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GeezerVison is showing github.com — gh-135490: Add warning about arguments that conflict with pdb by SnoopJ · Pull Request #135520 · python/cpython

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@SnoopJ

@SnoopJ SnoopJ commented Jun 14, 2025 •
edited by github-actions Bot
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Closes #135490.

This changeset adds a warning to the pdb docs explaining that target program arguments that overlap with pdb arguments must be separated from the rest of the command line by -- to prevent confusion on the part of argparse.

Should only be merged if a fix for that issue does not materialize, although the pdb target.py -- -m XYZ case is likely to apply even if there is a fix for the the repeated -m case.

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Screenshot of proposed Python documentation

  • Issue: pdb consumes arguments greedily #135490

📚 Documentation preview 📚: https://cpython-previews--135520.org.readthedocs.build/

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@SnoopJ
Add warning about arguments that conflict with pdb
4f3f060
@SnoopJ
SnoopJ requested a review from gaogaotiantian as a code owner June 14, 2025 17:50
@bedevere-app bedevere-app Bot added awaiting review docs Documentation in the Doc dir skip news labels Jun 14, 2025
@github-project-automation github-project-automation Bot added this to Docs PRs Jun 14, 2025
@github-project-automation github-project-automation Bot moved this to Todo in Docs PRs Jun 14, 2025
@bedevere-app bedevere-app Bot mentioned this pull request Jun 14, 2025
pdb consumes arguments greedily #135490
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ZeroIntensity
ZeroIntensity reviewed Jun 14, 2025
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Comment thread Doc/library/pdb.rst
restarting preserves pdb's state (such as breakpoints) and in most cases is more
useful than quitting the debugger upon program's exit.

.. warning::

@ZeroIntensity ZeroIntensity Jun 14, 2025

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I think this should be a note, not a warning. Warnings are typically reserved for security problems and things along those lines.

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@ZeroIntensity ZeroIntensity added needs backport to 3.13 only security fixes needs backport to 3.14 bugs and security fixes labels Jun 14, 2025
@gaogaotiantian

gaogaotiantian commented Jun 14, 2025

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I agree that this should be be a warning. However, let's hold it off until I figure out what we should do about the actual behavior, because -m might just work and we don't need to use it as an example to confuse users. -p does not start a script so it won't take any extra arguments and everything might just magically work.
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@github-actions

github-actions Bot commented Apr 26, 2026

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This PR is stale because it has been open for 30 days with no activity.
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@github-actions github-actions Bot added the stale Stale PR or inactive for long period of time. label Apr 26, 2026
@serhiy-storchaka serhiy-storchaka added the needs backport to 3.15 bugs and security fixes label May 30, 2026
@github-actions github-actions Bot removed the stale Stale PR or inactive for long period of time. label Jun 1, 2026
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github-actions Bot commented Sep 3, 2026

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This PR is stale because it has been open for 90 days with no activity.
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@github-actions github-actions Bot added the stale Stale PR or inactive for long period of time. label Sep 3, 2026
@SnoopJ

SnoopJ commented Oct 20, 2026

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The originating issue is no longer present in Python 3.14 or 3.15, so only users of pdb as in Python 3.13 are affected. Closing.
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@SnoopJ SnoopJ closed this Oct 20, 2026
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@ZeroIntensity ZeroIntensity ZeroIntensity left review comments
@gaogaotiantian gaogaotiantian Awaiting requested review from gaogaotiantian gaogaotiantian is a code owner

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awaiting review docs Documentation in the Doc dir needs backport to 3.13 only security fixes needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes skip news stale Stale PR or inactive for long period of time.

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pdb consumes arguments greedily

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@SnoopJ @gaogaotiantian @ZeroIntensity @serhiy-storchaka
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