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Fluent Python

Unit 1
List Comprehension
Introduction to List ComprehensionAdvanced List Comprehension
Unit 2 • Chapter 3

Metaclasses and Class Decorators

Video Summary

Metaclasses and class decorators are powerful Python features that enable advanced customization of class creation and behavior. Metaclasses control class instantiation, allowing manipulation of class attributes and methods before the class is fully defined. They provide a way to implement design patterns and enforce coding conventions at a fundamental level. Class decorators, on the other hand, are syntactic sugar that applies modifications to classes using the @decorator notation. They offer a more concise and readable alternative to modifying classes directly, often used for tasks like adding methods or altering class behavior. While seemingly distinct, metaclasses and class decorators often work together. A metaclass can apply decorators to classes it creates, creating a powerful combination for highly customized class definitions. Understanding these tools unlocks the ability to create highly flexible and reusable code structures.

Knowledge Check

What is the primary purpose of a metaclass in Python?

Which of the following best describes a class decorator?

What is the key difference between using a metaclass and a class decorator for modifying class behavior?

How are class decorators typically applied in Python code?