Summary

In this chapter, we went into detail on several more design patterns, covering their canonical descriptions as well as alternatives for implementing them in Python, which is often more flexible and versatile than traditional object-oriented languages. The Adapter pattern is useful for matching interfaces, while the Façade pattern is suited to simplifying them. Flyweight is a complicated pattern and only useful if memory optimization is required. Abstract Factories allow the runtime separation of implementations depending on configuration or system information. The Composite pattern is used universally for tree-like structures. A Template method can be helpful for breaking complex operations into steps to avoid repeating the common features.

This is the last of the truly object-oriented design chapters in this book. In the next two chapters, we'll discuss how important it is to test Python programs, and how to do it, focusing on object-oriented principles. Then...