Book Image

Python Object-Oriented Programming - Fourth Edition

By : Steven F. Lott, Dusty Phillips
2 (2)
Book Image

Python Object-Oriented Programming - Fourth Edition

2 (2)
By: Steven F. Lott, 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. Python Object-Oriented Programming, Fourth Edition dives deep into the various aspects of OOP, Python as an OOP language, common and advanced design patterns, and hands-on data manipulation and testing of more complex OOP systems. These concepts are consolidated by open-ended exercises, as well as a real-world case study at the end of every chapter, newly written for this edition. All example code is now compatible with Python 3.9+ syntax and has been updated with type hints for ease of learning. Steven and Dusty provide a comprehensive, illustrative tour of important OOP concepts, such as inheritance, composition, and polymorphism, and explain how they work together with Python’s classes and data structures to facilitate good design. In addition, the book also features an in-depth look at Python’s exception handling and how functional programming intersects with OOP. Two very powerful automated testing systems, unittest and pytest, are introduced. The final chapter provides a detailed discussion of Python's concurrent programming ecosystem. By the end of the book, you will have a thorough understanding of how to think about and apply object-oriented principles using Python syntax and be able to confidently create robust and reliable programs.
Table of Contents (17 chapters)
15
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16
Index

Exercises

We've looked at the concept of defining abstract classes to define some – but not all – common features of two objects. Take a quick look around to see how you can apply these principles to your own work. A script can often be restated as a class; each major step of the work a separate method. Do you have similar-looking scripts that – perhaps – share a common abstract definition? Another place to find things that are partially related is in the classes that describe data files. A spreadsheet file often has small variations in layout; this suggests they have a common abstract relationship, but a method needs to be part of an extension to handle the variations in the layouts.

When we think about the DDice class, there's yet another enhancement that would be nice. Right now, the operators are all defined for DDice instances only. In order to create a hand of dice, we need to – somewhere – use a DDice constructor. This...