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廖雪峰 python教程 

生成器章节，有一道杨辉的题目。

1        1   1      1   2   1    1   3   3   1  1   4   6   4   11   5   10  10  5   1

def triangles():    result = [1]    n = 0    while n < 20:        yield result        l = list(result)        l.append(0)        print(l)        result = [l[i] + l[i - 1] for i in range(len(l))]        n = n + 1    return 'done'

n = 0results = []for t in triangles():    print(t)    results.append(t)    n = n + 1    if n == 10:        breakif results == [    [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]]:    print('测试通过!')else:    print('测试失败!')

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