June 2019
Beginner to intermediate
770 pages
19h 24m
English
Content preview from Mastering Object-Oriented Python - Second Edition
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Building features through inheritance and composition
As noted earlier in the Liskov Substitution Principle section, there are two general ways to add features to a class definition:
- Inheritance to extend a class by creating a subclass
- Composition of a new class from one or more other classes
In general, these choices are always present. Every object-oriented design decision involves choosing between inheritance and composition.
To make the decision more nuanced, Python allows multiple inheritance. While combining multiple mixing classes is partially a kind of inheritance, it is more fundamentally an exercise in composition.
The LSP can lead to avoiding inheritance in favor of composition. The general suggestion is to reserve inheritance ...
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