Steven Bethard <steven.beth...@gmail.com> added the comment:

The problem is basically that _parse_known_args calls _parse_optional to 
determine whether something is an optional or a positional. But _parse_optional 
only checks "if arg_string in self._option_string_actions", that is, if the 
string can be found in the main parser actions.

So either this method needs to check the subparser actions, or the "if 
arg_string in self._option_string_actions" stuff needs to be delayed until the 
subparser. Neither of these seems like a simple change, but I agree it's a bug.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14365>
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