python生成19位Luhn 算法号码，前六位为随机银行号码

好的，以下是前六位为随机银行号码的Python代码示例：

import random

def luhn_checksum(card_number):
    def digits_of(n):
        return [int(d) for d in str(n)]
    digits = digits_of(card_number)
    odd_digits = digits[-1::-2]
    even_digits = digits[-2::-2]
    checksum = 0
    checksum += sum(odd_digits)
    for d in even_digits:
        checksum += sum(digits_of(d*2))
    return checksum % 10

def is_luhn_valid(card_number):
    return luhn_checksum(card_number) == 0

def generate_card_number():
    prefix = str(random.randint(300000, 399999))
    card_number = prefix
    while len(card_number) < 19:
        digit = random.randint(0, 9)
        card_number = card_number + str(digit)
    checksum = luhn_checksum(card_number)
    check_digit = (10 - checksum) % 10
    return card_number + str(check_digit)

card_number = generate_card_number()
print("生成的19位Luhn算法号码为：", card_number)

该代码会先随机生成一个6位的银行号码，然后生成随机的13位数字，最后加上校验位得到19位银行卡号。生成的银行卡号会通过Luhn算法校验，保证其合法性。