What's wrong with my code

Question

Im trying to solve credit card verification challenge but last 2 cases wrong:

cc=input()
c=""
if cc.isnumeric() and len(cc)==16:
for i in cc:
c=i+c
cl=list(c)
for i in range(1,16,2):
cl[i]=int(cl[i])*2
for i in range(16):
if int(cl[i])>9:
cl[i]=int(cl[i])-9
sum=0
for i in cl:
sum=sum+int(i)
valid=sum%10
if valid==0:
print("valid")
else:
print("not valid")

Answer 1

Not checked fully but you don't have else part for if input length is not equal to 16
Add else part to print not valid then try again

Answer 2

Yes worked,thank you
Cant believe i was stuck because of this hahaha

Answer 3

#check this out

cc = input()
if not cc.isdigit():
print('Not valid')
elif len(cc) != 16:
print('Not valid')
else:
print('Valid

Answer 4

Pls Save code and share link with the task description..

Answer 5

https://code.sololearn.com/cBXMjbvRF4s4/?ref=app
Task desc:
You need to verify if the given credit card number is valid. For that you need to use the Luhn test.

Here is the Luhn formula:
1. Reverse the number.
2. Multiple every second digit by 2.
3. Subtract 9 from all numbers higher than 9.
4. Add all the digits together.
5. Modulo 10 of that sum should be equal to 0.

Task:
Given a credit card number, validate that it is valid using the Luhn test. Also, all valid cards must have exactly 16 digits.

Input Format:
A string containing the credit card number you need to verify.

Output Format:
A string: 'valid' in case the input is a valid credit card number (passes the Luhn test and is 16 digits long), or 'not valid', if it's not.

Sample Input:
4091131560563988

Answer 6

Yes that was the problem in that code