Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 35

Python
1

Tell us what’s happening:

how do i complete question 35 because i have already remove the print call but how do i change the card_number to be valid?

Your code so far


# User Editable Region

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
    return total % 10 == 0

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

# User Editable Region

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Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 35

1 Like
2

I forget which digit exactly was changed relative to the valid card number, but one of the last two 1’s used to be a 2.

3

i have already change to ‘2’ but is still not working eventhough the output is ‘VALID!’

4

you have an extra space here

1 Like