David Caro <[email protected]> added the comment:
It is not an issue, it will try to match all the optional parameters, and if
only one matches, then it will use it:
2110 elif option_string.startswith(option_prefix):
2111 action = self._option_string_actions[option_string]
2112 tup = action, option_string, explicit_arg
2113 result.append(tup)
and
2057 # if exactly one action matched, this segmentation is good,
2058 # so return the parsed action
2059 elif len(option_tuples) == 1:
2060 option_tuple, = option_tuples
2061 return option_tuple
if you try to add more than one optional parameter that matches the substring,
it will complain:
>>> import argparse
>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('--superstring')
_StoreAction(option_strings=['--superstring'], dest='superstring', nargs=None,
const=None, default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.parse_args(['--super','value'])
Namespace(superstring='value')
>>> parser.add_argument('--superstring2')
_StoreAction(option_strings=['--superstring'], dest='superstring', nargs=None,
const=None, default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.parse_args(['--super','value'])
usage: [-h] [--superstring SUPERSTRING] [--superstring2 SUPERSTRING2]
: error: ambiguous option: --super could match --superstring, --superstring2
----------
resolution: -> invalid
status: open -> closed
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Python tracker <[email protected]>
<http://bugs.python.org/issue10981>
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