Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 17

Python
1

Tell us what’s happening:

what is the exact index that I have to write on the index operator from “odd_digits”.

I also dont know what the instructions refere with “that contains every other digit of the card_number_reversed strin”

Your code so far


# User Editable Region

def verify_card_number(card_number):
    odd_digits = card_number_reversed[]
    sum_of_odd_digits = 0
    card_number_reversed = card_number[::-1]
    

# 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 17

2

Have you tried submitting an answer?
What error message do you get if you submit incorrect code?

Here’s a useful article which explains how slice string works in Python.

3

the message error says: Your code raised an error before any tests could run. Please fix it and try again.

4

[quote=“romo.emi19, post:1, topic:682900”]
odd_digits = card_number_reversed

in this line of code is the error

5

Ah, yes, that would raise an error, because you have empty brackets.
I’d recommend reading up on slice strings, as it’s an important concept to get your head around.

HINT: If, you’re still stuck, try removing the empty brackets and see what error message you get next time.

6

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