python cmd2多参数解析器

我有4个论点，例如：a，b，c，d。用户可以选择输入a或b或c或d，否则a或c，否则仅输入“a”或“d”，就像这样，遵循所有概率。为此，我们将介绍如何编写参数解析器

subscription_parser = argparse.ArgumentParser()
subscribe_parent =  argparse.ArgumentParser(add_help=False)
stream_parsers = subscription_parser.add_subparsers(title='subcommands', help='subcommand help')
stream_parser_sub = stream_parsers.add_parser('stream', parents=[subscribe_parent], help='callhome_port help')
stream_parser_sub.add_argument('stream', type=str, help='stream name')
# create_parser_filter = argparse.ArgumentParser()
filter_parser = stream_parser_sub.add_subparsers(title='subcommands', help='subcommand help')
filter_sub_parser = filter_parser.add_parser('filter',parents=[subscribe_parent], help='callhome_port help')
filter_sub_parser.add_argument('filter', type=str, help='filter value')
# create_parser_start = argparse.ArgumentParser()
start_parser = filter_sub_parser.add_subparsers(title='subcommands', help='subcommand help')
start_sub_parser = start_parser.add_parser('starttime', parents=[subscribe_parent], help='callhome_port help')
start_sub_parser.add_argument('start', type=str, help='starttime')
# create_parser_stop = argparse.ArgumentParser()
stop_parser = start_sub_parser.add_subparsers(title='subcommands', help='subcommand help')
stop_sub_parser = stop_parser.add_parser('stoptime', parents=[subscribe_parent], help='callhome_port help')
stop_sub_parser.add_argument('stop', type=str, help='stoptime')

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感谢您提前

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docopt

@Alex谢谢，我从cmd2获得的大多数案例。所以，如果我要改变这个包，对我来说会很复杂。在cmd2中是否有实现的可能性？