deal.py

#!/usr/bin/env python
# coding: utf-8
# http://ameblo.jp/programming/entry-10001721422.html
class Cards:
    @classmethod
    def deal(cls, num, string):
        cds = [""]*num
        for i in xrange(len(string) / num):
            for j in xrange(num):
                cds[j] += string[i*num+j]
        return cds

def test(num, string, result):
    assert Cards.deal(num, string) == result

if __name__ == '__main__':
    test(3, "123123123", ["111","222","333"])
    test(4, "123123123", ["12","23","31","12"])
    test(10, "123123123", [""]*10)
    test(4, "", [""]*4)