How can I manually raise an exception in Python and what is the best practice for doing so?

I am trying to manually raise an exception in my Python code, but I am not sure how to do it properly. Can anyone provide an example of how to do this? I want to raise an exception with a custom error message. Here’s a code snippet of what I have tried so far:

When I run this code, I get the following error message:

Exception: Cannot divide by zero

Is there a better way to raise exceptions in Python? Any help would be appreciated.