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GH-75949: Fix argparse dropping '|' in mutually exclusive groups on line wrap (#142312)

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Savannah Ostrowski 2025-12-06 07:12:21 -08:00 • committed by GitHub
parent 61823a5382
commit 5be3405e4e
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3 changed files with 49 additions and 4 deletions
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19
Lib/test/test_argparse.py
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@ -4966,6 +4966,25 @@ def test_long_mutex_groups_wrap(self):
''')
self.assertEqual(parser.format_usage(), usage)
def test_mutex_groups_with_mixed_optionals_positionals_wrap(self):
# https://github.com/python/cpython/issues/75949
# Mutually exclusive groups containing both optionals and positionals
# should preserve pipe separators when the usage line wraps.
parser = argparse.ArgumentParser(prog='PROG')
g = parser.add_mutually_exclusive_group()
g.add_argument('-v', '--verbose', action='store_true')
g.add_argument('-q', '--quiet', action='store_true')
g.add_argument('-x', '--extra-long-option-name', nargs='?')
g.add_argument('-y', '--yet-another-long-option', nargs='?')
g.add_argument('positional', nargs='?')
usage = textwrap.dedent('''\
usage: PROG [-h] [-v | -q | -x [EXTRA_LONG_OPTION_NAME] |
-y [YET_ANOTHER_LONG_OPTION] |
positional]
''')
self.assertEqual(parser.format_usage(), usage)
class TestHelpVariableExpansion(HelpTestCase):
"""Test that variables are expanded properly in help messages"""