Summary

Recall

The world of software design is full of good ideas. The really good ideas get repeated and form repeatable patterns. Knowing—and using—these patterns of software design can save the developer from burning a lot of brain calories trying to reinvent something that’s been developed already. In this chapter, we looked at a few of the most common patterns:

• The Decorator pattern is used in the Python language to add features to functions or classes. We can define decorator functions and apply them directly, or use the @ syntax to apply a decorator to another function.

• The Observer pattern can ...