No, there is no correct or wrong, your function should work one way and the built-in method works in another way.

Then you should have seen that it only works with alphabetic chars and nothing more.

Did you read the docs about the method you use?

Your code returns False instead of True for that input.

Usually such things happen when your solution is incorrect. It is very difficult for us to tell why your solution is incorrect, because we do not know your solution.

Maybe this article will explain some things?