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bpo-39716: Raise on conflicting subparser names. (GH-18605)

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Raise an ArgumentError when the same subparser name is added twice to an
ArgumentParser.  This is consistent with the (default) behavior when the
same option string is added twice to an ArgumentParser.

(Support for `conflict_handler="resolve"` could be considered as a
followup feature, although real use cases seem even rarer than
"resolve"ing option-strings.)

Automerge-Triggered-By: GH:rhettinger
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Antony Lee 2022-05-01 08:04:50 +02:00 • committed by GitHub
parent 9588f880a2
commit ad5e8520f3
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7
Lib/argparse.py
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@ -1171,6 +1171,13 @@ class _SubParsersAction(Action):
aliases = kwargs.pop('aliases', ())
if name in self._name_parser_map:
raise ArgumentError(self, _('conflicting subparser: %s') % name)
for alias in aliases:
if alias in self._name_parser_map:
raise ArgumentError(
self, _('conflicting subparser alias: %s') % alias)
# create a pseudo-action to hold the choice help
if 'help' in kwargs:
help = kwargs.pop('help')