python 生成器

利用生成器来生成杨辉三角

看到一个很棒的代码

def triangles(n):    L = [1]    while len(L) < n+1:        yield list(L)        L.append(0)        L = [L[i - 1] + L[i] for i in range(len(L))]n = 10results = []for t in triangles(n):    print(t)    results.append(t)if 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!')