感觉python抽象程度要比c高一些

```

yield [1]
L = s = [1,1]
while True:
    k = n -1
    L = [1,1]
    e = 1
    while k:
        L.insert(e,s[e]+s[e-1])
        k = k-1
        e = e+1
    s = L
    yield L