allow_abbrev=False does not work for single-dash long options #104860
Description
Bug report
The following codes get different results between python3.6.9 and python3.8.10
import argparse
if __name__ == "__main__":
parser = argparse.ArgumentParser(
allow_abbrev=False
)
parser.add_argument('-on', "--output-name", type=str, help="output")
args, _ = parser.parse_known_args(["-on", "name", "-o", "dir"])
print(args)python3.6.9
[chenf@b12e0231:/mnt/ssd/chenf/projects/test_hhb_2.4/debug/cmd_config]$ python3 --version
Python 3.6.9
[chenf@b12e0231:/mnt/ssd/chenf/projects/test_hhb_2.4/debug/cmd_config]$ python3 ~/test.py
Namespace(output_name='name')python3.8.10
[chenf@b11b0623:/mnt/ssd/chenf/project/hhb_test_2.4/cmd_config]$ python3 --version
Python 3.8.10
[chenf@b11b0623:/mnt/ssd/chenf/project/hhb_test_2.4/cmd_config]$ python3 ~/test.py
Namespace(output_name='dir')Debug
I have tried to debug the codes and get some clues.
I have set the allow_abbrev=False to disable prefix match, but it works in python3.6.9 and fails in python3.8.10.
When I div into argparse.py and find that it considers the allow_abbrev in python3.6.9 but not in python3.8.10 as follow:
in python3.6.9 argparse.py
def _parse_optional(self, arg_string):
....
if self.allow_abbrev:
# search through all possible prefixes of the option string
# and all actions in the parser for possible interpretations
option_tuples = self._get_option_tuples(arg_string)
# if multiple actions match, the option string was ambiguous
if len(option_tuples) > 1:
options = ', '.join([option_string
for action, option_string, explicit_arg in option_tuples])
args = {'option': arg_string, 'matches': options}
msg = _('ambiguous option: %(option)s could match %(matches)s')
self.error(msg % args)
# if exactly one action matched, this segmentation is good,
# so return the parsed action
elif len(option_tuples) == 1:
option_tuple, = option_tuples
return option_tuple
....in python3.8.10 argparse.py
def _parse_optional(self, arg_string):
....
# search through all possible prefixes of the option string
# and all actions in the parser for possible interpretations
option_tuples = self._get_option_tuples(arg_string)
# if multiple actions match, the option string was ambiguous
if len(option_tuples) > 1:
options = ', '.join([option_string
for action, option_string, explicit_arg in option_tuples])
args = {'option': arg_string, 'matches': options}
msg = _('ambiguous option: %(option)s could match %(matches)s')
self.error(msg % args)
# if exactly one action matched, this segmentation is good,
# so return the parsed action
elif len(option_tuples) == 1:
option_tuple, = option_tuples
return option_tuple
....Linked PRs
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