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GH-123299: Copyedit 3.14 What's New: Other Language Changes #139425

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Merged
AA-Turner merged 7 commits into from
Oct 2, 2025
Merged

GH-123299: Copyedit 3.14 What's New: Other Language Changes #139425

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910e1e0
Copyedit 3.14 What's New: Other Language Changes
AA-Turner Sep 29, 2025
241ed67
Mention the forkserver start method change in Porting
AA-Turner Sep 30, 2025
f73396d
PyREPL -> default interactive shell
AA-Turner Sep 30, 2025
1c0bfc0
Merge branch 'main' into docs/whatsnew/other-language-changes
AA-Turner Oct 2, 2025
0e9a8a1
Prepend section name with PEP identifier
AA-Turner Oct 2, 2025
e5e128a
Hugo's capitalisation suggestion
AA-Turner Oct 2, 2025
a243820
func -> meth
AA-Turner Oct 2, 2025
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Mention the forkserver start method change in Porting
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@AA-Turner
AA-Turner committed Sep 30, 2025
commit 241ed67e46deb306e86cd663f86dbc1e17d06f02
18 changes: 18 additions & 0 deletions Doc/whatsnew/3.14.rst
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Expand Up @@ -1312,6 +1312,8 @@ concurrent.futures
in :pep:`734`.
(Contributed by Eric Snow in :gh:`124548`.)

.. _whatsnew314-concurrent-futures-start-method:

* On Unix platforms other than macOS, :ref:`'forkserver'
<multiprocessing-start-method-forkserver>` is now the the default :ref:`start
method <multiprocessing-start-methods>` for
Expand Down Expand Up @@ -1745,6 +1747,8 @@ mimetypes
multiprocessing
---------------

.. _whatsnew314-multiprocessing-start-method:

* On Unix platforms other than macOS, :ref:`'forkserver'
<multiprocessing-start-method-forkserver>` is now the the default :ref:`start
method <multiprocessing-start-methods>`
Expand Down Expand Up @@ -3210,6 +3214,20 @@ that may require changes to your code.
Changes in the Python API
-------------------------

* On Unix platforms other than macOS, *forkserver* is now the default
:ref:`start method <multiprocessing-start-methods>` for :mod:`multiprocessing`
and :class:`~concurrent.futures.ProcessPoolExecutor`, instead of *fork*.

See :ref:`(1) <whatsnew314-concurrent-futures-start-method>` and
:ref:`(2) <whatsnew314-multiprocessing-start-method>` for details.

If you encounter :exc:`NameError`\s or pickling errors coming out of
:mod:`multiprocessing` or :mod:`concurrent.futures`, see the
:ref:`forkserver restrictions <multiprocessing-programming-forkserver>`.

This change does not affect Windows or macOS, where :ref:`'spawn'
<multiprocessing-start-method-spawn>` remains the default start method.

* :class:`functools.partial` is now a method descriptor.
Wrap it in :func:`staticmethod` if you want to preserve the old behavior.
(Contributed by Serhiy Storchaka and Dominykas Grigonis in :gh:`121027`.)
Expand Down
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