http://logsoku.com/thread/hatsukari.2ch.net/news/1318598633/400

gistfile1.py

def deal(n, xs):
    ys = [''] * n
    for i in range(len(xs) // n * n):
        ys[i % n] += xs[i]
    return ys

assert deal(3, '123123123') == ['111', '222', '333']
assert deal(3, '123123123') == ['111', '222', '333']
assert deal(4, '123123123') == ['12', '23', '31', '12']
assert deal(6, '012345012345012345') == ['000', '111', '222', '333', '444', '555']
assert deal(4, '111122223333') == ['123', '123', '123', '123']
assert deal(1, '012345012345012345') == ['012345012345012345']
assert deal(6, '01234') == ['', '', '', '', '', '']
assert deal(2, '') == ['', '']