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

Python
1

Tell us what’s happening:

I followed all the instructions, it marks that I need a print(digit) within the function, which I have. I have tried indented and unindented.

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)
    print(sum_of_odd_digits)


# User Editable Region

    sum_of_even_digits = 0
    even_digits = card_number_reversed[1::2]
    for digit in even_digits:
        sum_of_even_digits += int(digit)
        print(digit)
  

# 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()

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36

Challenge Information:

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

2

Hi @70N10_JC

Loop over the even digits and print each to the console.

You are not asked to perform any calculations.

Happy coding

1 Like
3

Tell us what’s happening:

Changed the += to =,
mardks the sema mistake:
You should have print(digit) within the for loop.
It is there! Tried indented and unindented

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)
    print(sum_of_odd_digits)


# User Editable Region

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

# 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()

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36

Challenge Information:

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

4

Hi @70N10_JC

You should have print(digit) within the for loop.

The print call needs to go in the loop.

You need only the print call in the loop.

Happy coding

2 Likes
5

You will need to move your even-digit block inside the verify_card_number function, right after the odd-digits section. Make sure print(digit)is literally part of that function body (same indentation level as the other loop).

1 Like