Nothing needs to be defined for this class. This is because it inherits the constructor of the Exception class that it is extending.

class customException(Exception):
    # Nothing needs to be defined for this class. This is because it inherits the constructor of the `Exception` class that it is extending.
		 pass

• We can write a function that raises the new custom exception: ``` class customException(Exception): pass

def causeError(): raise CustomException(‘You called the causeError function!’)

causeError()

* Custom exceptions are usually lighweight classes, with very little special attributes, methods and so on.
* An example of writing an HTTP exception with a static staus code:

class httpException(Exception): statusCode = None messages = None # We overrite the parent constructor below: def init(self): super().init(f’Status code: {self.statusCode} and message is: {self.message}’)

Then we need a few child classes that extend the HTTP exception:

class NotFound(HttpException): statusCode = 404 message = ‘Resource not found’

class ServerError(HttpException): statusCode = 500 message = ‘Server is down’

def raiseServerError(): raise ServerError()

raiseServerError() ```

• These custom exceptions help keep code organised, are great at documenting issues and what caused them.
• They help separate common excepted error from issues that require a developer’s attention.