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gh-138525: Support single-dash long options and prefix_chars in BooleanOptionalAction (GH-138692)

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-nofoo is generated for -foo.
++no-foo is generated for ++foo.
/nofoo is generated for /foo.
This commit is contained in:
Serhiy Storchaka 2025-11-22 22:54:02 +02:00 • committed by GitHub
parent cde19e565c
commit 425fd85ca3
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GPG key ID: B5690EEEBB952194
5 changed files with 102 additions and 4 deletions
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20
Lib/argparse.py
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@ -932,15 +932,26 @@ def __init__(self,
deprecated=False):
_option_strings = []
neg_option_strings = []
for option_string in option_strings:
_option_strings.append(option_string)
if option_string.startswith('--'):
if option_string.startswith('--no-'):
if len(option_string) > 2 and option_string[0] == option_string[1]:
# two-dash long option: '--foo' -> '--no-foo'
if option_string.startswith('no-', 2):
raise ValueError(f'invalid option name {option_string!r} '
f'for BooleanOptionalAction')
option_string = '--no-' + option_string[2:]
option_string = option_string[:2] + 'no-' + option_string[2:]
_option_strings.append(option_string)
neg_option_strings.append(option_string)
elif len(option_string) > 2 and option_string[0] != option_string[1]:
# single-dash long option: '-foo' -> '-nofoo'
if option_string.startswith('no', 1):
raise ValueError(f'invalid option name {option_string!r} '
f'for BooleanOptionalAction')
option_string = option_string[:1] + 'no' + option_string[1:]
_option_strings.append(option_string)
neg_option_strings.append(option_string)
super().__init__(
option_strings=_option_strings,
@ -950,11 +961,12 @@ def __init__(self,
required=required,
help=help,
deprecated=deprecated)
self.neg_option_strings = neg_option_strings
def __call__(self, parser, namespace, values, option_string=None):
if option_string in self.option_strings:
setattr(namespace, self.dest, not option_string.startswith('--no-'))
setattr(namespace, self.dest, option_string not in self.neg_option_strings)
def format_usage(self):
return ' | '.join(self.option_strings)