cli.py 文件源码

def __call__(self, parser, namespace, values, option_string=None):
        parser.print_help()

        subparsers_actions = [
            action for action in parser._actions
            if isinstance(action, argparse._SubParsersAction)]

        for subparsers_action in subparsers_actions:

            for choice, subparser in subparsers_action.choices.items():
                print("\n{}:\n{}".format(choice.upper(), "-" * (len(choice) + 1)))
                print(subparser.format_help())

        parser.exit()