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from random import randint
import string

LETTERS = {ord(d): str(i)
           for i, d in enumerate(string.digits + string.ascii_uppercase)}


def _number_iban(iban):
    return (iban[4:] + iban[:4]).translate(LETTERS)


def generate_iban_check_digits(iban):
    number_iban = _number_iban(iban[:2] + '00' + iban[4:])
    return '{:0>2}'.format(98 - (int(number_iban) % 97))


def valid_iban(iban):
    return int(_number_iban(iban)) % 97 == 1


if __name__ == '__main__':
    c = 0
    cmax = 50000
    nrmax = 10**10
    print(nrmax)
    my_checksum = input('Checksum (the first four characters): ')
    my_blz = input('Bank code (8 digits): ')
    my_example = ''
    for i in range(0, cmax):
        my_nr = '%010d' % randint(0, 9999999999)
        my_iban = my_checksum + my_blz + my_nr
        if (generate_iban_check_digits(my_iban) == my_iban[2:4] and valid_iban(my_iban)):
            c += 1
            if (c == 1):
                my_example = my_iban
    print('There are about {} account numbers for the checksum and the bank code {}. One of them is: {}.'.format(
        (float(c)/cmax)*nrmax, my_checksum + my_blz, my_example))

Code: Alles auswählen

Checksum (the first four characters): DE34
Bank code (8 digits): 50010517
There are about 99000000.00000001 account numbers for the checksum and the bank code DE3450010517. One of them is: DE34500105170123598050.