不要在 argparse 的 print_help() 中显示两次长选项

本文介绍了不要在 argparse 的 print_help() 中显示两次长选项的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有以下代码:

parser = argparse.ArgumentParser(description='Postfix Queue Administration Tool',
        prog='pqa',
        usage='%(prog)s [-h] [-v,--version]')
parser.add_argument('-l', '--list', action='store_true',
        help='Shows full overview of all queues')
parser.add_argument('-q', '--queue', action='store', metavar='<queue>', dest='queue',
        help='Show information for <queue>')
parser.add_argument('-d', '--domain', action='store', metavar='<domain>', dest='domain',
        help='Show information about a specific <domain>')
parser.add_argument('-v', '--version', action='version', version='%(prog)s 0.1')
args = parser.parse_args()

这给了我这样的输出:

%./pqa
usage: pqa [-h] [-v,--version]

Postfix Queue Administration Tool

optional arguments:
  -h, --help            show this help message and exit
  -l, --list            Shows full overview of all queues
  -q <queue>, --queue <queue>
                        Show information for <queue>
  -d <domain>, --domain <domain>
                        Show information about a specific <domain>
  -v, --version         show program's version number and exit

我非常想知道如何将具有两个版本(即长选项)的命令分组"，每个版本都显示一个元变量.

I would very much like to know how I can 'group' commands that have two versions (ie. long options) which each also show a metavar.

这主要是我这边的审美问题，但我仍然想解决这个问题.我一直在互联网上阅读手册和文本，但要么信息不存在，要么我在这里完全遗漏了一些东西:)

This is mostly an aesthetic issue on my side, but I would still like to fix this. I have been reading manuals and texts on the internet, but either the information just isn't there or I am totally missing something here :)

另一种解决方案，使用自定义描述

如果您设置了 metavar=''，则帮助行变为:

-q , --queue          Show information for <queue>

这里我取消了常规帮助行，并将它们替换为组的描述行:

Here I suppress the regular help lines, and replace them with the description lines for a group:

parser = argparse.ArgumentParser(description='Postfix Queue Administration Tool',
        prog='pqa',
        usage='%(prog)s [-h] [-v,--version]',
        formatter_class=argparse.RawDescriptionHelpFormatter,
        )
parser.add_argument('-l', '--list', action='store_true',
        help='Shows full overview of all queues')
g = parser.add_argument_group(title='information options',
        description='''-q, --queue <queue>     Show information for <queue>
-d, --domain <domain>   Show information about a specific <domain>''')
g.add_argument('-q', '--queue', action='store', metavar='', dest='queue',
        help=argparse.SUPPRESS)
g.add_argument('-d', '--domain', action='store', metavar='<domain>', dest='domain',
        help=argparse.SUPPRESS)
parser.add_argument('-v', '--version', action='version', version='%(prog)s 0.1')
parser.print_help()

usage: pqa [-h] [-v,--version]

Postfix Queue Administration Tool

optional arguments:
  -h, --help     show this help message and exit
  -l, --list     Shows full overview of all queues
  -v, --version  show program's version number and exit

information options:
  -q, --queue <queue>     Show information for <queue>
  -d, --domain <domain>   Show information about a specific <domain>

或者您可以将该信息放在常规描述中.您已经在使用自定义用法行了.

Or you could put that information in the regular description. You already are using a custom usage line.

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长选项