Python argparse互斥组 [英] Python argparse mutual exclusive group

问题描述

我需要的是:

pro [-a xxx | [-b yyy -c zzz]]

我尝试了此操作，但不起作用.有人可以帮我吗?

I tried this but does not work. Could someone help me out?

group= parser.add_argument_group('Model 2')
group_ex = group.add_mutually_exclusive_group()
group_ex.add_argument("-a", type=str, action = "store", default = "", help="test")
group_ex_2 = group_ex.add_argument_group("option 2")
group_ex_2.add_argument("-b", type=str, action = "store", default = "", help="test")
group_ex_2.add_argument("-c", type=str, action = "store", default = "", help="test")

谢谢！

推荐答案

add_mutually_exclusive_group不会使整个组互斥.这样可以使组中的选项互斥.

add_mutually_exclusive_group doesn't make an entire group mutually exclusive. It makes options within the group mutually exclusive.

您要查找的是子命令.而不是编[-a xxxx | [-b yyy -c zzz]]，您将拥有:

What you're looking for is subcommands. Instead of prog [ -a xxxx | [-b yyy -c zzz]], you'd have:

prog 
  command 1 
    -a: ...
  command 2
    -b: ...
    -c: ...

要使用第一组参数进行调用:

To invoke with the first set of arguments:

prog command_1 -a xxxx

要使用第二组参数进行调用:

To invoke with the second set of arguments:

prog command_2 -b yyyy -c zzzz

您还可以将子命令参数设置为位置.

You can also set the sub command arguments as positional.

prog command_1 xxxx

有点像git或svn:

Kind of like git or svn:

git commit -am
git merge develop

工作示例

# 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')

测试

>>> 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

祝你好运.

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