python输出所有的对称的四位数，每个数之间用空格间隔

Question

python输出所有的对称的四位数，每个数之间用空格间隔，朋友们，帮忙解决一下

Answer 1

def is_duicheng(num):
    number = str(num)
    if len(number) != 4:
        return False
    return number[0] == number[3] and number[1] == number[2]

nums = []
for i in range(1000, 10000):
    nums.append(int(i))
duicheng_list = []
for num in nums:
    if is_duicheng(num):
        duicheng_list.append(num)
for d in duicheng_list:
    print(d, end=' ')

运行结果：