Python ArgumentParser嵌套参数 [英] Python ArgumentParser nested arguments

问题描述

我想创建带有以下签名的参数解析器:

I want to create argument parser with following signature:

./myapp [-a [-b BVAL] | -c]

换句话说，用户只有在提供参数-a的情况下才可以提供参数-b BVAL.

In other words, user could provide argument -b BVAL only in case if he provided argument -a.

创建-a和-c的互斥组非常容易，但是我不知道如何创建关系allow -b only if -a provided

It's quite easy to create mutually exclusive group of -a and -c, but I can't figure out how to create relationship allow -b only if -a provided

推荐答案

Docopt 就像我一样通缉.太棒了！

Docopt does it just as I wanted. Terrific!

docopt('./myapp [-a [-b BVAL] | -c]')

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