使用Python3编写杨辉三角形

def sanjiaoxing():
    N = [1]
    while True:
        yield N
        N.append(1)
        N = [N[i] + N[i - 1] for i in range(len(N))]
f = 0
for i in sanjiaoxing():
    print(i)
    f += 1
    if f == 200:
        break