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Closed as not planned
Description
Bug report
Bug description:
parser.parse_known_args() behavior is inconsistent when '--' is present in argument list.
It ends up in extras if last known argument is an optional.
import argparse
p = argparse.ArgumentParser()
p.add_argument('a')
p.add_argument('b')
p.add_argument('--qwe', required=False)
print(p.parse_known_args(['a', 'b', '--qwe', 'qwe', '--', 'c', '--d', '--qwe', 'asd']))
# OUTPUT: (Namespace(a='a', b='b', qwe='qwe'), ['--', 'c', '--d', '--qwe', 'asd'])
# Expected: (Namespace(a='a', b='b', qwe='qwe'), ['c', '--d', '--qwe', 'asd'])However, if last known argument is positional, then '--' is not present in extras, as expected.
import argparse
p = argparse.ArgumentParser()
p.add_argument('a')
p.add_argument('b')
p.add_argument('--qwe', required=False)
print(p.parse_known_args(['--qwe', 'qwe', 'a', 'b', '--', 'c', '--d', '--qwe', 'asd']))
# OUTPUT: (Namespace(a='a', b='b', qwe='qwe'), ['c', '--d', '--qwe', 'asd'])Seems like it happens because '--' is consumed along with positional argument in consume_positionals(), because self._match_arguments_partial() uses 'A-' pattern for that case.
CPython versions tested on:
3.10, 3.11, 3.12
Operating systems tested on:
Windows, Linux
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