acidvegas/msr90
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Fixed modulo 10 algorithm

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This commit is contained in:
Dionysus 2024-05-12 04:01:54 -04:00
parent f3a54fc25c
commit 57c6f1439a
Signed by: acidvegas
GPG Key ID: EF4B922DB85DC9DE
1 changed files with 24 additions and 27 deletions
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13
luhn_algo.py
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@ -1,7 +1,7 @@
#!/usr/bin/env python #!/usr/bin/env python
# Luhn Algorithm Example - Developed by acidvegas in Python (https://git.acid.vegas/msr90) # Luhn Algorithm Example - Developed by acidvegas in Python (https://git.acid.vegas/msr90)
def modulus10(card_number: str) -> str: def modulo10(card_number: str) -> str:
''' '''
Validate a card number using the Luhn Algorithm Validate a card number using the Luhn Algorithm
@ -10,12 +10,9 @@ def modulus10(card_number: str) -> str:
digits = [int(d) for d in card_number] digits = [int(d) for d in card_number]
total_sum = 0 total_sum = 0
reversed_digits = digits[::-1]
for i in range(len(reversed_digits)): for i, digit in enumerate(reversed(digits)):
digit = reversed_digits[i] if i % 2 == 0:
if i % 2 != 0:
digit = digit * 2 digit = digit * 2
if digit > 9: if digit > 9:
@ -23,7 +20,7 @@ def modulus10(card_number: str) -> str:
total_sum += digit total_sum += digit
check_digit = (10 - (total_sum % 10)) % 10 check_digit = (10 - total_sum % 10) % 10
full_card_number = card_number + str(check_digit) full_card_number = card_number + str(check_digit)
if (total_sum + check_digit) % 10 != 0: if (total_sum + check_digit) % 10 != 0:
@ -38,4 +35,4 @@ if __name__ == '__main__':
if not card_number.isdigit(): if not card_number.isdigit():
raise ValueError('invalid card number') raise ValueError('invalid card number')
print(f'Full card number: {modulus10(card_number)}') print(f'Full card number: {modulo10(card_number)}')