kdrerzeugen

import random

kdnr = ["K", "D", 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]  #K & D for index 1 & 2
randomnr = 0
qs = 0 #Quersumme

for i in range(2, 10):  #for loop for the positions 3-10
    randomnr = random.randint(1, 9)  #random number for kdnr
    kdnr[i] = str(randomnr)  #randomnr for position i in kdnr
    qs = qs + randomnr
    if qs < 10:
        kdnr[10] = "0" #second last digit is set to 0
        kdnr[11] = str(qs)[0] #qs goes to last position of kdnr
    else:
        kdnr[10] = str(qs)[:1]  #first digit of qs at second last position of kdnr
        kdnr[11] = str(qs)[1]  #second digit of qs at last position of kdnr

print("Ihre Kundennummer lautet: " + ''.join(kdnr))