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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 1. Section 1: Tighter Integration Via Special Methods FREE CHAPTER
2. Preliminaries, Tools, and Techniques 3. The __init__() Method 4. Integrating Seamlessly - Basic Special Methods 5. Attribute Access, Properties, and Descriptors 6. The ABCs of Consistent Design 7. Using Callables and Contexts 8. Creating Containers and Collections 9. Creating Numbers 10. Decorators and Mixins - Cross-Cutting Aspects 11. Section 2: Object Serialization and Persistence
12. Serializing and Saving - JSON, YAML, Pickle, CSV, and XML 13. Storing and Retrieving Objects via Shelve 14. Storing and Retrieving Objects via SQLite 15. Transmitting and Sharing Objects 16. Configuration Files and Persistence 17. Section 3: Object-Oriented Testing and Debugging
18. Design Principles and Patterns 19. The Logging and Warning Modules 20. Designing for Testability 21. Coping with the Command Line 22. Module and Package Design 23. Quality and Documentation 24. Other Books You May Enjoy

Using standard library mixin classes

The standard library makes use of mixin class definitions. There are several modules that contain examples, including io, socketserver, urllib.request, contextlib, and collections.abc. Next, we'll look at an example using mixing features of the Enum class in the enum module.

When we define our own collection based on the collections.abc abstract base classes, we're making use of mixins to ensure that cross-cutting aspects of the containers are defined consistently. The top-level collections (Set, Sequence, and Mapping) are all built from multiple mixins. It's very important to look at section 8.4 of the Python Standard Library to see how the mixins contribute features as the overall structure is built up from pieces.

Looking at just one line, the summary of Sequence, we see that it inherits from Sized, Iterable, and Container...

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