sys.argv CLI参数的python-helper列表

Question

I have to read a CLI argument for my python script and then pass that input argument by the user to a method. I want to provide user with a list of valid arguments that she can enter, sort of when you run the script with an invalid argument or with no argument passed- it shows you that you can only enter these arguments.

I know we can achieve this with argparse module, but argparse in my case will be an overkill- since I just want to pass whatever (valid)argument the user gave to a method. How should I achieve this?

parser.add_argument('--system-status', '-st', metavar='<host>', type=str)
if args.system-status:
    method(args.system-status)

And the same stuff repeated for 5 other variables?

Answer 1

The argparse lib is the way to go, if you dont want to check for each parameter you could use something like this:

import argparse

parser = argparse.ArgumentParser()
parser.add_argument('--foo')
parser.add_argument('--bar')
parser.add_argument('--baz')
args = parser.parse_args()

def f(foo=None, bar=None, baz=None, **kwargs):
    print(foo)
    print(bar)
    print(baz)

f(**args.__dict__)

**args.__dict__ will turn args in a dictionary turn it into kwargs.

If you really absolutly don't want to use argparse then sys.argv will give you the list of parameters passed to the function.