gcd.py

'''
author: Jacob Egner
date: 2015-07-31
island: ice base

for latest versions of my solutions, see my checkio solution github repo:
https://github.com/jmegner/CheckioPuzzles

'''

import fractions
import functools
 
def greatest_common_divisor(*args):
    return functools.reduce(fractions.gcd, args)


if __name__ == '__main__':
    #These "asserts" using only for self-checking and not necessary for auto-testing
    assert greatest_common_divisor(6, 4) == 2, "Simple"
    assert greatest_common_divisor(2, 4, 8) == 2, "Three arguments"
    assert greatest_common_divisor(2, 3, 5, 7, 11) == 1, "Prime numbers"
    assert greatest_common_divisor(3, 9, 3, 9) == 3, "Repeating arguments"