Example Abstract Base Class Python

The shape class has area method decorated by abstractmethod.

Example abstract base class python. They are as follows. Self value value super init abstractmethod def do something self. So why would you use abstract base classes.

Callable call container contains hashable hash iterable iter sized len these abstract base classes contain one abstract method each. From abc import abc class myabc abc. The following python code uses the abc module and defines an abstract base class.

Let s consider an example of the len method. If you are a python beginner then i highly recommend this book. Sub classes can inherit from an abstract base class and implement methods.

An abstract base class cannot be instantated no object creation an abstract base class has methods but no implementation. This module is called for obvious reasons abc. A rectangle class now uses above shape class as its parent and implementing the abstract area method.

Pass note that the type of abc is still abcmeta therefore inheriting from abc requires the usual precautions regarding metaclass usage as multiple inheritance may lead to metaclass conflicts. Python has five abstract base classes.