ifizzbuzz.py

#-*- coding:utf8 -*-
# FizzBuzz遅延評価版

from itertools import repeat, starmap, count
try:
    range = xrange
except NameError:
    pass
else:
    from itertools import imap as map
    from itertools import izip as zip
    
def ifizzbuzz(n):
    return (item or str(i) for i, item in zip(
        count(1), map(''.join, starmap(lambda x,y:
            (x[0] * x[1], y[0] * y[1]), zip(
                zip(repeat("Fizz"),
                    map(lambda i: not i%3, range(1, n+1))),
                zip(repeat("Buzz"),
                    map(lambda i: not i%5, range(1, n+1))))))))

if __name__ == '__main__':
    from itertools import islice
    end = 1000000
    start = end - 50
    result = ifizzbuzz(end)
    print(' '.join(list(islice(result, start, end, None))))

「((i%3==0)'Fizz' + (i%5==0)'Buzz' or str(i) for i in range(1, n+1))」の倍くらい遅いけど泣かない。