Python Programming

Since you have learnt the power of inheritance, you might have realised that you can actually define your own Exception classes.

You should typically derive your custom exception from Exception (or any of its subclasses). PEP 8 also recommends that you add the word Error to the end of your exception’s name, e.g. InvalidInputError.

In its most basic form, you just create a class as normal, with Exception (or any of its subclasses) as its superclass.

class StupidInputError(Exception):
    """ Raised when a user enters a stupid input. """
    pass

try:
    user_input = input("Don't enter 'python': ")
    if user_input.lower() == "python":
        raise StupidInputError()
except StupidInputError:
    print("I told you not to enter 'python'. That's taboo!")