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

问题描述

我想创建具有以下签名的参数解析器:

I want to create argument parser with following signature:

<代码>./myapp [-a [-b BVAL] |-c]

换句话说，只有在他提供参数 -a 的情况下，用户才能提供参数 -b BVAL.

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

创建-a和-c的互斥组很容易，但我不知道如何创建关系allow -b onlyif -a 提供

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 和我一样通缉.太棒了！

Docopt does it just as I wanted. Terrific!

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

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