See all the data is manipulated in valid_or_not which is then displayed, instead of displaying information withing valid_or_not). Thus we get: def main():Ĭardnumber = input('Enter your credit card number: ') The last digit of a credit card number is the check digit, which protects against transcription errors such as an error in a single digit or switching two. So what should we really be doing for input? First we should have a main function (see the link for more information why. def main (): Prompts user for card number nums int (input ('Number: ')) if len (str (nums)) > 16 or len (str (nums)) < 12: print ('INVALID') else: cardclassify (cardluhn (nums), nums) Luhn's. Name it something appropriate like luhn_checksum. Originally written in C (which was abysmal, you may check here if you want), I rewrote my simple credit card validation program using Python. These are the top rated real world Python examples of extracted. I am not sure what list_tweak means, but I am assuming only because I've seen this problem show up time and time again that it is the Luhn algorithm. Python CreditCardValidator - 8 examples found.
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