How do I run Python script using arguments in windows command line

This is my python hello.py script:

def hello(a,b):
    print "hello and that's your sum:"
    sum=a+b
    print sum
    import sys

if __name__ == "__main__":
    hello(sys.argv[2])

The problem is that it can't be run from the windows command line prompt, I used this command:

C:\Python27>hello 1 1

But it didn't work unfortunately, may somebody please help?

• import sys out of hello function.
• arguments should be converted to int.
• String literal that contain ' should be escaped or should be surrouned by ".
• Did you invoke the program with python hello.py <some-number> <some-number> in command line?

import sys

def hello(a,b):
    print "hello and that's your sum:", a + b

if __name__ == "__main__":
    a = int(sys.argv[1])
    b = int(sys.argv[2])
    hello(a, b)

I found this thread looking for information about dealing with parameters; this easy guide was so cool:

import argparse

parser = argparse.ArgumentParser(description='Script so useful.')
parser.add_argument("--opt1", type=int, default=1)
parser.add_argument("--opt2")

args = parser.parse_args()

opt1_value = args.opt1
opt2_value = args.opt2

run like:

python myScript.py --opt2 = 'hi'