Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 33

Python
1

Tell us what’s happening:

Is my function inside the main() ? I can’t spot my error, the code runs flawlessly but it keep throwing error messages at me.

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]

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

    sum_of_even_digits = 0
    even_digits = card_number_reversed[1::2]
    for digit in even_digits:
        number = int(digit) * 2
        if number >= 10:
            number = (number // 10) + (number % 10)
        sum_of_even_digits += number
    total = sum_of_odd_digits + sum_of_even_digits
    print(total)
    return total % 10 == 0

# User Editable Region

def main():
    card_number = '4111-1111-4555-1142'
    card_translation = str.maketrans({'-': '', ' ': ''})
    translated_card_number = card_number.translate(card_translation)
    verify_card_number(translated_card_number)
    if verify_card_number(translated_card_number) == True:
        print('VALID!')
    else:
        print('INVALID!')

# User Editable Region


main()

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Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 33

2

What error message do you get?

3

At the console it print: " 50 50 VALID!" But at the hints that appears when you get the answer wrong some times it says: “You should have if verify_card_number(translated_card_number): within the main function.”

4

and do you have this? something similar doesn’t count, it needs to be exactly this

5

Look at the hint carefully and review what you have.

You can also review truthy and falsy values in js for more context:
https://www.geeksforgeeks.org/explain-the-concept-of-truthy-falsy-values-in-javascript/