match if and only
if the command ends with a PATHEXT extension or X_OK is not in mode. Support
extensionless files if "." is in PATHEXT. Support PATHEXT extensions that
end with a dot.

..

.. date: 2024-11-22-09-23-41
.. gh-issue: 122273
.. nonce: H8M6fd
.. section: Library

Support PyREPL history on Windows. Patch by devdanzin and Victor Stinner.

..

.. date: 2024-11-22-04-49-31
.. gh-issue: 125866
.. nonce: TUtvPK
.. section: Library

:func:`urllib.request.pathname2url` and :func:`~urllib.request.url2pathname`
no longer convert Windows drive letters to uppercase.

..

.. date: 2024-11-22-03-40-02
.. gh-issue: 127078
.. nonce: gI_PaP
.. section: Library

Fix issue where :func:`urllib.request.url2pathname` failed to discard an
extra slash before a UNC drive in the URL path on Windows.

..

.. date: 2024-11-22-02-31-55
.. gh-issue: 126766
.. nonce: jfkhBH
.. section: Library

Fix issue where :func:`urllib.request.url2pathname` failed to discard any
'localhost' authority present in the URL.

..

.. date: 2024-11-21-16-23-16
.. gh-issue: 127065
.. nonce: cfL1zd
.. section: Library

Fix crash when calling a :func:`operator.methodcaller` instance from
multiple threads in the free threading build.

..

.. date: 2024-11-21-06-03-46
.. gh-issue: 127090
.. nonce: yUYwdh
.. section: Library

Fix value of :attr:`urllib.response.addinfourl.url` for ``file:`` URLs that
express relative paths and absolute Windows paths. The canonical URL
generated by :func:`urllib.request.pathname2url` is now used.

..

.. date: 2024-11-20-21-20-56
.. gh-issue: 126992
.. nonce: RbU0FZ
.. section: Library

Fix LONG and INT opcodes to only use base 10 for string to integer
conversion in :mod:`pickle`.

..

.. date: 2024-11-20-16-58-59
.. gh-issue: 126997
.. nonce: 0PI41Y
.. section: Library

Fix support of STRING and GLOBAL opcodes with non-ASCII arguments in
:mod:`pickletools`. :func:`pickletools.dis` now outputs non-ASCII bytes in
STRING, BINSTRING and SHORT_BINSTRING arguments as escaped (``\xXX``).

..

.. date: 2024-11-20-11-37-08
.. gh-issue: 126316
.. nonce: ElkZmE
.. section: Library

:mod:`grp`: Make :func:`grp.getgrall` thread-safe by adding a mutex. Patch
by Victor Stinner.

..

.. date: 2024-11-20-08-54-11
.. gh-issue: 126618
.. nonce: ef_53g
.. section: Library

Fix the representation of :class:`itertools.count` objects when the count
value is :data:`sys.maxsize`.

..

.. date: 2024-11-19-14-34-05
.. gh-issue: 126615
.. nonce: LOskwi
.. section: Library

The :exc:`~ctypes.COMError` exception is now public. Previously, this was
private and only available in ``_ctypes``.

..

.. date: 2024-11-18-23-42-06
.. gh-issue: 126985
.. nonce: 7XplY9
.. section: Library

When running under a virtual environment with the :mod:`site` disabled (see
:option:`-S`), :data:`sys.prefix` and :data:`sys.base_prefix` will now point
to the virtual environment, instead of the base installation.

..

.. date: 2024-11-18-23-18-27
.. gh-issue: 112192
.. nonce: DRdRgP
.. section: Library

In the :mod:`trace` module, increase the coverage precision (``cov%``) to
one decimal.

..

.. date: 2024-11-18-22-02-47
.. gh-issue: 118761
.. nonce: GQKD_J
.. section: Library

Improve import time of :mod:`mimetypes` by around 11-16 times. Patch by Hugo
van Kemenade.

..

.. date: 2024-11-18-19-03-46
.. gh-issue: 126947
.. nonce: NiDYUe
.. section: Library

Raise :exc:`TypeError` in :meth:`!_pydatetime.timedelta.__new__` if the
passed arguments are not :class:`int` or :class:`float`, so that the Python
implementation is in line with the C implementation.

..

.. date: 2024-11-18-16-43-11
.. gh-issue: 126946
.. nonce: 52Ou-B
.. section: Library

Improve the :exc:`~getopt.GetoptError` error message when a long option
prefix matches multiple accepted options in :func:`getopt.getopt` and
:func:`getopt.gnu_getopt`.

..

.. date: 2024-11-16-10-52-48
.. gh-issue: 126899
.. nonce: GFnfBt
.. section: Library

Make tkinter widget methods :meth:`!after` and :meth:`!after_idle` accept
arguments passed by keyword.

..

.. date: 2024-11-15-01-50-36
.. gh-issue: 85168
.. nonce: bP8VIN
.. section: Library

Fix issue where :func:`urllib.request.url2pathname` and
:func:`~urllib.request.pathname2url` always used UTF-8 when quoting and
unquoting file URIs. They now use the :term:`filesystem encoding and error
handler`.

..

.. date: 2024-11-13-19-15-18
.. gh-issue: 126780
.. nonce: ZZqJvI
.. section: Library

Fix :func:`os.path.normpath` for drive-relative paths on Windows.

..

.. date: 2024-11-13-10-44-25
.. gh-issue: 126775
.. nonce: a3ubjh
.. section: Library

Make :func:`linecache.checkcache` thread safe and GC re-entrancy safe.

..

.. date: 2024-11-12-20-05-09
.. gh-issue: 126601
.. nonce: Nj7bA9
.. section: Library

Fix issue where :func:`urllib.request.pathname2url` raised :exc:`OSError`
when given a Windows path containing a colon character not following a drive
letter, such as before an NTFS alternate data stream.

..

.. date: 2024-11-12-13-14-47
.. gh-issue: 126727
.. nonce: 5Eqfqd
.. section: Library

``locale.nl_langinfo(locale.ERA)`` now returns multiple era description
segments separated by semicolons. Previously it only returned the first
segment on platforms with Glibc.

..

.. date: 2024-11-04-22-02-30
.. gh-issue: 85046
.. nonce: Y5d_ZN
.. section: Library

Add :data:`~errno.EHWPOISON` error code to :mod:`errno`.

..

.. date: 2024-10-28-19-49-18
.. gh-issue: 118201
.. nonce: v41XXh
.. section: Library

Fixed intermittent failures of :any:`os.confstr`, :any:`os.pathconf` and
:any:`os.sysconf` on iOS and Android.

..

.. date: 2024-10-23-20-05-54
.. gh-issue: 86463
.. nonce: jvFTI_
.. section: Library

The ``usage`` parameter of :class:`argparse.ArgumentParser` no longer
affects the default value of the ``prog`` parameter in subparsers.

..

.. date: 2024-09-13-18-24-27
.. gh-issue: 124008
.. nonce: XaiPQx
.. section: Library

Fix possible crash (in debug build), incorrect output or returning incorrect
value from raw binary ``write()`` when writing to console on Windows.

..

.. date: 2024-08-27-18-58-01
.. gh-issue: 123401
.. nonce: t4-FpI
.. section: Library

The :mod:`http.cookies` module now supports parsing obsolete :rfc:`850` date
formats, in accordance with :rfc:`9110` requirements. Patch by Nano Zheng.

..

.. date: 2024-07-30-11-37-40
.. gh-issue: 122431
.. nonce: lAzVtu
.. section: Library

:func:`readline.append_history_file` now raises a :exc:`ValueError` when
given a negative value.

..

.. date: 2024-07-29-15-20-30
.. gh-issue: 122356
.. nonce: wKCmFx
.. section: Library

Guarantee that the position of a file-like object passed to
:func:`zipfile.is_zipfile` is left untouched after the call. Patch by
Bénédikt Tran.

..

.. date: 2024-07-25-18-06-51
.. gh-issue: 122288
.. nonce: -_xxOR
.. section: Library

Improve the performances of :func:`fnmatch.translate` by a factor 1.7. Patch
by Bénédikt Tran.

..

.. date: 2023-02-15-23-54-42
.. gh-issue: 88110
.. nonce: KU6erv
.. section: Library

Fixed :class:`multiprocessing.Process` reporting a ``.exitcode`` of 1 even
on success when using the ``"fork"`` start method while using a
:class:`concurrent.futures.ThreadPoolExecutor`.

..

.. date: 2022-11-10-17-16-45
.. gh-issue: 97514
.. nonce: kzA0zl
.. section: Library

Authentication was added to the :mod:`multiprocessing` forkserver start
method control socket so that only processes with the authentication key
generated by the process that spawned the forkserver can control it.  This
is an enhancement over the other :gh:`97514` fixes so that access is no
longer limited only by filesystem permissions.

The file descriptor exchange of control pipes with the forked worker process
now requires an explicit acknowledgement byte to be sent over the socket
after the exchange on all forkserver supporting platforms. That makes
testing the above much easier.

..

.. date: 2024-11-27-22-56-48
.. gh-issue: 127347
.. nonce: xyddWS
.. section: Documentation

Publicly expose :func:`traceback.print_list` in :attr:`!traceback.__all__`.

..

.. date: 2024-12-10-21-08-05
.. gh-issue: 127740
.. nonce: 0tWC9h
.. section: Core and Builtins

Fix error message in :func:`bytes.fromhex` when given an odd number of
digits to properly indicate that an even number of hexadecimal digits is
required.

..

.. date: 2024-12-09-11-29-10
.. gh-issue: 127058
.. nonce: pqtBcZ
.. section: Core and Builtins

``PySequence_Tuple`` now creates the resulting tuple atomically, preventing
partially created tuples being visible to the garbage collector or through
``gc.get_referrers()``

..

.. date: 2024-12-07-13-06-09
.. gh-issue: 127599
.. nonce: tXCZb_
.. section: Core and Builtins

Fix statistics for increments of object reference counts (in particular,
when a reference count was increased by more than 1 in a single operation).

..

.. date: 2024-12-06-01-09-40
.. gh-issue: 127651
.. nonce: 80cm6j
.. section: Core and Builtins

When raising :exc:`ImportError` for missing symbols in ``from`` imports, use
``__file__`` in the error message if ``__spec__.origin`` is not a location

..

.. date: 2024-12-05-19-25-00
.. gh-issue: 127582
.. nonce: ogUY2a
.. section: Core and Builtins

Fix non-thread-safe object resurrection when calling finalizers and watcher
callbacks in the free threading build.

..

.. date: 2024-12-04-09-52-08
.. gh-issue: 127434
.. nonce: RjkGT_
.. section: Core and Builtins

The iOS compiler shims can now accept arguments with spaces.

..

.. date: 2024-12-03-21-07-06
.. gh-issue: 127536
.. nonce: 3jMMrT
.. section: Core and Builtins

Add missing locks around some list assignment operations in the free
threading build.

..

.. date: 2024-11-30-23-35-45
.. gh-issue: 127085
.. nonce: KLKylb
.. section: Core and Builtins

Fix race when exporting a buffer from a :class:`memoryview` object on the
:term:`free-threaded <free threading>` build.

..

.. date: 2024-11-25-05-15-21
.. gh-issue: 127238
.. nonce: O8wkH-
.. section: Core and Builtins

Correct error message for :func:`sys.set_int_max_str_digits`.

..

.. date: 2024-11-24-07-01-28
.. gh-issue: 113841
.. nonce: WFg-Bu
.. section: Core and Builtins

Fix possible undefined behavior division by zero in :class:`complex`'s
:c:func:`_Py_c_pow`.

..

.. date: 2024-11-23-04-54-42
.. gh-issue: 127133
.. nonce: WMoJjF
.. section: Library

Calling :meth:`argparse.ArgumentParser.add_argument_group` on an argument
group, and calling :meth:`argparse.ArgumentParser.add_argument_group` or
:meth:`argparse.ArgumentParser.add_mutually_exclusive_group` on a mutually
exclusive group now raise exceptions. This nesting was never supported,
often failed to work correctly, and was unintentionally exposed through
inheritance. This functionality has been deprecated since Python 3.11.

..

.. date: 2024-11-21-16-13-52
.. gh-issue: 126491
.. nonce: 0YvL94
.. section: Core and Builtins

Add a marking phase to the GC. All objects that can be transitively reached
from builtin modules or the stacks are marked as reachable before cycle
detection. This reduces the amount of work done by the GC by approximately
half.

..

.. date: 2024-11-19-21-49-58
.. gh-issue: 127020
.. nonce: 5vvI17
.. section: Core and Builtins

Fix a crash in the free threading build when :c:func:`PyCode_GetCode`,
:c:func:`PyCode_GetVarnames`, :c:func:`PyCode_GetCellvars`, or
:c:func:`PyCode_GetFreevars` were called from multiple threads at the same
time.

..

.. date: 2024-11-19-17-17-32
.. gh-issue: 127010
.. nonce: 9Cl4bb
.. section: Core and Builtins

Simplify GC tracking of dictionaries. All dictionaries are tracked when
created, rather than being lazily tracked when a trackable object was added
to them. This simplifies the code considerably and results in a slight
speedup.

..

.. date: 2024-11-18-23-18-17
.. gh-issue: 126980
.. nonce: r8QHdi
.. section: Core and Builtins

Fix :meth:`~object.__buffer__` of :class:`bytearray` crashing when
:attr:`~inspect.BufferFlags.READ` or :attr:`~inspect.BufferFlags.WRITE` are
passed as flags.

..

.. date: 2024-11-17-21-35-55
.. gh-issue: 126937
.. nonce: qluVM0
.. section: Core and Builtins

Fix :exc:`TypeError` when a :class:`ctypes.Structure` has a field size that
doesn't fit into an unsigned 16-bit integer. Instead, the maximum number of
*bits* is :data:`sys.maxsize`.

..

.. date: 2024-11-16-22-37-46
.. gh-issue: 126868
.. nonce: yOoHSY
.. section: Core and Builtins

Increase performance of :class:`int` by adding a freelist for compact ints.

..

.. date: 2024-11-16-11-11-35
.. gh-issue: 126881
.. nonce: ijofLZ
.. section: Core and Builtins

Fix crash in finalization of dtoa state. Patch by Kumar Aditya.

..

.. date: 2024-11-15-16-39-37
.. gh-issue: 126892
.. nonce: QR6Yo3
.. section: Core and Builtins

Require cold or invalidated code to "warm up" before being JIT compiled
again.

..

.. date: 2024-11-07-21-48-23
.. gh-issue: 126091
.. nonce: ETaRGE
.. section: Core and Builtins

Ensure stack traces are complete when throwing into a generator chain that
ends in a custom generator.

..

.. date: 2024-10-27-04-47-28
.. gh-issue: 126024
.. nonce: XCQSqT
.. section: Core and Builtins

Optimize decoding of short UTF-8 sequences containing non-ASCII characters
by approximately 15%.

..

.. date: 2024-10-14-13-28-16
.. gh-issue: 125420
.. nonce: hNKixM
.. section: Core and Builtins

Add :meth:`memoryview.index` to :class:`memoryview` objects. Patch by
Bénédikt Tran.

..

.. date: 2024-10-14-12-34-51
.. gh-issue: 125420
.. nonce: jABXoZ
.. section: Core and Builtins

Add :meth:`memoryview.count` to :class:`memoryview` objects. Patch by
Bénédikt Tran.

..

.. date: 2024-09-25-21-50-23
.. gh-issue: 124470
.. nonce: pFr3_d
.. section: Core and Builtins

Fix crash in free-threaded builds when replacing object dictionary while
reading attribute on another thread

..

.. date: 2024-08-03-14-02-27
.. gh-issue: 69639
.. nonce: mW3iKq
.. section: Core and Builtins

Implement mixed-mode arithmetic rules combining real and complex numbers as
specified by C standards since C99.  Patch by Sergey B Kirpichev.

..

.. date: 2024-06-04-08-26-25
.. gh-issue: 120010
.. nonce: _z-AWz
.. section: Core and Builtins

Correct invalid corner cases which resulted in ``(nan+nanj)`` output in
complex multiplication, e.g., ``(1e300+1j)*(nan+infj)``.  Patch by Sergey B
Kirpichev.

..

.. date: 2023-09-22-21-01-56
.. gh-issue: 109746
.. nonce: 32MHt9
.. section: Core and Builtins

If :func:`!_thread.start_new_thread` fails to start a new thread, it deletes
its state from interpreter and thus avoids its repeated cleanup on
finalization.

..

.. date: 2024-12-16-07-12-15
.. gh-issue: 127896
.. nonce: HmI9pk
.. section: C API

The previously undocumented function :c:func:`PySequence_In` is :term:`soft
deprecated`. Use :c:func:`PySequence_Contains` instead.

..

.. date: 2024-12-10-14-25-22
.. gh-issue: 127791
.. nonce: YRw4GU
.. section: C API

Fix loss of callbacks after more than one call to
:c:func:`PyUnstable_AtExit`.

..

.. date: 2024-12-06-16-53-34
.. gh-issue: 127691
.. nonce: k_Jitp
.. section: C API

The :ref:`Unicode Exception Objects <unicodeexceptions>` C API now raises a
:exc:`TypeError` if its exception argument is not a :exc:`UnicodeError`
object. Patch by Bénédikt Tran.

..

.. date: 2024-12-02-16-10-36
.. gh-issue: 123378
.. nonce: Q6YRwe
.. section: C API

Ensure that the value of :attr:`UnicodeEncodeError.end <UnicodeError.end>`
retrieved by :c:func:`PyUnicodeEncodeError_GetEnd` lies in ``[min(1,
objlen), max(min(1, objlen), objlen)]`` where *objlen* is the length of
:attr:`UnicodeEncodeError.object <UnicodeError.object>`. Similar arguments
apply to :exc:`UnicodeDecodeError` and :exc:`UnicodeTranslateError` and
their corresponding C interface. Patch by Bénédikt Tran.

..

.. date: 2024-11-26-22-06-10
.. gh-issue: 127314
.. nonce: SsRrIu
.. section: C API

Improve error message when calling the C API without an active thread state
on the :term:`free-threaded <free threading>` build.

..

.. date: 2024-08-27-09-07-56
.. gh-issue: 123378
.. nonce: JJ6n_u
.. section: C API

Ensure that the value of :attr:`UnicodeEncodeError.start
<UnicodeError.start>` retrieved by :c:func:`PyUnicodeEncodeError_GetStart`
lies in ``[0, max(0, objlen - 1)]`` where *objlen* is the length of
:attr:`UnicodeEncodeError.object <UnicodeError.object>`. Similar arguments
apply to :exc:`UnicodeDecodeError` and :exc:`UnicodeTranslateError` and
their corresponding C interface. Patch by Bénédikt Tran.

..

.. date: 2024-08-12-10-15-19
.. gh-issue: 109523
.. nonce: S2c3fi
.. section: C API

Reading text from a non-blocking stream with ``read`` may now raise a
:exc:`BlockingIOError` if the operation cannot immediately return bytes.

..

.. date: 2024-07-03-17-26-53
.. gh-issue: 102471
.. nonce: XpmKYk
.. section: C API

Add a new import and export API for Python :class:`int` objects
(:pep:`757`):

* :c:func:`PyLong_GetNativeLayout`;
* :c:func:`PyLong_Export`;
* :c:func:`PyLong_FreeExport`;
* :c:func:`PyLongWriter_Create`;
* :c:func:`PyLongWriter_Finish`;
* :c:func:`PyLongWriter_Discard`.

Patch by Victor Stinner.

..

.. date: 2024-07-03-13-39-13
.. gh-issue: 121058
.. nonce: MKi1MV
.. section: C API

``PyThreadState_Clear()`` now warns (and calls ``sys.excepthook``) if the
thread state still has an active exception.

..

.. date: 2024-12-12-17-21-45
.. gh-issue: 127865
.. nonce: 30GDzs
.. section: Build

Fix build failure on systems without thread-locals support.

..

.. date: 2024-12-06-12-47-52
.. gh-issue: 127629
.. nonce: tD-ERQ
.. section: Build

Emscripten builds now include ctypes support.

..

.. date: 2024-11-30-16-36-09
.. gh-issue: 127111
.. nonce: QI9mMZ
.. section: Build

Updated the Emscripten web example to use ES6 modules and be built into a
distinct ``web_example`` subfolder.

..

.. date: 2024-11-22-08-46-46
.. gh-issue: 115869
.. nonce: UVLSKd
.. section: Build

Make ``jit_stencils.h`` (which is produced during JIT builds) reproducible.

..

.. date: 2024-11-20-17-12-40
.. gh-issue: 126898
.. nonce: I2zILt
.. section: Build

The Emscripten build of Python is now based on ES6 modules.