Luhn Formula - CC Validator

Question

https://code.sololearn.com/cd7IZRSsbLNi/?ref=app

It's passing 4/7 tests. When I test to print the sum, it's coming out wrong. For example, the first test case the sum should be a multiple of 10 to print valid, but it's coming out as 59.

Answer 1

Anna Swann ,

there is a small issue in the second step of the calculation, where we should multiply each second digit by 2.

#for num in range(0, len(holder2), 2): # your code starts with the first digit

for num in range(1, len(holder2), 2): # this should work since it starts with the second digit

> scroll down in the task description to the bottom - have a look at the sample ...

Answer 2

Lochard ,

> in the bottom of the app you can see the section *community*. click on it

> there you can find the *code coach*. in this section click on *view more*

> all the code coach exercises will be shown as an overview. use search bar on top, input *credit card*

> click on this item, then you will see the task description and also the code editor

Answer 3

Thank you, Lothar! That worked!

Answer 4

@Lothar May I ask how to see the task description?

Answer 5

I can see your code but I cannot see the question.
I looked up Luhn Formula, it seems quite different from your code.