Created
December 8, 2020 17:24
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def luhn_checksum(card_number): | |
def digits_of(n): | |
return [int(d) for d in str(n)] | |
digits = digits_of(card_number) | |
odd_digits = digits[-1::-2] | |
even_digits = digits[-2::-2] | |
checksum = 0 | |
checksum += sum(odd_digits) | |
for d in even_digits: | |
checksum += sum(digits_of(d*2)) | |
return checksum % 10 | |
print('Valid') if luhn_checksum("4532015112830366")==0 else print('Invalid') |
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