More Advanced Class Design
In Chapter 7, Basics of Classes and Objects, we looked at some recipes that covered the basics of class design. In this chapter, we'll dive more deeply into Python classes.
In the Designing classes with lots of processing and Using properties for lazy attributes recipes in Chapter 7, Basics of Classes and Objects, we identified a design choice that's central to object-oriented programming, the "wrap versus extend" decision. One way to add features is to create a new subclass via an extension. The other technique for adding features is to wrap an existing class, making it part of a new class.
In addition to direct inheritance, there are some other class extension techniques available in Python. A Python class can inherit features from more than one superclass. We call this design pattern a mixin.
In Chapter 4, Built-In Data Structures Part 1: Lists and Sets, and Chapter 5, Built-In Data Structures Part 2: Dictionaries...
