The CardChecksum function returns 1 for valid cards and 0 for invalid cards, after performing a check using the Luhn algorithm which validates all major credit cards.
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def CardChecksum(CardNum):CardSum = 0NumDigits = len(CardNum)OddOrEven = NumDigits & 1for DigCount in range(0, NumDigits):Digit = int(CardNum[DigCount])if not ((DigCount & 1) ^ OddOrEven):Digit = Digit * 2if Digit > 9:Digit = Digit - 9CardSum = CardSum + Digitreturn ((CardSum % 10) == 0)
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