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curriculum/challenges/english/blocks/learn-how-to-work-with-numbers-and-strings-by-implementing-the-luhn-algorithm/656b481ec4976439565a78b2.md

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--description--

Just as the step is optional, a start at 0 and an end at the end of the slice are optional:

python
my_string = 'camperbot'
camperbot = my_string[::]

Assign the reverse of the full card_number string to the card_number_reversed variable.

--hints--

You should have card_number_reversed = card_number[::-1] within the verify_card_number function.

js
({
    test: () => {
        const transformedCode = code.replace(/\r/g, "");
        const verify_card_number = __helpers.python.getDef("\n" + transformedCode, "verify_card_number");
        const { function_body } = verify_card_number;

        assert.match(function_body, /card_number_reversed\s*=\s*card_number\s*\[\s*:\s*:\s*-1\s*\]/);
    }
})

--seed--

--seed-contents--

py
--fcc-editable-region--
def verify_card_number(card_number):
    sum_of_odd_digits = 0
    card_number_reversed = card_number[-1:-5:-1]
    print(card_number_reversed)
    
--fcc-editable-region--
def main():
    card_number = '4111-1111-4555-1142'
    card_translation = str.maketrans({'-': '', ' ': ''})
    translated_card_number = card_number.translate(card_translation)

    print(translated_card_number)

    verify_card_number(translated_card_number)

main()