curriculum/challenges/english/blocks/learn-how-to-work-with-numbers-and-strings-by-implementing-the-luhn-algorithm/65687e457ab1c4cb8c3fe7c8.md
Adjust the verify_card_number call such that if it returns True, print 'VALID!' to the console. Otherwise, print 'INVALID!'.
You should have if verify_card_number(translated_card_number): within the main function.
({
test: () => {
const transformedCode = code.replace(/\r/g, "");
const main = __helpers.python.getDef("\n" + transformedCode, "main");
const { function_body } = main;
const if_statement = __helpers.python.getBlock("\n" + function_body, "if verify_card_number(translated_card_number)");
assert.exists(if_statement);
}
})
You should have print('VALID!') within the if statement.
({
test: () => {
const transformedCode = code.replace(/\r/g, "");
const if_statement = __helpers.python.getBlock("\n" + transformedCode, "if verify_card_number(translated_card_number)");
const {block_body} = if_statement;
assert.match(block_body, /print\(\s*('|")VALID!\1\s*\)/);
}
})
You should have print('INVALID!') within the else clause.
({
test: () => {
const transformedCode = code.replace(/\r/g, "");
const else_statement = __helpers.python.getBlock("\n" + transformedCode, "else");
const {block_body} = else_statement;
assert.match(block_body, /print\(\s*('|")INVALID!\1\s*\)/);
}
})
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)
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
--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)
--fcc-editable-region--
main()