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One liner solution in Clear category for Luhn Algorithm: Credit Card Checker by amandel
def checker(card: str) -> bool:
return sum((2*x%9,x)[i%2 or x==9] for i,x in enumerate(int(x) for x in card if x != " "))%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!")
Sept. 9, 2024
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