CodeEval Multiples of a Number

multiples_of_a_number.py

import sys

def multiple_gen(n):
    original_n = n
    while True:
        n = n + original_n
        yield n

def multiples_of_a_number(x, n):
    for e in multiple_gen(n):
        if e >= x:
            return e

if __name__ == '__main__':
    test_cases = open(sys.argv[1], 'r')
    for line in test_cases:
        x, n = [int(e) for e in line.split(',')]
        print(multiples_of_a_number(x, n))

    test_cases.close()