Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 24

Python
1

Tell us what’s happening:

The code is right, he needs the for loop within the function, and it’s already there

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)


# User Editable Region

    sum_of_even_digits = 0
    even_digits = card_number_reversed[1::2]
    
    for x in even_digits :
        print(x)

# 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)

main()

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Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 24

1 Like
2

Welcome to the forum @zyad91248

Try removing the space before the colon.

Happy coding

3

You’re close. Here are few hints to help you out.

  1. You used for x in even_digits instead of the default for digit in even_digits, it’s always better to use the expected variable name for more clean code.
  2. the even_digits loop only prints the value but it’s missing the processing logic doubling each digit, subtracting 9 if needed completing that part of code, which is essential to finish the algorithm as show in the default template code.

Let us know if this helps! Good Luck!

4

that’s dealt in future steps, it is too much to complete this step succesfully