__main__.py 文件源码

def _format_action(self, action):
        if type(action) == argparse._SubParsersAction:
            # calculate the subcommand max length
            subactions = action._get_subactions()
            invocations = [self._format_action_invocation(a)
                           for a in subactions]
            self._subcommand_max_length = max(len(i) for i in invocations)
        if type(action) == argparse._SubParsersAction._ChoicesPseudoAction:
            # format subcommand help line
            subcommand = self._format_action_invocation(action)
            help_text = self._expand_help(action)
            return ("  {:{width}}\t\t{} \n").format(
                    subcommand, help_text, width=self._subcommand_max_length)
        elif type(action) == argparse._SubParsersAction:
            # eliminate subcommand choices line {cmd1, cmd2}
            msg = ''
            for subaction in action._get_subactions():
                msg += self._format_action(subaction)
            return msg
        else:
            return super(SimpleHelpFormatter, self)._format_action(action)