Book Image

Learning Object-Oriented Programming

By : Gaston C. Hillar
Book Image

Learning Object-Oriented Programming

By: Gaston C. Hillar

Overview of this book

Table of Contents (16 chapters)
Learning Object-Oriented Programming
About the Author
About the Reviewers

Working with simple inheritance in Python

Firstly, we will create a base class in Python. Then we will use simple inheritance to create subclasses. We will then override methods and overload comparison operators to be able to compare different instances of a specific class and its subclasses. We will take advantage of this polymorphism.

Creating classes that specialize behavior in Python

Now it is time to code all the classes in Python. The following lines show the code for the Animal class in Python. The class header doesn't specify a base class; therefore, this class inherits from an object, that is, the most base type for any class in Python. Remember that we are working with Python 3.x and that the syntax to achieve the same goal in Python 2.x is different. In Python 3.x, a class that doesn't specify a base class implicitly inherits from an object:

class Animal:
    _number_of_legs = 0
    _pairs_of_eyes = 0

    def __init__(self, age):
        self._age = age
        print("Animal created...