How to check if an argument from commandline has been set?

Question

I can call my script like this:

python D:\\myscript.py 60

And in the script I can do:

arg = sys.argv[1]
foo(arg)
         


        

Answer 1

Don't use sys.argv for handling the command-line interface; there's a module to do that: argparse.

You can mark an argument as required by passing required=True to add_argument.

import argparse
parser = argparse.ArgumentParser(description='Process some integers.')
parser.add_argument("foo", ..., required=True)
parser.parse_args()