Tell us what’s happening:
I know the answer is :
—solution removed—
I do not understand where the first and second characters come from. If X is the first number in the starting index and the Y is supposed to be the ending index.
Why is the answer not:
card_number_reversed=card_number[-2: -1:-1]
because in reverse the four numbers are -2(first), -4, -1, -1(last)
Your code so far
# User Editable Region
def verify_card_number(card_number):
sum_of_odd_digits = 0
card_number_reversed = card_number[0:4:2]
print(card_number_reversed)
# User 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()
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Challenge Information:
Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 13