argc python

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)
# If you type : py main.py 1 5
# It should give you "hello and that's your sum:6"

Here is what the above code is Doing:
1. It defines a function called hello that takes two arguments, a and b.
2. It prints out “hello and that’s your sum:”, and then the sum of a and b.
3. It checks if the __name__ variable is equal to “__main__”.
4. If it is, it sets a to the first command line argument, and b to the second.
5. It calls the hello function with a and b as arguments.