8000 Argparse misparses options in certain situations · Issue #94843 · python/cpython · GitHub
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DemiMarie opened this issue Jul 14, 2022 · 2 comments
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Argparse misparses options in certain situations #94843

DemiMarie opened this issue Jul 14, 2022 · 2 comments
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stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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@DemiMarie
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DemiMarie commented Jul 14, 2022 •
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Bug report

The argparse module misparses options in certain complex situations. I am not sure what the exact prerequisites are, but Qubes OS does manage to trigger the issue. QubesOS/qubes-core-admin-client#214 has the details. Sorry for the lack of a minimal reproducer.

Edit: One case where the bug happens is when an option X (which takes an optional argument) is followed by an optional positional parameter, and the two are mutually exclusive. Argparse thinks that --dispvm A B C is --dispvm=A -- B C and considers B to be the optional positional parameter. Since it is mutually incompatible with --dispvm, an exception is thrown.

Your environment

  • CPython versions tested on: 3.8 through 3.10 inclusive
  • Operating system and architecture: Linux x86_64
@DemiMarie DemiMarie added the type-bug An unexpected behavior, bug, or error label Jul 14, 2022
@AlexWaygood AlexWaygood added the stdlib Python modules in the Lib dir label Jul 14, 2022
@terryjreedy terryjreedy moved this to Bugs in Argparse issues Aug 16, 2023
@serhiy-storchaka
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If I understand this correctly, the original issue was fixed in #81691 and #53780.

The case mentioned in the second paragraph seems unrelated to the bug and is a new feature request. Please open a new issue if you still want it to be implemented. Please be more concrete in the title and provide more details of expected behavior, preferably with a sample code.

@serhiy-storchaka serhiy-storchaka added the pending The issue will be closed if no feedback is provided label Oct 22, 2024
@picnixz
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picnixz commented Dec 2, 2024

Closing as completed since the original issue was fixed. A new issue could be opened as Serhiy suggested for a new feature request.

@picnixz picnixz closed this as completed Dec 2, 2024
@github-project-automation github-project-automation bot moved this from Bugs to Doc issues in Argparse issues Dec 2, 2024
@picnixz picnixz removed the pending The issue will be closed if no feedback is provided label Dec 2, 2024
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stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error
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Status: Doc issues
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@serhiy-storchaka @DemiMarie @picnixz @AlexWaygood
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