Fixed modulo 10 algorithm

luhn_algo.py

@@ -1,41 +1,38 @@
 #!/usr/bin/env python
 # Luhn Algorithm Example - Developed by acidvegas in Python (https://git.acid.vegas/msr90)
 
-def modulus10(card_number: str) -> str:
-    '''
-    Validate a card number using the Luhn Algorithm
+def modulo10(card_number: str) -> str:
+	'''
+	Validate a card number using the Luhn Algorithm
 
-    :param card_number: The card number to validate
-    '''
-   
-    digits = [int(d) for d in card_number]
-    total_sum = 0
-    reversed_digits = digits[::-1]
+	:param card_number: The card number to validate
+	'''
 
-    for i in range(len(reversed_digits)):
-        digit = reversed_digits[i]
+	digits = [int(d) for d in card_number]
+	total_sum = 0
 
-        if i % 2 != 0:
-            digit = digit * 2
+	for i, digit in enumerate(reversed(digits)):
+		if i % 2 == 0:
+			digit = digit * 2
 
-        if digit > 9:
-            digit -= 9
+			if digit > 9:
+				digit -= 9
 
-        total_sum += digit
+		total_sum += digit
 
-    check_digit = (10 - (total_sum % 10)) % 10
-    full_card_number = card_number + str(check_digit)
-    
-    if (total_sum + check_digit) % 10 != 0:
-        raise ValueError('failed luhn check (non-divisible by 10)')
+	check_digit = (10 - total_sum % 10) % 10
+	full_card_number = card_number + str(check_digit)
 
-    return full_card_number
+	if (total_sum + check_digit) % 10 != 0:
+		raise ValueError('failed luhn check (non-divisible by 10)')
+
+	return full_card_number
 
 
 if __name__ == '__main__':
-    card_number = input('Enter your card number without the last digit:')
+	card_number = input('Enter your card number without the last digit: ')
 
-    if not card_number.isdigit():
-        raise ValueError('invalid card number')
-    
-    print(f'Full card number: {modulus10(card_number)}')
+	if not card_number.isdigit():
+		raise ValueError('invalid card number')
+
+	print(f'Full card number: {modulo10(card_number)}')