Polymorphism with classes (abstract classes)

There may be occasions in which we would want to define a template of a class in terms of what that class must do, but not in terms of how it should do it – we would want to leave that to the implementation of the class. This is where we can make use of abstract classes. Let's create a script called Poly_class.py and add the following code:

It can be seen that we have an abstract class called Shape, which has an area method. The area method is not implemented in this class, but it would be implemented in the child class. The Square and Circle child classes override the area method. The area method is polymorphic, which means that if a square overrides it, it implements the area of a square and when a Circle class overrides it, it implements the area of a circle.