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Expert Python Programming – Fourth Edition

You're reading from   Expert Python Programming – Fourth Edition Master Python by learning the best coding practices and advanced programming concepts

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Product type Paperback
Published in May 2021
Publisher Packt
ISBN-13 9781801071109
Length 630 pages
Edition 4th Edition
Languages
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Authors (3):
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Michał Jaworski Michał Jaworski
Author Profile Icon Michał Jaworski
Michał Jaworski
Tarek Ziade Tarek Ziade
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Tarek Ziadé Tarek Ziadé
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Tarek Ziadé
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Toc

Table of Contents (16) Chapters Close

Preface 1. Current Status of Python 2. Modern Python Development Environments 3. New Things in Python 4. Python in Comparison with Other Languages 5. Interfaces, Patterns, and Modularity FREE CHAPTER 6. Concurrency 7. Event-Driven Programming 8. Elements of Metaprogramming 9. Bridging Python with C and C++ 10. Testing and Quality Automation 11. Packaging and Distributing Python Code 12. Observing Application Behavior and Performance 13. Code Optimization 14. Other Books You May Enjoy
15. Index

Intercepting the class instance creation process

There are two special methods concerned with the class instance creation and initialization process. These are __init__() and __new__().

The __init__() method is the closest to the concept of the constructor found in many object-oriented programming languages. It receives a fresh class instance together with initialization arguments and is responsible for initializing the class instance state.

The special method __new__() is a static method that is actually responsible for creating class instances. This __new__(cls, [,...]) method is called prior to the __init__() initialization method. Typically, the implementation of the overridden __new__() method invokes its superclass version using super().__new__() with suitable arguments and modifies the instance before returning it.

The __new__() method is a special-cased static method so there is no need to declare it as a static method using the staticmethod decorator...

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