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 -am
git merge develop
# create the top-level parser
parser = 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" command
parser_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" command
parser_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')
>>> parser.print_help()
usage: PROG [-h] [--foo] {command_1,command_2} ...
positional arguments:
{command_1,command_2}
help for subcommand
command_1 command_1 help
command_2 help for command_2
optional 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。
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