Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 21

Python
1

Tell us what’s happening:

Instead of converting digit to an integer, can I redeclare the variable as such?

    digit = int(odd_digits)

Your code so far

def verify_card_number(card_number):
    sum_of_odd_digits = 0
    card_number_reversed = card_number[::-1]
    odd_digits = card_number_reversed[::2]


# User Editable Region

    for digit in odd_digits:
        digit = int(odd_digits)
        sum_of_odd_digits += digit

        print(sum_of_odd_digits)
        
def main():

# User Editable Region

    card_number = '4111-1111-4555-1142'
    card_translation = str.maketrans({'-': '', ' ': ''})
    translated_card_number = card_number.translate(card_translation)

    verify_card_number(translated_card_number)

main()

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Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 21

2

odd_digits is a string with numbers and some - characters. You cannot use int on a string with that value because it would raise an error.

I think what you thought to do was

    for digit in odd_digits:
        digit = int(digit)
        sum_of_odd_digits += digit

In principle, it works. But why would you declare it again? It’s redundant.

3

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