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Mastering Object-Oriented Python

You're reading from   Mastering Object-Oriented Python Build powerful applications with reusable code using OOP design patterns and Python 3.7

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Product type Paperback
Published in Jun 2019
Publisher Packt
ISBN-13 9781789531367
Length 770 pages
Edition 2nd Edition
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Author (1):
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Steven F. Lott Steven F. Lott
Author Profile Icon Steven F. Lott
Steven F. Lott
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Table of Contents (25) Chapters Close

Preface
Who this book is for
What this book covers
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1. Preliminaries, Tools, and Techniques FREE CHAPTER 2. The __init__() Method 3. Integrating Seamlessly - Basic Special Methods 4. Attribute Access, Properties, and Descriptors 5. The ABCs of Consistent Design 6. Using Callables and Contexts 7. Creating Containers and Collections 8. Creating Numbers 9. Decorators and Mixins - Cross-Cutting Aspects 10. Serializing and Saving - JSON, YAML, Pickle, CSV, and XML 11. Storing and Retrieving Objects via Shelve 12. Storing and Retrieving Objects via SQLite 13. Transmitting and Sharing Objects 14. Configuration Files and Persistence 15. Design Principles and Patterns 16. The Logging and Warning Modules 17. Designing for Testability 18. Coping with the Command Line 19. Module and Package Design 20. Quality and Documentation

Abstract base classes

The core of the abstract base class (ABC) definition is defined in a module named abc. This contains the required decorators and metaclasses to create abstractions. Other classes rely on these definitions. The collections.abc module uses the abc module to create abstractions focused on collections. We'll also look at the numbers module, because it contains ABCs for numeric types. There are ABCs for I/O in the io module, too.

An abstract base class has the following features:

  • Abstract means that these classes don't contain all the method definitions required to work completely. For it to be a useful subclass, we will need to provide some method definitions.
  • Base means that other classes will use it as a superclass.
  • An abstract class provides some definitions for methods. Most importantly, the abstract base classes often provide the signatures...
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