Book Image

Python 3 Object-Oriented Programming - Third Edition

By : Dusty Phillips
Book Image

Python 3 Object-Oriented Programming - Third Edition

By: Dusty Phillips

Overview of this book

Object-oriented programming (OOP) is a popular design paradigm in which data and behaviors are encapsulated in such a way that they can be manipulated together. This third edition of Python 3 Object-Oriented Programming fully explains classes, data encapsulation, and exceptions with an emphasis on when you can use each principle to develop well-designed software. Starting with a detailed analysis of object-oriented programming, you will use the Python programming language to clearly grasp key concepts from the object-oriented paradigm. You will learn how to create maintainable applications by studying higher level design patterns. The book will show you the complexities of string and file manipulation, and how Python distinguishes between binary and textual data. Not one, but two very powerful automated testing systems, unittest and pytest, will be introduced in this book. You'll get a comprehensive introduction to Python's concurrent programming ecosystem. By the end of the book, you will have thoroughly learned object-oriented principles using Python syntax and be able to create robust and reliable programs confidently.
Table of Contents (15 chapters)

Case study

To wrap up this chapter, and the book, let's build a basic image compression tool. It will take black and white images (with 1 bit per pixel, either on or off) and attempt to compress it using a very basic form of compression known as run-length encoding. You may find black and white images a bit far-fetched. If so, you haven't enjoyed enough hours at http://xkcd.com!

I've included some sample black and white BMP images (which are easy to read data into and present plenty of opportunity to improve on file size) with the example code for this chapter.

Run-length encoding takes a sequence of bits and replaces any strings of repeated bits with the number of bits that are repeated. For example, the string 000011000 might be replaced with 04 12 03 to indicate that four zeros are followed by two ones and then three more zeroes. To make things a little more...