# Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 31

### Tell us what’s happening:

Describe your issue in detail here.
My code does not pass although I wrote it correctly. Could you help?

``````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 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)

/* 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()
``````

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0`

### Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 31
https://www.freecodecamp.org/learn/scientific-computing-with-python/learn-how-to-work-with-numbers-and-strings-by-implementing-the-luhn-algorithm/step-31`Preformatted text`

You appear to have created this post without editing the template. Please edit your post to Tell us what’s happening in your own words.

Indentation looks a bit off

Indentation is syntax in Python and it has to be consistent/correct

I’m having the same problem. I’ve tried all type of indentation but it’s still not working.

nvm I think it’s browser problem or smth . it’s working now