99 problems - python - 32

Determine the greatest common divisor of two positive integer numbers.

def gcd(m,n):
    m,n = sorted([m,n])

    while m != 0:
        m, n = (n % m), m

    return n

Humorously, I resisted using a recursive algorithm. I don't know why, but it just seemed more reasonable to use a straight iterative one. Also I really like how m,n = (n%m), m saves us from having to declare a temporary variable.