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gh-132898: Add a note in `multiprocessing.Process` docs about creating a process in a REPL session by YvesDup · Pull Request #137118 · python/cpython · GitHub
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gh-132898: Add a note in multiprocessing.Process docs about creating a process in a REPL session #137118

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Merged
gpshead merged 8 commits into from
Jul 27, 2025
Merged

gh-132898: Add a note in multiprocessing.Process docs about creating a process in a REPL session #137118

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c64de22
initial commit
YvesDup Jul 23, 2025
dd2d43e
Merge branch 'main' into Update-doc-process-target-location
YvesDup Jul 26, 2025
607ae4a
Reword, expand, and clarify the limitation, highlighting the REPL case.
gpshead Jul 27, 2025
b9773c7
Move out of a .. note into the main text. mention in the high level …
gpshead Jul 27, 2025
4ad605a
move back to a note, it keeps it clear that this is "special"
gpshead Jul 27, 2025
2a115a3
editing for clarity
gpshead Jul 27, 2025
5f36fbf
formatting
gpshead Jul 27, 2025
4b848a9
add a pointer to the GH issue from the doc note
gpshead Jul 27, 2025
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@YvesDup
YvesDup committed Jul 26, 2025
commit c64de22e76aa621a4e168b21f43b8b8aa10b2940
15 changes: 15 additions & 0 deletions Doc/library/multiprocessing.rst
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Expand Up @@ -544,6 +544,21 @@ The :mod:`multiprocessing` package mostly replicates the API of the
.. versionchanged:: 3.3
Added the *daemon* parameter.

.. note::

Starting with Python 3.14, ``'fork'`` is no longer the default start
method on any operating system. When creating a new ``Process`` object
in a REPL session, with a start method such as ``'spawn'`` or ``'forkserver'``
(other than ``'fork'``), the *target* argument must be
a callable object **mandatorily** defined in a module.

Using a callable object defined in the current REPL session raises
an :exc:`AttributeError` exception when starting the process,
although this is still possible when the start method is ``'fork'``.

This also applies to the use of the
:class:`concurrent.futures.ProcessPoolExecutor` class.

.. method:: run()

Method representing the process's activity.
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