#!/usr/local/bin/python2
def fizzbuzz(n): 
    for i in range(1, n+1): 
        if   i % 15 == 0: yield 'FizzBuzz' 
        elif i %  5 == 0: yield 'Buzz' 
        elif i %  3 == 0: yield 'Fizz' 
        else:             yield i

print (None or '') is ''