How to parse multiple nested sub-commands using python argparse?

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I came up with the same qustion, and it seems i have got a better answer.

The solution is we shall not simply nest subparser with another subparser, but we can add subparser following with a parser following another subparser.

Code tell you how:

parent_parser = argparse.ArgumentParser(add_help=False)
parent_parser.add_argument('--user', '-u',
                    default=getpass.getuser(),
                    help='username')
parent_parser.add_argument('--debug', default=False, required=False,
                        action='store_true', dest="debug", help='debug flag')
main_parser = argparse.ArgumentParser()
service_subparsers = main_parser.add_subparsers(title="service",
                    dest="service_command")
service_parser = service_subparsers.add_parser("first", help="first",
                    parents=[parent_parser])
action_subparser = service_parser.add_subparsers(title="action",
                    dest="action_command")
action_parser = action_subparser.add_parser("second", help="second",
                    parents=[parent_parser])

args = main_parser.parse_args()

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