Abstract classes are a powerful feature in object-oriented programming that allow developers to define classes that cannot be instantiated and are designed to be subclassed. This concept is useful for creating base classes that define a common interface and functionality for other derived classes. In Python, abstract classes are supported through the `abc` module, which stands for Abstract Base Classes. This module provides a mechanism for defining abstract base classes and is an integral part of Python's class system.

Understanding Abstract Classes in Python

Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared, but contains no implementation. When an abstract class is subclassed, the derived class usually provides implementations for all the abstract methods in its parent class, otherwise, it will also be abstract and can't be instantiated.

Key Features of Abstract Classes

1. Cannot Be Instantiated: An abstract class is not meant to be instantiated directly. An attempt to create an object using an abstract class will result in an error. It is designed to provide a template for other classes.
2. Contain Abstract Methods: An abstract class can have one or more abstract methods. These methods are usually defined but are not implemented in the abstract class.
3. Inheritance Requirement: Concrete subclasses that inherit from an abstract class must override and implement all abstract methods to become non-abstract themselves.

Technical Explanation of Abstract Classes using `abc` Module

The `abc` module in Python provides the tools necessary to create abstract base classes. Here's how you can define and use abstract classes in Python:

Step 1: Importing the `abc` Module

First, you need to import the `ABC` class and `abstractmethod` decorator from the `abc` module.

• Defines Contract for Subclasses: Abstract classes define a clear and explicit contract for what derived classes need to implement. This ensures consistency across different implementations.
• Enhances Code Reusability: By defining common interfaces and utilities inside abstract classes, you can share code efficiently across subclasses.
• Eases Maintenance: By segregating the common interface (abstract class) from the implementation details (concrete classes), you can more easily maintain existing code and extend functionality by adding new subclasses.