path: root/Misc/NEWS.d/3.12.0b3.rst

.. date: 2023-06-15-22-11-43
.. gh-issue: 105840
.. nonce: Fum_g_
.. release date: 2023-06-19
.. section: Core and Builtins

Fix possible crashes when specializing function calls with too many
``__defaults__``.

..

.. date: 2023-06-15-15-54-47
.. gh-issue: 105831
.. nonce: -MC9Zs
.. section: Core and Builtins

Fix an f-string bug, where using a debug expression (the ``=`` sign) that
appears in the last line of a file results to the debug buffer that holds
the expression text being one character too small.

..

.. date: 2023-06-14-22-52-06
.. gh-issue: 105800
.. nonce: hdpPzZ
.. section: Core and Builtins

Correctly issue :exc:`SyntaxWarning` in f-strings if invalid sequences are
used. Patch by Pablo Galindo

..

.. date: 2023-06-10-21-38-49
.. gh-issue: 105587
.. nonce: rL3rzv
.. section: Core and Builtins

The runtime can't guarantee that immortal objects will not be mutated by
Extensions. Thus, this modifies _PyStaticObject_CheckRefcnt to warn instead
of asserting.

..

.. date: 2023-06-09-15-25-12
.. gh-issue: 105564
.. nonce: sFdUu4
.. section: Core and Builtins

Don't include artificil newlines in the ``line`` attribute of tokens in the
APIs of the :mod:`tokenize` module. Patch by Pablo Galindo

..

.. date: 2023-06-09-12-59-18
.. gh-issue: 105549
.. nonce: PYfTNp
.. section: Core and Builtins

Tokenize separately ``NUMBER`` and ``NAME`` tokens that are not ambiguous.
Patch by Pablo Galindo.

..

.. date: 2023-06-09-11-19-51
.. gh-issue: 105588
.. nonce: Y5ovpY
.. section: Core and Builtins

Fix an issue that could result in crashes when compiling malformed
:mod:`ast` nodes.

..

.. date: 2023-06-08-10-10-07
.. gh-issue: 105375
.. nonce: 35VGDd
.. section: Core and Builtins

Fix bugs in the :mod:`builtins` module where exceptions could end up being
overwritten.

..

.. date: 2023-06-08-09-54-37
.. gh-issue: 105375
.. nonce: kqKT3E
.. section: Core and Builtins

Fix bug in the compiler where an exception could end up being overwritten.

..

.. date: 2023-06-08-09-25-52
.. gh-issue: 105375
.. nonce: ocB7fT
.. section: Core and Builtins

Improve error handling in :c:func:`PyUnicode_BuildEncodingMap` where an
exception could end up being overwritten.

..

.. date: 2023-06-07-12-20-59
.. gh-issue: 105435
.. nonce: 6VllI0
.. section: Core and Builtins

Fix spurious newline character if file ends on a comment without a newline.
Patch by Pablo Galindo

..

.. date: 2023-06-06-17-10-42
.. gh-issue: 105390
.. nonce: DvqI-e
.. section: Core and Builtins

Correctly raise :exc:`tokenize.TokenError` exceptions instead of
:exc:`SyntaxError` for tokenize errors such as incomplete input. Patch by
Pablo Galindo

..

.. date: 2023-06-02-15-15-41
.. gh-issue: 104812
.. nonce: dfZiG5
.. section: Core and Builtins

The "pending call" machinery now works for all interpreters, not just the
main interpreter, and runs in all threads, not just the main thread. Some
calls are still only done in the main thread, ergo in the main interpreter.
This change does not affect signal handling nor the existing public C-API
(``Py_AddPendingCall()``), which both still only target the main thread. The
new functionality is meant strictly for internal use for now, since
consequences of its use are not well understood yet outside some very
restricted cases.  This change brings the capability in line with the
intention when the state was made per-interpreter several years ago.

..

.. date: 2023-06-19-11-31-55
.. gh-issue: 105808
.. nonce: NL-quu
.. section: Library

Fix a regression introduced in GH-101251 for 3.12, causing
:meth:`gzip.GzipFile.flush` to not flush the compressor (nor pass along the
``zip_mode`` argument).

..

.. date: 2023-06-15-18-11-47
.. gh-issue: 104799
.. nonce: BcLzbP
.. section: Library

Enable :func:`ast.unparse` to unparse function and class definitions created
without the new ``type_params`` field from :pep:`695`. Patch by Jelle
Zijlstra.

..

.. date: 2023-06-14-10-27-34
.. gh-issue: 105745
.. nonce: l1ttOQ
.. section: Library

Fix ``webbrowser.Konqueror.open`` method.

..

.. date: 2023-06-11-22-46-06
.. gh-issue: 105375
.. nonce: YkhSNt
.. section: Library

Fix a bug in :c:func:`!_Unpickler_SetInputStream` where an exception could
end up being overwritten in case of failure.

..

.. date: 2023-06-09-23-46-23
.. gh-issue: 105375
.. nonce: 9KaioS
.. section: Library

Fix bugs in :mod:`sys` where exceptions could end up being overwritten
because of deferred error handling.

..

.. date: 2023-06-09-23-00-13
.. gh-issue: 105605
.. nonce: YuwqxY
.. section: Library

Harden :mod:`pyexpat` error handling during module initialisation to prevent
exceptions from possibly being overwritten, and objects from being
dereferenced twice.

..

.. date: 2023-06-09-22-52-45
.. gh-issue: 105375
.. nonce: 6igkhn
.. section: Library

Fix bug in :mod:`decimal` where an exception could end up being overwritten.

..

.. date: 2023-06-09-22-45-26
.. gh-issue: 105375
.. nonce: 9rp6tG
.. section: Library

Fix bugs in :mod:`!_datetime` where exceptions could be overwritten in case
of module initialisation failure.

..

.. date: 2023-06-09-22-16-46
.. gh-issue: 105375
.. nonce: EgVJOP
.. section: Library

Fix bugs in :mod:`!_ssl` initialisation which could lead to leaked
references and overwritten exceptions.

..

.. date: 2023-06-09-21-46-52
.. gh-issue: 105375
.. nonce: yrJelV
.. section: Library

Fix a bug in :class:`array.array` where an exception could end up being
overwritten.

..

.. date: 2023-06-09-21-40-45
.. gh-issue: 105375
.. nonce: _sZilh
.. section: Library

Fix bugs in :mod:`_ctypes` where exceptions could end up being overwritten.

..

.. date: 2023-06-09-21-30-59
.. gh-issue: 105375
.. nonce: eewafp
.. section: Library

Fix a bug in the :mod:`posix` module where an exception could be
overwritten.

..

.. date: 2023-06-09-21-25-14
.. gh-issue: 105375
.. nonce: 95g1eI
.. section: Library

Fix bugs in :mod:`!_elementtree` where exceptions could be overwritten.

..

.. date: 2023-06-09-21-11-28
.. gh-issue: 105375
.. nonce: 4Mxn7t
.. section: Library

Fix bugs in :mod:`zoneinfo` where exceptions could be overwritten.

..

.. date: 2023-06-09-21-04-39
.. gh-issue: 105375
.. nonce: bTcqS9
.. section: Library

Fix bugs in :mod:`pickle` where exceptions could be overwritten.

..

.. date: 2023-06-08-08-58-36
.. gh-issue: 105375
.. nonce: bTcqS9
.. section: Library

Fix bugs in :mod:`pickle` where exceptions could be overwritten.

..

.. date: 2023-06-07-00-09-52
.. gh-issue: 105375
.. nonce: Y_9D4n
.. section: Library

Fix a bug in :mod:`sqlite3` where an exception could be overwritten in the
:meth:`collation <sqlite3.Connection.create_collation>` callback.

..

.. date: 2023-06-06-11-50-33
.. gh-issue: 105332
.. nonce: tmpgRA
.. section: Library

Revert pickling method from by-name back to by-value.

..

.. date: 2023-06-02-14-23-41
.. gh-issue: 104310
.. nonce: UamCOB
.. section: Library

In the beta 1 release we added a utility function for extension module
authors, to use when testing their module for support in multiple
interpreters or under a per-interpreter GIL.  The name of that function has
changed from ``allowing_all_extensions`` to
``_incompatible_extension_module_restrictions``.  The default for the
"disable_check" argument has change from ``True`` to ``False``, to better
match the new function name.

..

.. date: 2023-05-26-21-24-06
.. gh-issue: 104996
.. nonce: aaW78g
.. section: Library

Improve performance of :class:`pathlib.PurePath` initialisation by deferring
joining of paths when multiple arguments are given.

..

.. date: 2023-03-12-01-17-15
.. gh-issue: 102541
.. nonce: LK1adc
.. section: Library

Hide traceback in :func:`help` prompt, when import failed.

..

.. date: 2023-05-29-14-49-46
.. gh-issue: 105084
.. nonce: lvVvoj
.. section: Tests

When the Python build is configured ``--with-wheel-pkg-dir``, tests
requiring the ``setuptools`` and ``wheel`` wheels will search for the wheels
in ``WHEEL_PKG_DIR``.

..

.. date: 2023-06-08-11-30-17
.. gh-issue: 105436
.. nonce: 1qlDxw
.. section: Windows

Ensure that an empty environment block is terminated by two null characters,
as is required by Windows.

..

.. date: 2023-06-09-23-34-25
.. gh-issue: 105375
.. nonce: n7amiF
.. section: C API

Fix a bug in :c:func:`PyErr_WarnExplicit` where an exception could end up
being overwritten if the API failed internally.

..

.. date: 2023-06-09-19-16-57
.. gh-issue: 105603
.. nonce: -z6G22
.. section: C API

We've renamed the new (in 3.12) ``PyInterpreterConfig.own_gil`` to
``PyInterpreterConfig.gil`` and changed the meaning of the value from "bool"
to an integer with supported values of ``PyInterpreterConfig_DEFAULT_GIL``,
``PyInterpreterConfig_SHARED_GIL``, and ``PyInterpreterConfig_OWN_GIL``. The
default is "shared".

..

.. date: 2023-06-09-12-35-55
.. gh-issue: 105387
.. nonce: wM_oL-
.. section: C API

In the limited C API version 3.12, :c:func:`Py_INCREF` and
:c:func:`Py_DECREF` functions are now implemented as opaque function calls
to hide implementation details. Patch by Victor Stinner.

..

.. date: 2023-06-06-14-14-41
.. gh-issue: 103968
.. nonce: BTO6II
.. section: C API

:c:func:`PyType_FromMetaclass` now allows metaclasses with ``tp_new`` set to
``NULL``.