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@ppwwyyxx
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Users of my library report this as an issue to my project when they encounter this error. The error message can be made more actionable - pointing them to a more detailed documentation that explains the fix.

@ppwwyyxx
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Can I get a reviewer? Thanks

@arhadthedev
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@pitrou, @gpshead (as active multiprocessing experts)

@ppwwyyxx
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Hi, multiprocessing experts @pitrou and @gpshead, can you take a moment to look at this change in error message?

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pitrou commented Aug 14, 2023

@serhiy-storchaka What do you think?

@serhiy-storchaka
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Sorry, I am not an expert in this field and there are no code changes that I can quickly understand and review.

I can only point out that including web links in an error message is unusual, but this multi-line error message is already unusual. The code was added by @roudkerk in bpo-8713.

@gpshead gpshead added docs Documentation in the Doc dir needs backport to 3.11 only security fixes needs backport to 3.12 only security fixes labels Aug 16, 2023
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gpshead commented Aug 16, 2023

This is effectively a documentation change. It's an error message that should not be seen often, but is intended to tell people how to fix their code so they don't hit the error. Expanding on it and linking back to the multiprocessing docs seems fine to me, even if unusual.

@gpshead gpshead merged commit a794ebe into python:main Aug 16, 2023
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Thanks @ppwwyyxx for the PR, and @gpshead for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11, 3.12.
🐍🍒⛏🤖

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GH-107990 is a backport of this pull request to the 3.12 branch.

@bedevere-bot bedevere-bot removed the needs backport to 3.12 only security fixes label Aug 16, 2023
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GH-107991 is a backport of this pull request to the 3.11 branch.

@bedevere-bot bedevere-bot removed the needs backport to 3.11 only security fixes label Aug 16, 2023
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Aug 16, 2023
…GH-102203)

(cherry picked from commit a794ebe)

Co-authored-by: Yuxin Wu <[email protected]>
Co-authored-by: Yuxin Wu <[email protected]>
Co-authored-by: Oleg Iarygin <[email protected]>
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Aug 16, 2023
…GH-102203)

(cherry picked from commit a794ebe)

Co-authored-by: Yuxin Wu <[email protected]>
Co-authored-by: Yuxin Wu <[email protected]>
Co-authored-by: Oleg Iarygin <[email protected]>
gpshead pushed a commit that referenced this pull request Aug 16, 2023
…H-102203) (#107991)

More actionable error message when spawn is incorrectly used. (GH-102203)
(cherry picked from commit a794ebe)

Co-authored-by: Yuxin Wu <[email protected]>
Co-authored-by: Yuxin Wu <[email protected]>
Co-authored-by: Oleg Iarygin <[email protected]>
Yhg1s pushed a commit that referenced this pull request Aug 16, 2023
…H-102203) (#107990)

More actionable error message when spawn is incorrectly used. (GH-102203)
(cherry picked from commit a794ebe)

Co-authored-by: Yuxin Wu <[email protected]>
Co-authored-by: Yuxin Wu <[email protected]>
Co-authored-by: Oleg Iarygin <[email protected]>
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7 participants