Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 19

Python
1

Tell us what’s happening:

Hello, Im stucked here for a while now and cant move on. It seems to me that odd_digits are defined, I dont understand whats the issue here

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:
    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()

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Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 19

2

Hi there and welcome to our community!

You need to fix the indentation. Your for loop can’t access odd_digits, because the variable is defined inside the verify_card_number function. The for loop should be indented so that it is also inside that function, otherwise the variable is out of scope.

1 Like
3

Thank you very much, it worked :slight_smile:

2 Likes
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