generator输出杨辉三角

杨辉三角定义如下:

          1
        1   1
      1   2   1
    1   3   3   1
  1   4   6   4   1
1   5   10  10  5   1

把每一行看做一个list,试写一个generator,不断输出下一行的list:

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

n=0
for L in triangles():
    print(L)
    n=n+1
    if n==10:
        break

    原文作者:杨辉三角问题
    原文地址: https://blog.csdn.net/qq_35705269/article/details/75547113
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