在argparse中未设置optinal的情况下如何获取两个位置参数 [英] How to take two positional arguments when optinal isn't set in argparse

问题描述

当我不设置可选参数时，我想编写一个需要两个位置参数的argparse命令.就我而言，这就像我想用两个必要的参数来调用它，但是当我说python3 test.py -gui时，我希望您不需要这两个参数，因为那样您就在使用gui.

I want to write a argparse command that needs two postional arguments when I don't set a optional argument. In my case it's like I want to call it with two necessary parameters but when I say python3 test.py -gui I want that you don't need this two arguments, because then you are using the gui.

Thx

推荐答案

这是我在评论中提出的建议:

This is what I was proposing in the comments:

import argparse

parser = argparse.ArgumentParser()
parser.add_argument('--gui', action='store_true', help="use GUI")
parser.add_argument('args', nargs='*')
cmdargs = parser.parse_args()
nargs = len(cmdargs.args)
nargs_expected = 0 if cmdargs.gui else 2
if nargs != nargs_expected:
    parser.error(f"{nargs_expected} arguments were expected, but got {nargs}")

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