Numbers passed as command line arguments in python not interpreted as integers

Question

I am familiar with C, and have started experimenting in python. My question is regarding the sys.argv command. I\'ve read it is used for a command line interpre

Answer 1

You also should validate the user input:

import sys

def is_intstring(s):
    try:
        int(s)
        return True
    except ValueError:
        return False

for arg in sys.argv[1:]:
    if not is_intstring(arg):
        sys.exit("All arguments must be integers. Exit.")

numbers = [int(arg) for arg in sys.argv[1:]]
sum = sum(numbers)

print "The sum of arguments is %s" % sum