def triangles():

     L = [1]

     while True:

         yield L

         L1 = [0] + L[:]

         L = [L[i]+L1[i] for i in range(len(L))] + [1]

 def triangles():

     L = [1]

     while True:

         yield L

         L.append(0);

         L = [L[i-1] + L[i] for i in range(len(L))]

# 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