根据廖雪峰老师的评论区摘录。
1：
def triangles():
L = [1]
while True:
yield L
L1 = [0] + L[:]
L = [L[i]+L1[i] for i in range(len(L))] + [1]
2：
def triangles():
L = [1]
while True:
yield L
L.append(0);
L = [L[i-1] + L[i] for i in range(len(L))]
输出结果：
# 期待输出:
# [1]
# [1, 1]
# [1, 2, 1]
# [1, 3, 3, 1]
# [1, 4, 6, 4, 1]
# [1, 5, 10, 10, 5, 1]
# [1, 6, 15, 20, 15, 6, 1]
# [1, 7, 21, 35, 35, 21, 7, 1]
# [1, 8, 28, 56, 70, 56, 28, 8, 1]
# [1, 9, 36, 84, 126, 126, 84, 36, 9, 1]
n = 0
for t in triangles():
print(t)
n = n + 1
if n == 10:
break