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ocessing-start-methods`. - While this restriction is not true if using the ``"fork"`` start method, - as of Python ``3.14`` that is no longer the default on any platform. See - :ref:`multiprocessing-start-methods`. + .. versionchanged:: 3.3 + Added the *daemon* parameter. .. method:: run() From 4ad605aa1e3bee48da97ed134c354acd8dcf2467 Mon Sep 17 00:00:00 2001 From: "Gregory P. Smith" Date: Sun, 27 Jul 2025 19:07:37 +0000 Subject: [PATCH 4/7] move back to a note, it keeps it clear that this is "special" --- Doc/library/multiprocessing.rst | 46 +++++++++++++++++---------------- 1 file changed, 24 insertions(+), 22 deletions(-) diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst index ca3e0bca76c2d0..9df60627ef763f 100644 --- a/Doc/library/multiprocessing.rst +++ b/Doc/library/multiprocessing.rst @@ -548,33 +548,35 @@ The :mod:`multiprocessing` package mostly replicates the API of the base class constructor (:meth:`Process.__init__`) before doing anything else to the process. - In general, all arguments to :meth:`Process.__init__` must be picklable. - This is particularly notable when trying to create a :class:`Process` or - use a :class:`~concurrent.futures.ProcessPoolExecutor` from a REPL with a - locally defined *target* function. + .. note:: - Passing a callable object defined in the current REPL session raises an - :exc:`AttributeError` exception when starting the process as such as - *target* must have been defined within an importable module to under to be - unpickled. + In general, all arguments to :meth:`Process.__init__` must be picklable. + This is particularly notable when trying to create a :class:`Process` or use + a :class:`concurrent.futures.ProcessPoolExecutor` from a REPL with a locally + defined *target* function. - Example:: + Passing a callable object defined in the current REPL session raises an + :exc:`AttributeError` exception when starting the process as such as + *target* must have been defined within an importable module to under to be + unpickled. - >>> import multiprocessing as mp - >>> def knigit(): - ... print("knee!") - ... - >>> mp.Process(target=knigit).start() - >>> Traceback (most recent call last): - File ".../multiprocessing/spawn.py", line ..., in spawn_main - File ".../multiprocessing/spawn.py", line ..., in _main - AttributeError: module '__main__' has no attribute 'knigit' + Example:: + + >>> import multiprocessing as mp + >>> def knigit(): + ... print("knee!") + ... + >>> mp.Process(target=knigit).start() + >>> Traceback (most recent call last): + File ".../multiprocessing/spawn.py", line ..., in spawn_main + File ".../multiprocessing/spawn.py", line ..., in _main + AttributeError: module '__main__' has no attribute 'knigit' - See :ref:`multiprocessing-programming-spawn`. + See :ref:`multiprocessing-programming-spawn`. - While this restriction is not true if using the ``"fork"`` start method, - as of Python ``3.14`` that is no longer the default on any platform. See - :ref:`multiprocessing-start-methods`. + While this restriction is not true if using the ``"fork"`` start method, + as of Python ``3.14`` that is no longer the default on any platform. See + :ref:`multiprocessing-start-methods`. .. versionchanged:: 3.3 Added the *daemon* parameter. From 2a115a31475647b01b04d401bc2cb9d48883d9be Mon Sep 17 00:00:00 2001 From: "Gregory P. Smith" Date: Sun, 27 Jul 2025 19:23:34 +0000 Subject: [PATCH 5/7] editing for clarity --- Doc/library/multiprocessing.rst | 36 +++++++++++++++++---------------- 1 file changed, 19 insertions(+), 17 deletions(-) diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst index 9df60627ef763f..3f940782382c83 100644 --- a/Doc/library/multiprocessing.rst +++ b/Doc/library/multiprocessing.rst @@ -545,37 +545,39 @@ The :mod:`multiprocessing` package mostly replicates the API of the to pass to *target*. If a subclass overrides the constructor, it must make sure it invokes the - base class constructor (:meth:`Process.__init__`) before doing anything else + base class constructor (``super().__init__()``) before doing anything else to the process. .. note:: - In general, all arguments to :meth:`Process.__init__` must be picklable. - This is particularly notable when trying to create a :class:`Process` or use - a :class:`concurrent.futures.ProcessPoolExecutor` from a REPL with a locally - defined *target* function. + In general, all arguments to :class:`Process` must be picklable. This is + frequently observed when trying to create a :class:`Process` or use a + :class:`concurrent.futures.ProcessPoolExecutor` from a REPL with a + locally defined *target* function. - Passing a callable object defined in the current REPL session raises an - :exc:`AttributeError` exception when starting the process as such as - *target* must have been defined within an importable module to under to be - unpickled. + Passing a callable object defined in the current REPL session causes the + child process to die via an uncaught :exc:`AttributeError` exception when + starting as *target* must have been defined within an importable module + in order to be loaded during unpickling. - Example:: + Example of this uncatchable error from the child:: >>> import multiprocessing as mp >>> def knigit(): - ... print("knee!") + ... print("Ni!") ... - >>> mp.Process(target=knigit).start() + >>> process = mp.Process(target=knigit) + >>> process.start() >>> Traceback (most recent call last): File ".../multiprocessing/spawn.py", line ..., in spawn_main File ".../multiprocessing/spawn.py", line ..., in _main AttributeError: module '__main__' has no attribute 'knigit' + >>> process + - See :ref:`multiprocessing-programming-spawn`. - - While this restriction is not true if using the ``"fork"`` start method, - as of Python ``3.14`` that is no longer the default on any platform. See + See :ref:`multiprocessing-programming-spawn`. While this restriction is + not true if using the ``"fork"`` start method, as of Python ``3.14`` that + is no longer the default on any platform. See :ref:`multiprocessing-start-methods`. .. versionchanged:: 3.3 @@ -3107,7 +3109,7 @@ start method. More picklability - Ensure that all arguments to :meth:`Process.__init__` are picklable. + Ensure that all arguments to :class:`Process` are picklable. Also, if you subclass :class:`~multiprocessing.Process` then make sure that instances will be picklable when the :meth:`Process.start ` method is called. From 5f36fbff8c5c0f524ec2d799bc40c191cf1b7bd6 Mon Sep 17 00:00:00 2001 From: "Gregory P. Smith" Date: Sun, 27 Jul 2025 19:30:54 +0000 Subject: [PATCH 6/7] formatting --- Doc/library/multiprocessing.rst | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst index 3f940782382c83..dd6591043fbb23 100644 --- a/Doc/library/multiprocessing.rst +++ b/Doc/library/multiprocessing.rst @@ -3109,10 +3109,10 @@ start method. More picklability - Ensure that all arguments to :class:`Process` are picklable. - Also, if you subclass :class:`~multiprocessing.Process` then make sure that - instances will be picklable when the :meth:`Process.start - ` method is called. + Ensure that all arguments to :class:`~multiprocessing.Process` are + picklable. Also, if you subclass ``Process.__init__``, you must make sure + that instances will be picklable when the + :meth:`Process.start ` method is called. Global variables From 4b848a9ff95806c55fcb3ea52c4119795f802bbd Mon Sep 17 00:00:00 2001 From: "Gregory P. Smith" Date: Sun, 27 Jul 2025 19:39:53 +0000 Subject: [PATCH 7/7] add a pointer to the GH issue from the doc note --- Doc/library/multiprocessing.rst | 1 + 1 file changed, 1 insertion(+) diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst index dd6591043fbb23..d18ada3511d891 100644 --- a/Doc/library/multiprocessing.rst +++ b/Doc/library/multiprocessing.rst @@ -579,6 +579,7 @@ The :mod:`multiprocessing` package mostly replicates the API of the not true if using the ``"fork"`` start method, as of Python ``3.14`` that is no longer the default on any platform. See :ref:`multiprocessing-start-methods`. + See also :gh:`132898`. .. versionchanged:: 3.3 Added the *daemon* parameter. pFad - Phonifier reborn

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