Book Image

Mastering Python Design Patterns - Second Edition

By : Kamon Ayeva, Sakis Kasampalis
Book Image

Mastering Python Design Patterns - Second Edition

By: Kamon Ayeva, Sakis Kasampalis

Overview of this book

Python is an object-oriented scripting language that is used in a wide range of categories. In software engineering, a design pattern is an elected solution for solving software design problems. Although they have been around for a while, design patterns remain one of the top topics in software engineering, and are a ready source for software developers to solve the problems they face on a regular basis. This book takes you through a variety of design patterns and explains them with real-world examples. You will get to grips with low-level details and concepts that show you how to write Python code, without focusing on common solutions as enabled in Java and C++. You'll also fnd sections on corrections, best practices, system architecture, and its designing aspects. This book will help you learn the core concepts of design patterns and the way they can be used to resolve software design problems. You'll focus on most of the Gang of Four (GoF) design patterns, which are used to solve everyday problems, and take your skills to the next level with reactive and functional patterns that help you build resilient, scalable, and robust applications. By the end of the book, you'll be able to effciently address commonly faced problems and develop applications, and also be comfortable working on scalable and maintainable projects of any size.
Table of Contents (17 chapters)

The Observer Pattern in Reactive Programming

In the previous chapter, we covered the last four in our list of behavioral patterns. That chapter also marked the end of the list of patterns presented by the Gang of Four in their book.

Among the patterns we have discussed so far, one is particularly interesting now, for this new chapter: the Observer pattern (covered in Chapter 11, The Observer Pattern), is useful for notifying an object or a group of objects when the state of a given object changes. This type of traditional Observer applies the publish-subscribe principle, allowing us to react to some object change events. It provides a nice solution for many cases, but in a situation where we have to deal with many events, some of them depending on each other, the traditional way could lead to complicated, difficult-to-maintain code. That is where another paradigm called reactive...