Book Image

Learning Python Design Patterns - Second Edition - Second Edition

By : Chetan Giridhar, Gennadiy Zlobin
Book Image

Learning Python Design Patterns - Second Edition - Second Edition

By: Chetan Giridhar, Gennadiy Zlobin

Overview of this book

With the increasing focus on optimized software architecture and design it is important that software architects think about optimizations in object creation, code structure, and interaction between objects at the architecture or design level. This makes sure that the cost of software maintenance is low and code can be easily reused or is adaptable to change. The key to this is reusability and low maintenance in design patterns. Building on the success of the previous edition, Learning Python Design Patterns, Second Edition will help you implement real-world scenarios with Python’s latest release, Python v3.5. We start by introducing design patterns from the Python perspective. As you progress through the book, you will learn about Singleton patterns, Factory patterns, and Façade patterns in detail. After this, we’ll look at how to control object access with proxy patterns. It also covers observer patterns, command patterns, and compound patterns. By the end of the book, you will have enhanced your professional abilities in software architecture, design, and development.
Table of Contents (19 chapters)
Learning Python Design Patterns Second Edition
Credits
Foreword
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

The Simple Factory pattern


For some, Simple Factory is not a pattern in itself. It is more of a concept that developers need to know before they know more about the Factory method and Abstract Factory method. The Factory helps create objects of different types rather than direct object instantiation.

Let's understand this with the help of the following diagram. Here, the client class uses the Factory class, which has the create_type() method. When the client calls the create_type() method with the type parameters, based on the parameters passed, the Factory returns Product1 or Product2:

A UML Diagram of Simple Factory

Let's now understand the Simple Factory pattern with the help of a Python v3.5 code example. In the following snippet, we create an Abstract product called Animal. Animal is an abstract base class (ABCMeta is Python's special metaclass to make a class Abstract) and has the do_say() method. We create two products (Cat and Dog) from the Animal interface and implement do_say() with...