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

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@YvesDup

@YvesDup YvesDup commented Jul 26, 2025 •
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This note explains the implications between the location of the function or callable object passed to the target argument and the selected start method when you create a new Process object in a REPL session.

I wonder if I have to add a reference to the issue at end of the note..

This should be backport to: 3.14

  • Issue: REPL: AttributeError: module __mp_main__ has no attribute is_prime in ProcessPoolExecutor example #132898

📚 Documentation preview 📚: https://cpython-previews--137118.org.readthedocs.build/

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@YvesDup
initial commit
c64de22
@YvesDup
YvesDup requested a review from gpshead as a code owner July 26, 2025 14:52
@bedevere-app bedevere-app Bot added awaiting review docs Documentation in the Doc dir skip news labels Jul 26, 2025
@github-project-automation github-project-automation Bot added this to Docs PRs Jul 26, 2025
@github-project-automation github-project-automation Bot moved this to Todo in Docs PRs Jul 26, 2025
@bedevere-app bedevere-app Bot mentioned this pull request Jul 26, 2025
REPL: AttributeError: module __mp_main__ has no attribute is_prime in ProcessPoolExecutor example #132898
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@YvesDup
Merge branch 'main' into Update-doc-process-target-location
dd2d43e
@gpshead gpshead added the needs backport to 3.14 bugs and security fixes label Jul 27, 2025
@gpshead
Reword, expand, and clarify the limitation, highlighting the REPL case.
607ae4a
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gpshead commented Jul 27, 2025

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Thanks! I took this and started looking around the docs to tie things together. reworded now, with cross references.
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@gpshead gpshead self-assigned this Jul 27, 2025
@gpshead gpshead added the needs backport to 3.13 only security fixes label Jul 27, 2025
@gpshead
Move out of a .. note into the main text. mention in the high level P…
b9773c7 
…rocess description.
@gpshead
gpshead force-pushed the Update-doc-process-target-location branch from 83344ec to b9773c7 Compare July 27, 2025 18:59
gpshead added 3 commits July 27, 2025 19:07
@gpshead
move back to a note, it keeps it clear that this is "special"
4ad605a
@gpshead
editing for clarity
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formatting
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gpshead
gpshead approved these changes Jul 27, 2025
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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting review labels Jul 27, 2025
@gpshead gpshead changed the title gh-132898: Add a note in multiprocessing.Process class documentation about how creating a process in a REPL session gh-132898: Add a note in multiprocessing.Process docs about creating a process in a REPL session Jul 27, 2025
@gpshead
add a pointer to the GH issue from the doc note
4b848a9
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gpshead merged commit 4e40f2b into python:main Jul 27, 2025
@bedevere-app bedevere-app Bot removed the awaiting merge label Jul 27, 2025
@miss-islington-app

miss-islington-app Bot commented Jul 27, 2025

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Thanks @YvesDup for the PR, and @gpshead for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14.
🐍🍒⛏🤖
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@github-project-automation github-project-automation Bot moved this from Todo to Done in Docs PRs Jul 27, 2025
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Jul 27, 2025
@YvesDup @gpshead @miss-islington
pythongh-132898: Add a note in multiprocessing.Process docs about c…
db28dc7 
…reating a process in a REPL (pythonGH-137118)

* Reword, expand, and clarify the limitation, highlighting the REPL case.
* Mention in the high level Process description.
* added a pointer to the GH issue from the doc note

---------
(cherry picked from commit 4e40f2b)

Co-authored-by: Duprat <[email protected]>
Co-authored-by: Gregory P. Smith <[email protected]>
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Jul 27, 2025
@YvesDup @gpshead @miss-islington
pythongh-132898: Add a note in multiprocessing.Process docs about c…
d78fb93 
…reating a process in a REPL (pythonGH-137118)

* Reword, expand, and clarify the limitation, highlighting the REPL case.
* Mention in the high level Process description.
* added a pointer to the GH issue from the doc note

---------
(cherry picked from commit 4e40f2b)

Co-authored-by: Duprat <[email protected]>
Co-authored-by: Gregory P. Smith <[email protected]>
@bedevere-app

bedevere-app Bot commented Jul 27, 2025

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GH-137154 is a backport of this pull request to the 3.14 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Jul 27, 2025
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bedevere-app Bot commented Jul 27, 2025

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GH-137155 is a backport of this pull request to the 3.13 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.13 only security fixes label Jul 27, 2025
gpshead added a commit that referenced this pull request Jul 27, 2025
@miss-islington @YvesDup @gpshead
[3.13] gh-132898: Add a note in multiprocessing.Process docs about …
f867711 
…creating a process in a REPL (GH-137118) (#137155)

gh-132898: Add a note in `multiprocessing.Process` docs about creating a process in a REPL (GH-137118)

* Reword, expand, and clarify the limitation, highlighting the REPL case.
* Mention in the high level Process description.
* added a pointer to the GH issue from the doc note

---------
(cherry picked from commit 4e40f2b)

Co-authored-by: Duprat <[email protected]>
Co-authored-by: Gregory P. Smith <[email protected]>
@YvesDup
YvesDup deleted the Update-doc-process-target-location branch July 27, 2025 20:34
hugovk pushed a commit that referenced this pull request Jul 28, 2025
@miss-islington @YvesDup @gpshead
[3.14] gh-132898: Add a note in multiprocessing.Process docs about …
9da008d 
…creating a process in a REPL (GH-137118) (#137154)

Co-authored-by: Duprat <[email protected]>
Co-authored-by: Gregory P. Smith <[email protected]>
@YvesDup
YvesDup restored the Update-doc-process-target-location branch July 29, 2025 20:13
Agent-Hellboy pushed a commit to Agent-Hellboy/cpython that referenced this pull request Aug 19, 2025
@YvesDup @gpshead @Agent-Hellboy
pythongh-132898: Add a note in multiprocessing.Process docs about c…
5cdaa9f 
…reating a process in a REPL (pythonGH-137118)

* Reword, expand, and clarify the limitation, highlighting the REPL case.
* Mention in the high level Process description.
* added a pointer to the GH issue from the doc note

---------

Co-authored-by: Gregory P. Smith <[email protected]>
kumaraditya303 pushed a commit to miss-islington/cpython that referenced this pull request Sep 9, 2025
@miss-islington @YvesDup
@gpshead @kumaraditya303
[3.14] pythongh-132898: Add a note in multiprocessing.Process docs …
0917766 
…about creating a process in a REPL (pythonGH-137118) (python#137154)

Co-authored-by: Duprat <[email protected]>
Co-authored-by: Gregory P. Smith <[email protected]>
@YvesDup
YvesDup deleted the Update-doc-process-target-location branch September 18, 2025 09:52
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