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Second(more readable) solution in Clear category for Luhn Algorithm: Credit Card Checker by Orthomonalus
def checker(card: str) -> bool:
reverse_digits = card.replace(' ', '')[::-1]
total = 0
for i, digit in enumerate(reverse_digits):
num = int(digit)
if i % 2 == 1:
num *= 2
if num > 9:
num -= 9
total += num
return total % 10 == 0
print("Example:")
print(checker("4137 8947 1175 5904"))
# These "asserts" are used for self-checking
assert checker("4137 8947 1175 5904") == True
assert checker("5468 1234 5678 9123") == False
assert checker("4539 1488 0343 6467") == True
print("The mission is done! Click 'Check Solution' to earn rewards!")
Dec. 28, 2024
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