python学习-利用生成器生成杨辉三角

#!/usr/bin/env python
#-*- coding:utf-8 -*-

def triangles():
L = [1]
while True:
yield L
L = [1] + [L[i]+L[i+1] for i in range(len(L)-1)] + [1]

if __name__ == '__main__':
n = 0
for t in triangles():
print(t)
n = n + 1
if n == 10:
break