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gh-134970: Fix exception message in argparse module (GH-134971)

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Fix the "unknown action" exception in argparse.ArgumentParser.add_argument_group()
to correctly replace the action class.
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Michał Górny 2025-06-01 07:56:56 +02:00 • committed by GitHub
parent cebae977a6
commit 965c480566
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2 changed files with 4 additions and 1 deletions
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2
Lib/argparse.py
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@ -1534,7 +1534,7 @@ class _ActionsContainer(object):
action_name = kwargs.get('action') action_name = kwargs.get('action')
action_class = self._pop_action_class(kwargs) action_class = self._pop_action_class(kwargs)
if not callable(action_class): if not callable(action_class):
raise ValueError('unknown action {action_class!r}') raise ValueError(f'unknown action {action_class!r}')
action = action_class(**kwargs) action = action_class(**kwargs)
# raise an error if action for positional argument does not # raise an error if action for positional argument does not

3
Misc/NEWS.d/next/Library/2025-05-31-12-08-12.gh-issue-134970.lgSaxq.rst Normal file
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@ -0,0 +1,3 @@
Fix the "unknown action" exception in
:meth:`argparse.ArgumentParser.add_argument_group` to correctly replace the
action class.