January 2015
Intermediate to advanced
212 pages
4h 22m
English
Content preview from Mastering Python Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 5. The Decorator Pattern
Whenever we want to add extra functionality to an object, we have a number of different options. We can:
- Add the functionality directly to the class the object belongs to, if it makes sense (for example, add a new method)
- Use composition
- Use inheritance
Composition should generally be preferred over inheritance, because inheritance makes code reuse harder, it's static, and applies to an entire class and all instances of it [GOF95, page 31], [j.mp/decopat].
Design patterns offer us a fourth option that supports extending the functionality of an object dynamically (in runtime): Decorators. A Decorator pattern can add responsibilities to an object dynamically, and in a transparent manner (without affecting other objects) ...
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