python abstract base classes
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Abstract Base Classes (ABCs) in Python provide a way to define abstract classes with abstract methods. Abstract classes are classes that cannot be instantiated and are meant to be subclassed by concrete classes. ABCs help in defining a common interface for a group of related classes.
In this tutorial, we will cover the following topics:
An abstract class is a class that cannot be instantiated on its own. It is meant to be subclassed by other classes, which then provide concrete implementations for the abstract methods defined in the abstract class.
To create abstract classes and methods, Python provides the ABC (Abstract Base Class) module, which is part of the abc module.
Abstract methods are methods declared in the abstract class but do not have an implementation. Subclasses are required to provide concrete implementations for these abstract methods.
To create a concrete class that inherits from an abstract class, you need to provide implementations for all abstract methods.
You can also define abstract properties in abstract classes using the @property decorator.
Let's put everything together with an example:
In this example, Shape is an abstract class with abstract methods area and perimeter. The Circle and Square classes are concrete implementations of the Shape abstract class, providing specific implementations for the abstract methods.
This tutorial covers the basics of Python Abstract Base Classes. Using ABCs can help you define clear and structured class hierarchies in your Python programs.
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