471                 if action.nargs == 0:
571             if action.nargs == 0:
602         if action.nargs is None:
604         elif action.nargs == OPTIONAL:
606         elif action.nargs == ZERO_OR_MORE:
608         elif action.nargs == ONE_OR_MORE:
610         elif action.nargs == REMAINDER:
612         elif action.nargs == PARSER:
615             formats = ['%s' for _ in range(action.nargs)]
616             result = ' '.join(formats) % get_metavar(action.nargs)
690                 if action.option_strings or action.nargs in defaulting_nargs:
795                  nargs=None,  argument
805         self.nargs = nargs
837                  nargs=None,  argument
845         if nargs == 0:
849         if const is not None and nargs != OPTIONAL:
854             nargs=nargs,
880             nargs=0,
929                  nargs=None,  argument
937         if nargs == 0:
941         if const is not None and nargs != OPTIONAL:
946             nargs=nargs,
974             nargs=0,
998             nargs=0,
1019             nargs=0,
1039             nargs=0,
1076             nargs=PARSER,
2014             default = _('expected %s argument(s)') % action.nargs
2015             msg = nargs_errors.get(action.nargs, default)
2141         nargs = action.nargs
2144         if nargs is None:
2148         elif nargs == OPTIONAL:
2152         elif nargs == ZERO_OR_MORE:
2156         elif nargs == ONE_OR_MORE:
2160         elif nargs == REMAINDER:
2164         elif nargs == PARSER:
2169             nargs_pattern = '(-*%s-*)' % '-*'.join('A' * nargs)
2184         if action.nargs not in [PARSER, REMAINDER]:
2188         if not arg_strings and action.nargs == OPTIONAL:
2199         elif (not arg_strings and action.nargs == ZERO_OR_MORE and
2208         elif len(arg_strings) == 1 and action.nargs in [None, OPTIONAL]:
2214         elif action.nargs == REMAINDER:
2218         elif action.nargs == PARSER: