如何避免 python 的 argparse 模块中的大写占位符? [英] How do I avoid the capital placeholders in python's argparse module?

问题描述

有一个问题询问他们来自哪里，接受的答案是一堆教程和源代码的链接.对 argparse python 模块行为的解释:在哪里大写占位符从何而来?

There was a question that asked where they come from, and the accepted answer was a bunch of links to tutorials and source code. Explanation for argparse python modul behaviour: Where do the capital placeholders come from?

这些对我都没有帮助，我想要么摆脱它们，要么了解它们的目的.

None of it was helpful to me, I want to either get rid of them, or know their purpose.

例如像这样的一行:

parser.add_argument('-c', '--chunksize', type=int, help='chunk size in bits')

产生这样的垃圾:

optional arguments:
  -h, --help            show this help message and exit
  -c CHUNKSIZE, --chunksize CHUNKSIZE
                        chunk size in bits

如果我尝试使用空元变量字符串:

and if I try with an empty metavar string:

parser.add_argument('-c', '--chunksize', metavar='', type=int, help='chunk size in bits')

逗号后有一个空格:

optional arguments:
  -h, --help            show this help message and exit
  -c , --chunksize      chunk size in bits

推荐答案

parser.add_argument('-c', '--chunksize', metavar='\b', type=int, help='chunk size in bits')

似乎有效

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