gh-123299: Copyedit "What's New in Python 3.14" (#125438)

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Pending Removal in Python 3.14
Pending removal in Python 3.14
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
* The ``ma_version_tag`` field in :c:type:`PyDictObject` for extension modules

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Pending Removal in Python 3.15
Pending removal in Python 3.15
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
* The bundled copy of ``libmpdecimal``.

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Pending Removal in Future Versions
Pending removal in future versions
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The following APIs are deprecated and will be removed,

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@ -7,7 +7,7 @@ Deprecations
.. include:: pending-removal-in-future.rst
C API Deprecations
C API deprecations
------------------
.. include:: c-api-pending-removal-in-3.15.rst

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Pending Removal in Python 3.13
Pending removal in Python 3.13
------------------------------
Modules (see :pep:`594`):

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Pending Removal in Python 3.14
Pending removal in Python 3.14
------------------------------
* The import system:

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Pending Removal in Python 3.15
Pending removal in Python 3.15
------------------------------
* The import system:
@ -63,7 +63,7 @@ Pending Removal in Python 3.15
* The undocumented keyword argument syntax for creating
:class:`~typing.NamedTuple` classes
(e.g. ``Point = NamedTuple("Point", x=int, y=int)``)
(for example, ``Point = NamedTuple("Point", x=int, y=int)``)
has been deprecated since Python 3.13.
Use the class-based syntax or the functional syntax instead.

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@ -1,15 +1,6 @@
Pending Removal in Python 3.16
Pending removal in Python 3.16
------------------------------
* :mod:`builtins`:
* Bitwise inversion on boolean types, ``~True`` or ``~False``
has been deprecated since Python 3.12,
as it produces surprising and unintuitive results (``-2`` and ``-1``).
Use ``not x`` instead for the logical negation of a Boolean.
In the rare case that you need the bitwise inversion of
the underlying integer, convert to ``int`` explicitly (``~int(x)``).
* :mod:`array`:
* The ``'u'`` format code (:c:type:`wchar_t`)
@ -20,12 +11,20 @@ Pending Removal in Python 3.16
* :mod:`asyncio`:
* :mod:`asyncio`:
:func:`!asyncio.iscoroutinefunction` is deprecated
* :func:`!asyncio.iscoroutinefunction` is deprecated
and will be removed in Python 3.16,
use :func:`inspect.iscoroutinefunction` instead.
(Contributed by Jiahao Li and Kumar Aditya in :gh:`122875`.)
* :mod:`builtins`:
* Bitwise inversion on boolean types, ``~True`` or ``~False``
has been deprecated since Python 3.12,
as it produces surprising and unintuitive results (``-2`` and ``-1``).
Use ``not x`` instead for the logical negation of a Boolean.
In the rare case that you need the bitwise inversion of
the underlying integer, convert to ``int`` explicitly (``~int(x)``).
* :mod:`shutil`:
* The :class:`!ExecError` exception

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Pending Removal in Future Versions
Pending removal in future versions
----------------------------------
The following APIs will be removed in the future,

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@ -1,6 +1,6 @@
****************************
What's New In Python 3.14
What's new in Python 3.14
****************************
:Editor: TBD
@ -56,7 +56,7 @@ For full details, see the :ref:`changelog <changelog>`.
so it's worth checking back even after reading earlier versions.
Summary -- Release highlights
Summary -- release highlights
=============================
.. This section singles out the most important changes in Python 3.14.
@ -67,12 +67,12 @@ Summary -- Release highlights
New Features
New features
============
.. _whatsnew-314-pep649:
.. _whatsnew314-pep649:
PEP 649: Deferred Evaluation of Annotations
PEP 649: deferred evaluation of annotations
-------------------------------------------
The :term:`annotations <annotation>` on functions, classes, and modules are no
@ -150,12 +150,12 @@ In Python 3.7, :pep:`563` introduced the ``from __future__ import annotations``
directive, which turns all annotations into strings. This directive is now
considered deprecated and it is expected to be removed in a future version of Python.
However, this removal will not happen until after Python 3.13, the last version of
Python without deferred evaluation of annotations, reaches its end of life.
Python without deferred evaluation of annotations, reaches its end of life in 2029.
In Python 3.14, the behavior of code using ``from __future__ import annotations``
is unchanged.
Improved Error Messages
Improved error messages
-----------------------
* When unpacking assignment fails due to incorrect number of variables, the
@ -172,16 +172,16 @@ Improved Error Messages
ValueError: too many values to unpack (expected 3, got 4)
Other Language Changes
Other language changes
======================
* Incorrect usage of :keyword:`await` and asynchronous comprehensions
is now detected even if the code is optimized away by the :option:`-O`
command line option. For example, ``python -O -c 'assert await 1'``
command-line option. For example, ``python -O -c 'assert await 1'``
now produces a :exc:`SyntaxError`. (Contributed by Jelle Zijlstra in :gh:`121637`.)
* Writes to ``__debug__`` are now detected even if the code is optimized
away by the :option:`-O` command line option. For example,
away by the :option:`-O` command-line option. For example,
``python -O -c 'assert (__debug__ := 1)'`` now produces a
:exc:`SyntaxError`. (Contributed by Irit Katriel in :gh:`122245`.)
@ -191,7 +191,7 @@ Other Language Changes
(Contributed by Serhiy Storchaka in :gh:`84978`.)
New Modules
New modules
===========
* :mod:`annotationlib`: For introspecting :term:`annotations <annotation>`.
@ -199,7 +199,7 @@ New Modules
(Contributed by Jelle Zijlstra in :gh:`119180`.)
Improved Modules
Improved modules
================
argparse
@ -214,7 +214,7 @@ ast
---
* Add :func:`ast.compare` for comparing two ASTs.
(Contributed by Batuhan Taskaya and Jeremy Hylton in :issue:`15987`.)
(Contributed by Batuhan Taskaya and Jeremy Hylton in :gh:`60191`.)
* Add support for :func:`copy.replace` for AST nodes.
(Contributed by Bénédikt Tran in :gh:`121141`.)
@ -246,6 +246,12 @@ decimal
:meth:`Decimal.from_number() <decimal.Decimal.from_number>`.
(Contributed by Serhiy Storchaka in :gh:`121798`.)
datetime
--------
* Add :meth:`datetime.time.strptime` and :meth:`datetime.date.strptime`.
(Contributed by Wannes Boeykens in :gh:`41431`.)
dis
---
@ -254,9 +260,10 @@ dis
This feature is added to the following interfaces via the *show_positions*
keyword argument:
- :class:`dis.Bytecode`,
- :func:`dis.dis`, :func:`dis.distb`, and
- :func:`dis.disassemble`.
- :class:`dis.Bytecode`
- :func:`dis.dis`
- :func:`dis.distb`
- :func:`dis.disassemble`
This feature is also exposed via :option:`dis --show-positions`.
(Contributed by Bénédikt Tran in :gh:`123165`.)
@ -310,7 +317,8 @@ json
of the error.
(Contributed by Serhiy Storchaka in :gh:`122163`.)
* Enable the :mod:`json` module to work as a script using the :option:`-m` switch: ``python -m json``.
* Enable the :mod:`json` module to work as a script using the :option:`-m`
switch: :program:`python -m json`.
See the :ref:`JSON command-line interface <json-commandline>` documentation.
(Contributed by Trey Hunner in :gh:`122873`.)
@ -325,12 +333,6 @@ operator
(Contributed by Raymond Hettinger and Nico Mexis in :gh:`115808`.)
datetime
--------
* Add :meth:`datetime.time.strptime` and :meth:`datetime.date.strptime`.
(Contributed by Wannes Boeykens in :gh:`41431`.)
os
--
@ -357,11 +359,11 @@ pathlib
pdb
---
* Hard-coded breakpoints (:func:`breakpoint` and :func:`pdb.set_trace`) now
* Hardcoded breakpoints (:func:`breakpoint` and :func:`pdb.set_trace`) now
reuse the most recent :class:`~pdb.Pdb` instance that calls
:meth:`~pdb.Pdb.set_trace`, instead of creating a new one each time.
As a result, all the instance specific data like :pdbcmd:`display` and
:pdbcmd:`commands` are preserved across hard-coded breakpoints.
:pdbcmd:`commands` are preserved across hardcoded breakpoints.
(Contributed by Tian Gao in :gh:`121450`.)
* Add a new argument *mode* to :class:`pdb.Pdb`. Disable the ``restart``
@ -391,9 +393,9 @@ symtable
* Expose the following :class:`symtable.Symbol` methods:
* :meth:`~symtable.Symbol.is_free_class`
* :meth:`~symtable.Symbol.is_comp_iter`
* :meth:`~symtable.Symbol.is_comp_cell`
* :meth:`~symtable.Symbol.is_comp_iter`
* :meth:`~symtable.Symbol.is_free_class`
(Contributed by Bénédikt Tran in :gh:`120029`.)
@ -472,11 +474,11 @@ ast
* Remove the following classes. They were all deprecated since Python 3.8,
and have emitted deprecation warnings since Python 3.12:
* :class:`!ast.Bytes`
* :class:`!ast.Ellipsis`
* :class:`!ast.NameConstant`
* :class:`!ast.Num`
* :class:`!ast.Str`
* :class:`!ast.Bytes`
* :class:`!ast.NameConstant`
* :class:`!ast.Ellipsis`
Use :class:`ast.Constant` instead. As a consequence of these removals,
user-defined ``visit_Num``, ``visit_Str``, ``visit_Bytes``,
@ -501,16 +503,16 @@ asyncio
* Remove the following classes and functions. They were all deprecated and
emitted deprecation warnings since Python 3.12:
* :class:`!asyncio.AbstractChildWatcher`
* :class:`!asyncio.SafeChildWatcher`
* :class:`!asyncio.MultiLoopChildWatcher`
* :class:`!asyncio.FastChildWatcher`
* :class:`!asyncio.ThreadedChildWatcher`
* :class:`!asyncio.PidfdChildWatcher`
* :meth:`!asyncio.AbstractEventLoopPolicy.get_child_watcher`
* :meth:`!asyncio.AbstractEventLoopPolicy.set_child_watcher`
* :func:`!asyncio.get_child_watcher`
* :func:`!asyncio.set_child_watcher`
* :meth:`!asyncio.AbstractEventLoopPolicy.get_child_watcher`
* :meth:`!asyncio.AbstractEventLoopPolicy.set_child_watcher`
* :class:`!asyncio.AbstractChildWatcher`
* :class:`!asyncio.FastChildWatcher`
* :class:`!asyncio.MultiLoopChildWatcher`
* :class:`!asyncio.PidfdChildWatcher`
* :class:`!asyncio.SafeChildWatcher`
* :class:`!asyncio.ThreadedChildWatcher`
(Contributed by Kumar Aditya in :gh:`120804`.)
@ -623,14 +625,14 @@ Changes in the Python API
(Contributed by Serhiy Storchaka in :gh:`69998`.)
Build Changes
Build changes
=============
C API Changes
C API changes
=============
New Features
New features
------------
* Add :c:func:`PyLong_GetSign` function to get the sign of :class:`int` objects.
@ -640,17 +642,17 @@ New Features
object:
* :c:func:`PyUnicodeWriter_Create`
* :c:func:`PyUnicodeWriter_DecodeUTF8Stateful`
* :c:func:`PyUnicodeWriter_Discard`
* :c:func:`PyUnicodeWriter_Finish`
* :c:func:`PyUnicodeWriter_WriteChar`
* :c:func:`PyUnicodeWriter_WriteUTF8`
* :c:func:`PyUnicodeWriter_WriteUCS4`
* :c:func:`PyUnicodeWriter_WriteWideChar`
* :c:func:`PyUnicodeWriter_WriteStr`
* :c:func:`PyUnicodeWriter_WriteRepr`
* :c:func:`PyUnicodeWriter_WriteSubstring`
* :c:func:`PyUnicodeWriter_Format`
* :c:func:`PyUnicodeWriter_DecodeUTF8Stateful`
* :c:func:`PyUnicodeWriter_WriteChar`
* :c:func:`PyUnicodeWriter_WriteRepr`
* :c:func:`PyUnicodeWriter_WriteStr`
* :c:func:`PyUnicodeWriter_WriteSubstring`
* :c:func:`PyUnicodeWriter_WriteUCS4`
* :c:func:`PyUnicodeWriter_WriteUTF8`
* :c:func:`PyUnicodeWriter_WriteWideChar`
(Contributed by Victor Stinner in :gh:`119182`.)
@ -671,14 +673,14 @@ New Features
* Add new functions to convert C ``<stdint.h>`` numbers from/to Python
:class:`int`:
* :c:func:`PyLong_FromInt32`
* :c:func:`PyLong_FromInt64`
* :c:func:`PyLong_FromUInt32`
* :c:func:`PyLong_FromUInt64`
* :c:func:`PyLong_AsInt32`
* :c:func:`PyLong_AsInt64`
* :c:func:`PyLong_AsUInt32`
* :c:func:`PyLong_AsUInt64`
* :c:func:`PyLong_FromInt32`
* :c:func:`PyLong_FromInt64`
* :c:func:`PyLong_FromUInt32`
* :c:func:`PyLong_FromUInt64`
(Contributed by Victor Stinner in :gh:`120389`.)
@ -701,20 +703,20 @@ New Features
* Add functions to configure the Python initialization (:pep:`741`):
* :c:func:`Py_InitializeFromInitConfig`
* :c:func:`PyInitConfig_AddModule`
* :c:func:`PyInitConfig_Create`
* :c:func:`PyInitConfig_Free`
* :c:func:`PyInitConfig_FreeStrList`
* :c:func:`PyInitConfig_GetError`
* :c:func:`PyInitConfig_GetExitCode`
* :c:func:`PyInitConfig_HasOption`
* :c:func:`PyInitConfig_GetInt`
* :c:func:`PyInitConfig_GetStr`
* :c:func:`PyInitConfig_GetStrList`
* :c:func:`PyInitConfig_FreeStrList`
* :c:func:`PyInitConfig_HasOption`
* :c:func:`PyInitConfig_SetInt`
* :c:func:`PyInitConfig_SetStr`
* :c:func:`PyInitConfig_SetStrList`
* :c:func:`PyInitConfig_AddModule`
* :c:func:`Py_InitializeFromInitConfig`
(Contributed by Victor Stinner in :gh:`107954`.)