Python: Master the Art of Design Patterns

Summary

In this chapter, we have seen how to use the Factory Method and the Abstract Factory design patterns. Both patterns are used when we want to (a) track an object creation, (b) decouple an object creation from an object usage, or even (c) improve the performance and resource usage of an application. Case (c) was not demonstrated in the chapter. You might consider it as a good exercise.

The Factory Method design pattern is implemented as a single function that doesn't belong to any class, and is responsible for the creation of a single kind of object (a shape, a connection point, and so on). We saw how the Factory Method relates to toy construction, mentioned how it is used by Django for creating different form fields, and discussed other ...