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Mastering Python Design Patterns

Mastering Python Design Patterns

By : Kamon Ayeva, Kasampalis
3.3 (9)
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Mastering Python Design Patterns

Mastering Python Design Patterns

3.3 (9)
By: Kamon Ayeva, 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 (23 chapters)
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Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Summary


In this chapter, we covered the Observer design pattern. We use Observer when we want to be able to inform/notify all stakeholders (an object or a group of objects) when the state of an object changes. An important feature of Observer is that the number of subscribers/observers, as well as who the subscribers are, may vary and can be changed at runtime.

To understand Observer, you can think of an auction, with the bidders being the subscribers and the auctioneer being the publisher. This pattern is used quite a lot in the software world.

As specific examples of software using Observer, we mentioned the following:

  • Kivy, the framework for developing innovative user interfaces, with its Properties concept and module.
  • The Python bindings of RabbitMQ. We referred to a specific example of RabbitMQ used to implement the publish-subscribe (also known as Observer) pattern.

In the implementation example, we saw how to use Observer to create data formatters that can be attached and detached at runtime...

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