luhn.py

import sys
import random
from pprint import pprint

def get_cc_number():
    if len(sys.argv) < 2:
        usage()
        sys.exit(1)

    return sys.argv[1]

def validate(n):
         r = [int(ch) for ch in str(n)][::-1]
         return (sum(r[0::2]) + sum(sum(divmod(d*2,10)) for d in r[1::2])) % 10 == 0

def create_giftcard(first_octet):
  # Initialize an empty list to store the valid numbers
  valid_numbers = []

  while True:
    # Generate a random 8-digit number as the second octet of the number
    second_octet = random.randint(100000001, 999999998)

    # Concatenate the first and second octets to form the 16-digit number
    number = int(str(first_octet) + str(second_octet))

    # Use the validate function to check if the number is valid
    if validate(number):
      # If the number is valid, append it to the list of valid numbers and print it along with its validation status
      valid_numbers.append(number)
      print(number, "Valid")
    else:
      # If the number is not valid, print it along with its validation status
      print(number, "Not valid")

    # If the list of valid numbers has 10 elements, return the list
    if len(valid_numbers) == 10000:
      return set(valid_numbers)


if __name__ == "__main__":
    pprint(create_giftcard(get_cc_number()))