__main__.py 文件源码

def _format_action_invocation(self, action):
        if action.nargs == argparse.PARSER:
            return ''
        if not action.option_strings or action.nargs == 0:
            return super()._format_action_invocation(action)
        return '%s %s' % (
            ', '.join(action.option_strings),
            self._format_args(
                action, self._get_default_metavar_for_optional(action)))