让 argparse 收集但不响应标志 [英] Have argparse collect, but not respond to, flags

问题描述

我有一个脚本，它接受一些参数，使用其中一些参数来选择要运行的脚本，并将其余参数传递给该脚本.所以它看起来像这样:

I have a script which takes in some arguments, uses some of those argument to choose a script to run, and passes the rest of the arguments to that script. So it looks something like this:

parser = ArgumentParser()
parser.add_argument('script', choices['a', 'b'])
parser.add_argument('rest_args', nargs='*')
args = parser.parse_args()
if args.script == 'a':
    subprocess.call('python a.py %s' % ' '.join(args.rest_args))
else:
    subprocess.call('python b.py %s' % ' '.join(args.rest_args))

这很好用，除非我想传入以 - 开头的参数.例如，如果我调用 python my_script.py a --foo，我会得到一个错误 unrecognized arguments，当我真的想让它运行 python a.py --foo(即只需将 --foo 传递给子进程).

This works fine, unless I want to pass in arguments that start with -. For example, if I called python my_script.py a --foo, I'd get an error unrecognized arguments, when really I want to just have it run python a.py --foo (i.e. just pass the --foo along to the subprocess).

有没有办法用 argparse 解决这个问题?

Is there a way to get around this with argparse?

推荐答案

也许您正在寻找 parse_known_args.它将解析它识别的所有选项，并返回 unknown 中所有无法识别的参数:

Perhaps you are looking for parse_known_args. It will parse all the options it recognizes, and returns all the unrecognized arguments in unknown:

import argparse
parser = argparse.ArgumentParser()
parser.add_argument('script', choices=['a', 'b'])

args, unknown = parser.parse_known_args(['a', '--foo'])

print(args)
# Namespace(script='a')
print(unknown)
# ['--foo']

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