如何使用python库实现搭建杨辉三角？

data_lb=[]

def triangle():

    N = [1]

    while True:

           yield N 

        L = N.copy() 

        for j in range(len(L)): 

            temp = str(L[j])

            L[j] = temp

            data_lb.append(temp)

        l = ' '.join(L).center(50) 

        print(l)         

N. append(0) 

O.         N = [N[i] + N[i - 1] for i in range(len(N))]

def print_triangle(x):

    a = 0

for t in triangle(): 

        a += 1

        if a == x:

            break

print_triangle(n_you+1)  # 打印7行  a1~f6