Raise Exception

Question

Can anyone please tell me what is Raise exception for?
I have read comments on the Raise exception lesson but didn't catch that

Answer 1

Raise exception, means to cause your program's execution to stop with an error message in a specific event.
For example you can raise a ValueError when you asked for user input and you got something that won't work for your program, like you need a positive number and you got zero.
It can also be used as a control flow tool, when you "catch" the exception in a try/expect block and manipulate what should happen in the program when the error is raised.
With previous example you can expect the same error you raised before and give a default value instead of the faulty user input.

Answer 2

Tibor Santa Great explanation, TY