Chapter 7. The Command Pattern – Encapsulating Invocation

In the previous chapter, we started with an introduction to behavioral design patterns. You learned the concept of Observers and discussed the Observer design pattern. We understood the concept of the Observer design pattern with a UML diagram and also learned how it's applied in the real world with the help of Python implementations. We discussed the pros and cons of the Observer pattern. You also learned about the Observer pattern with an FAQ section and summarized the discussion at the end of the chapter.

In this chapter, we will talk about the Command design pattern. Like the Observer pattern, the Command pattern falls under the hood of Behavioral patterns. We will get introduced to the Command design pattern and discuss how it is used in software application development. We will work with a sample use case and implement it in Python v3.5.

In this chapter, we will cover the following topics in brief:

• An introduction...