I have a problem with the credit validator in code coach

Question

I keep failing the test cases in the credit validator problem
Here is my attempt

card_number = list(input().strip())

# Remove the last digit from the card number
check_digit = card_number.pop()

# Reverse the order of the remaining numbers
card_number.reverse()

processed_digits = []

for index, digit in enumerate(card_number):
if index % 2 == 0:
doubled_digit = int(digit) * 2

# Subtract 9 from any results that are greater than 9
if doubled_digit > 9:
doubled_digit = doubled_digit - 9

processed_digits.append(doubled_digit)
else:
processed_digits.append(int(digit))

total = int(check_digit) + sum(processed_digits)

# Verify that the sum of the digits is divisible by 10
if total % 10 == 0:
print("valid")
else:
print("not valid")

Answer 1

here is the task description:

https://code.sololearn.com/c57Q51G5pJ3T/?ref=app

MATOVU CALEB BTW: why do you remove the last digit by using pop() and then later add it to the sum ?

Answer 2

MATOVU CALEB Please post the question here.

Answer 3

num = list(input()[::-1])

for i in range(1, len(num)+1, 2):
num[i] = str((int(num[i]))*2)

num_2 = num
for i in range(0, len(num_2)):
if int(num_2[i]) > 9:
num_2[i] = str(int(num_2[i])-9)

print('valid' if len(num_2) == 16 and sum([int(i) for i in num_2 ]) % 2 == 0 else 'not valid')