以-为值的Python argparse [英] Python argparse with -- as the value

问题描述

是否有一种方法可以使用argparse将--作为值传递给Python程序，而无需使用等号(=)?

Is there a way to pass -- as a value to a Python program using argparse without using the equals (=) sign?

我添加到argparser的命令行参数的定义如下:

The command line arguments that I added to the argparser are defined like below:

parser.add_argument('--myarg', help="my arg description")

您将在这样的程序中使用此参数:

You would use this argument in a program like this:

python myprogram.py --myarg value123

是否可以使用-作为值而不是'value123'来运行该程序?

Is there a way to run this program with -- as the value instead of 'value123'?

即

python myprogram.py --myarg --

推荐答案

我怀疑不可能使argparse本机执行此操作.不过，您可以将sys.argv进行预处理，作为一种非侵入式解决方法.

I suspect it will not be possible to make argparse do this natively. You could pre-process sys.argv though, as a non-intrusive workaround.

import sys
from argparse import ArgumentParser
from uuid import uuid4

sentinel = uuid4().hex

def preprocess(argv):
    return [sentinel if arg == '--' else arg for arg in argv[1:]]

def postprocess(arg):
    return '--' if arg == sentinel else arg

parser = ArgumentParser()
parser.add_argument('--myarg', help="my arg description", type=postprocess)
args = parser.parse_args(preprocess(sys.argv))

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