curriculum/challenges/english/blocks/learn-how-to-work-with-numbers-and-strings-by-implementing-the-luhn-algorithm/65687c8d86e18cbd775a53c9.md
The next part of the Luhn Algorithm is to multiply all the even digits by 2.
Within the even digit for loop, replace the print call with a variable named number and assign it the value of digit multiplied by 2.
You should have number = int(digit) * 2 within the for loop.
({
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, /number\s*=\s*int\(\s*digit\s*\)\s*\*\s*2/);
}
})
You should not have print(digit) within the for loop.
({
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;
const no_comments = __helpers.python.removeComments(function_body);
assert.notMatch(no_comments, /print\s*\(\s*digit\s*\)/);
}
})
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)
--fcc-editable-region--
sum_of_even_digits = 0
even_digits = card_number_reversed[1::2]
for digit in even_digits:
print(digit)
--fcc-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()