Reverse the order of the remaining digits.This number is called the checking digit, and it will be excluded from most of our calculations. Remove the rightmost digit from the card number.The way we're going to use the algorithm is as follows: The purpose of the algorithm is to identify potentially mistyped numbers, because it can determine whether or not it's possible for a given number to be the number for a valid card. This algorithm is actually used in real-life applications to test credit or debit card numbers as well as SIM card serial numbers. The algorithm we're going to use to verify card numbers is called the Luhn algorithm, or Luhn formula. Remember, you can always look back at your notes, or back the previous days' posts if you forget how something works! A quick explanation of the algorithm After that, we'll present a model solution as part of a code along walkthrough.Īs always, try your best to do this on your own, but if you get really stuck, follow along with the solution until you feel like you can finish it yourself. You'll find this explanation below, along with the project brief. ![]() ![]() ![]() It's actually a lot easier than you might think, and I'm going to explain the algorithm we're going to use in detail to help you out. When the program is complete, we're going to be able to determine whether a given card number is valid or not. Welcome to the day 9 project for the 30 Days of Python series! For this project, we're going to be writing a simple credit card validator.
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