Figure out if a number is happy

ishappy.py

# -*- coding: utf-8 -*


def ishappy_recurse(num):

    if num == 1:
        print "{} is so happy!".format(num)

    digits_str = [str(d) for d in str(num)]
    digits_int = [int(d) for d in str(num)]
    summ = sum([d * d for d in digits_int])
    math_str = '² + '.join(digits_str) + '² = ' + str(summ)
    print math_str
    ishappy_recurse(summ)


def ishappy_loop(num, max_iterations=10000):
    starting_num = num
    iterations = 0

    while num != 1 and iterations < max_iterations:
        iterations += 1

        digits_str = [str(d) for d in str(num)]
        digits_int = [int(d) for d in str(num)]
        num = sum([d * d for d in digits_int])
        math_str = '² + '.join(digits_str) + '² = ' + str(num)
        print math_str

    if num == 1:
        print "{} is so happy! :D".format(starting_num)
    else:
        print "{} is UNHAPPY!! >:(".format(starting_num)


def ishappy(num, **kwargs):
    ishappy_loop(num, **kwargs)


if __name__ == '__main__':
    import sys

    kwargs = {}
    if len(sys.argv) > 2:
        kwargs['max_iterations'] = int(sys.argv[2])

    ishappy(sys.argv[1], **kwargs)