Method __call__

Lib/argparse.py:1362–1397

(self, parser, namespace, values, option_string=None)

        return self._choices_actions

    def __call__(self, parser, namespace, values, option_string=None):
        parser_name = values[0]
        arg_strings = values[1:]

        # set the parser name if requested
        if self.dest is not SUPPRESS:
            setattr(namespace, self.dest, parser_name)

        # select the parser
        try:
            subparser = self._name_parser_map[parser_name]
        except KeyError:
            args = {'parser_name': parser_name,
                    'choices': ', '.join(self._name_parser_map)}
            msg = _('unknown parser %(parser_name)r (choices: %(choices)s)') % args
            raise ArgumentError(self, msg)

        if parser_name in self._deprecated:
            parser._warning(_("command '%(parser_name)s' is deprecated") %
                            {'parser_name': parser_name})

        # parse all the remaining options into the namespace
        # store any unrecognized options on the object, so that the top
        # level parser can decide what to do with them

        # In case this subparser defines new defaults, we parse them
        # in a new namespace object and then update the original
        # namespace for the relevant parts.
        subnamespace, arg_strings = subparser.parse_known_args(arg_strings, None)
        for key, value in vars(subnamespace).items():
            setattr(namespace, key, value)

        if arg_strings:
            if not hasattr(namespace, _UNRECOGNIZED_ARGS_ATTR):
                setattr(namespace, _UNRECOGNIZED_ARGS_ATTR, [])
            getattr(namespace, _UNRECOGNIZED_ARGS_ATTR).extend(arg_strings)

class _ExtendAction(_AppendAction):
    def __call__(self, parser, namespace, values, option_string=None):