How to make the randint function exclude numbers with repeated digits? [duplicate]

How do I make the randint function not generate a specific list of numbers? I have to create a random bankcard code generator without it generating numbers with 4 repeated digits like '1111' '2222'.

import random

bank_codes = int(input("Hur många koder ska genereras: "))
code = 0
unwanted_codes = [0000, 1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999]

while code < bank_codes:
    code += 1
    a = str(random.randint(1, 10000))

    if len(a) == 3:
        print('0' + a)

    elif len(a) == 2:
        print('00' + a)

    elif len(a) == 1:
        print('000' + a)

    else:
        print(a)