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GH-64532: Include parent's required optional arguments in subparser usage (#142355)

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Savannah Ostrowski 2025-12-06 10:30:50 -08:00 • committed by GitHub
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commit 0ed56ed88f
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3 changed files with 15 additions and 2 deletions
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6
Lib/argparse.py
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@ -2004,14 +2004,16 @@ def add_subparsers(self, **kwargs):
self._subparsers = self._positionals
# prog defaults to the usage message of this parser, skipping
# optional arguments and with no "usage:" prefix
# non-required optional arguments and with no "usage:" prefix
if kwargs.get('prog') is None:
# Create formatter without color to avoid storing ANSI codes in prog
formatter = self.formatter_class(prog=self.prog)
formatter._set_color(False)
positionals = self._get_positional_actions()
required_optionals = [action for action in self._get_optional_actions()
if action.required]
groups = self._mutually_exclusive_groups
formatter.add_usage(None, positionals, groups, '')
formatter.add_usage(None, required_optionals + positionals, groups, '')
kwargs['prog'] = formatter.format_help().strip()
# create the parsers action and add it to the positionals list