pass argument to a py file

1import sys
2
3def hello(a,b):
4    print "hello and that's your sum:", a + b
5
6if __name__ == "__main__":
7    a = int(sys.argv[1])
8    b = int(sys.argv[2])
9    hello(a, b)
10# If you type : py main.py 1 5
11# It should give you "hello and that's your sum:6"