[转载] 打印三角形数据输出

输出结果：

this is [1]
this is [1, 1]
this is [1, 2, 1]
this is [1, 3, 3, 1]
this is [1, 4, 6, 4, 1]
this is [1, 5, 10, 10, 5, 1]
this is [1, 6, 15, 20, 15, 6, 1]
this is [1, 7, 21, 35, 35, 21, 7, 1]
this is [1, 8, 28, 56, 70, 56, 28, 8, 1]
this is [1, 9, 36, 84, 126, 126, 84, 36, 9, 1]

def triangles():
    L = [1]
    while True:
        yield L
        L1 = L[:]
        L = []
        i = 0
        while i < len(L1) - 1:
            L.append(L1[i] + L1[i+1])
            i = i + 1
        L.insert(0, 1)
        L.append(1)
        
if __name__ == "__main__": 
    n = 0
    for t in triangles():
        print(" this is %s" %t)
        n = n + 1
        if n == 10:
            break