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> I also think that nargs=## could maybe be special-cased to just ignore 
> the A/O designation completely and only check there are enough, but I 
> haven't tried this out. Does this seem like a viable approach? Would a 
> patch that does that, subject to some flag, be of interest?
I can't leave well enough alone, so, with the following additional patch:
- def _match_argument(self, action, arg_strings_pattern):
+ def _match_argument(self, action, arg_strings_pattern, arg_strings, start_index):
+ import numbers
+ nargs = action.nargs if action.nargs is not None else 1
+ if isinstance(nargs, numbers.Number) and len(arg_strings_pattern) >= nargs:
+ return nargs
+
 # match the pattern for this action to the arg strings
 nargs_pattern = self._get_nargs_pattern(action)
 match = _re.match(nargs_pattern, arg_strings_pattern)
 ...
Then I get this:
 >>> import argparse
 >>> parser = argparse.ArgumentParser(prog='a2x')
 >>> parser.add_argument('--asciidoc-opts',
 ... action='store', dest='asciidoc_opts', default='',
 ... metavar='ASCIIDOC_OPTS', help='asciidoc options')
 >>> parser.parse_args(['--asciidoc-opts', '--safe'])
 Namespace(asciidoc_opts='--safe')
Comments on this approach?
(Again, I haven't run tests, it'd need to be controlled by a flag per your desire to not change existing behavior, etc.)