我已经用python编写了下面给出的同心正方形代码。但是我没有得到想要的输出

Question

n=int(input())


answer=[[1]]
for i in range(2, n+1):
    t=[i]*((2*i)-3)
    t1=[i]*((2*i)-3)
    answer.insert(0, t)
    answer.append(t1)
    for a in answer:
        a.insert(0,I)
        a.append(i)

answerfinal=[]
for a in answer:
    answerfinal.append("".join(str(a)))
for a in answerfinal:
    print(''.join(map(str, a)), end='\n')

I want the below output:

44444

4333334

4322234

4321234

4322234

4333334

44444

但我得到的结果如下：

[4,4,4,4,4,4,4,4]

[4,3,3,3,3,3,3,4]

[4,3,2,2,2,3,4]

[4,3,2,1,2,3,4]

[4,3,2,2,2,3,4]

[4,3,3,3,3,3,3,4]

[4,4,4,4,4,4,4,4]

有人能告诉我我在代码中犯了什么错误吗

Answer 1

只需从第二个for语句中删除join方法：

n=int(input())


answer=[[1]]
for i in range(2, n+1):
    t=[i]*((2*i)-3)
    t1=[i]*((2*i)-3)
    answer.insert(0, t)
    answer.append(t1)
    for a in answer:
        a.insert(0, i)
        a.append(i)

answerfinal=[]
for a in answer:
    answerfinal.append(a)
for a in answerfinal:
    print(''.join(map(str, a)), end='\n')