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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1. def CardChecksum(CardNum):
2. CardSum = 0
3. NumDigits = len(CardNum)
4. OddOrEven = NumDigits & 1
5. for DigCount in range(0, NumDigits):
6. Digit = int(CardNum[DigCount])
7. if not ((DigCount & 1) ^ OddOrEven):
8. Digit = Digit * 2
9. if Digit > 9:
10. Digit = Digit - 9
11. CardSum = CardSum + Digit
12. return ((CardSum % 10) == 0)