add_mutually_exclusive_group不会使整个组互斥。它使组内的选项互斥。
您正在寻找的是子命令。而不是编[-a xxxx | [-b yyy -c zzz]]，您将拥有：
prog command 1 -a: ... command 2 -b: ... -c: ...
要使用第一组参数进行调用：
prog command_1 -a xxxx
要使用第二组参数进行调用：
prog command_2 -b yyyy -c zzzz
您还可以将子命令参数设置为位置。
prog command_1 xxxx
有点像git或svn：
git commit -amgit merge develop
工作范例
# create the top-level parserparser = argparse.ArgumentParser(prog='PROG')parser.add_argument('--foo', action='store_true', help='help for foo arg.')subparsers = parser.add_subparsers(help='help for subcommand')# create the parser for the "command_1" commandparser_a = subparsers.add_parser('command_1', help='command_1 help')parser_a.add_argument('a', type=str, help='help for bar, positional')# create the parser for the "command_2" commandparser_b = subparsers.add_parser('command_2', help='help for command_2')parser_b.add_argument('-b', type=str, help='help for b')parser_b.add_argument('-c', type=str, action='store', default='', help='test')测试一下
>>> parser.print_help()usage: PROG [-h] [--foo] {command_1,command_2} ...positional arguments: {command_1,command_2} help for subcommand command_1command_1 help command_2help for command_2optional arguments: -h, --help show this help message and exit --foo help for foo arg.>>>>>> parser.parse_args(['command_1', 'working'])Namespace(a='working', foo=False)>>> parser.parse_args(['command_1', 'wellness', '-b x'])usage: PROG [-h] [--foo] {command_1,command_2} ...PROG: error: unrecognized arguments: -b x祝好运。
