Blog available for sell

This blog is available for sale. Please 'contact us' if interested.

The Luhn algorithm, also known as the "modulus 10" algorithm, is a checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier numbers in the United States, Canadian Social Insurance Numbers and Israel ID Numbers.

Generating check digit:

- Lets assume you have a number as: 3 - 7 - 5 - 6 - 2 - 1 - 9 - 8 - 6 - 7 - X where X is the check digit.
- Now starting from the right most digit i.e. check digit, double the every second digit. New number will be: 3 - 14 - 5 - 12 - 2 - 2 - 9 - 16 - 6 - 14 - X
- Now if double of a digit is more then 9, add the digits. So the number will become: 3 - 5 - 5 - 3 - 2 - 2 - 9 - 7 - 6 - 5 - X
- Now add all digits. 47 + X
- Multiply the non-check part by 9. So it will be 47 * 9 = 423
- Unit digit in the multiplication result is the check digit. X = 3
- Valid number would be 37562198673.

""" Python script to check validity of credit card numbers Author : https://www.pythoncircle.Com """ import sys def usage(): msg = """ usage: python3 credit_card_validator credit_card_number example: python3 credit_card_validator 34678253793 """ print(msg) def get_cc_number(): if len(sys.argv) < 2: usage() sys.exit(1) return sys.argv[1] def sum_digits(digit): if digit < 10: return digit else: sum = (digit % 10) + (digit // 10) return sum def validate(cc_num): # reverse the credit card number cc_num = cc_num[::-1] # convert to integer cc_num = [int(x) for x in cc_num] # double every second digit doubled_second_digit_list = list() digits = list(enumerate(cc_num, start=1)) for index, digit in digits: if index % 2 == 0: doubled_second_digit_list.append(digit * 2) else: doubled_second_digit_list.append(digit) # add the digits if any number is more than 9 doubled_second_digit_list = [sum_digits(x) for x in doubled_second_digit_list] # sum all digits sum_of_digits = sum(doubled_second_digit_list) # return True or False return sum_of_digits % 10 == 0 if __name__ == "__main__": print(validate(get_cc_number()))

Code is available on github.

Host your Django application for free.

0 comments on 'Python Script 8: Validating Credit Card Number - Luhn's Algorithm'

Related Articles:

Python program to convert Linux file permissions from octal number to rwx string, Linux file conversion python program, Python script to convert Linux file permissions...

Python Script to Set bing image of the day as desktop wallpaper, Automating the desktop wallpaper change to bing image of day using python code, changing desktop wallpaper using python, downloading an image using python code, updating the desktop wallpaper daily using python...

word cloud python, generating a word cloud of a text using python code, python code to generate a word cloud image of a text. Using word frequencies to generate a word cloud image using a python script...

Generating ascii art from image, converting colored image to ascii code, python script to convert image to ascii code, python code to generate the ascii image from jpg image....