Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 33

Python
1

They are asking me to modify the ‘verified_card_number’ call in main function such that if it returns True the output should be ‘VALID!’ if it returns False the output should be ‘INVALID!’
The instruction is to include the if statement on verify_card_number within the main(), but it is already there.

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)

    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)
    return total % 10 == 0

# 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)
    if verify_card_number(translated_card_number):
        print("VALID!")
    elif:
        print("INVALID!")

# User Editable Region


main()

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Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 33

2

Hi @kaustubhkasar2014,
Welcome to fCC community. and geat work.
For conditional statements:
else is used for the last option, once all other other options have been exausted. if only two option it will be opening argument and else.
elif will be used if more than two options.

So adjust the elif and it go through.

:+1: happy coding.

3

ELIF would need a condition to check Else if <condition>:

As @OpeRichards mentioned else will execute in any other case.

4

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