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Mastering Python Design Patterns

By : Sakis Kasampalis

3.6 (5)

Mastering Python Design Patterns

3.6 (5)

By: Sakis Kasampalis

Overview of this book

This book is for Python programmers with an intermediate background and an interest in design patterns implemented in idiomatic Python. Programmers of other languages who are interested in Python can also benefit from this book, but it would be better if they first read some introductory materials that explain how things are done in Python.

Preface

Design patterns

Common misunderstandings about design patterns

Design patterns and Python

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. The Factory Pattern

1. The Factory Pattern

Factory Method

Abstract Factory

Summary

2. The Builder Pattern

2. The Builder Pattern

A real-life example

A software example

Use cases

Implementation

Summary

3. The Prototype Pattern

3. The Prototype Pattern

A real-life example

A software example

Use cases

Implementation

Summary

4. The Adapter Pattern

4. The Adapter Pattern

A real-life example

A software example

Use cases

Implementation

Summary

5. The Decorator Pattern

5. The Decorator Pattern

A real-life example

A software example

Use cases

Implementation

Summary

6. The Facade Pattern

6. The Facade Pattern

A real-life example

A software example

Use cases

Implementation

Summary

7. The Flyweight Pattern

7. The Flyweight Pattern

A real-life example

A software example

Use cases

Implementation

Summary

8. The Model-View-Controller Pattern

8. The Model-View-Controller Pattern

A real-life example

A software example

Use cases

Implementation

Summary

9. The Proxy Pattern

9. The Proxy Pattern

A real-life example

A software example

Use cases

Implementation

Summary

10. The Chain of Responsibility Pattern

10. The Chain of Responsibility Pattern

A real-life example

A software example

Use cases

Implementation

Summary

11. The Command Pattern

11. The Command Pattern

A real-life example

A software example

Use cases

Implementation

Summary

12. The Interpreter Pattern

12. The Interpreter Pattern

A real-life example

A software example

Use cases

Implementation

Summary

13. The Observer Pattern

13. The Observer Pattern

A real-life example

A software example

Use cases

Implementation

Summary

14. The State Pattern

14. The State Pattern

A real-life example

A software example

Use cases

Implementation

Summary

15. The Strategy Pattern

15. The Strategy Pattern

A real-life example

A software example

Use cases

Implementation

Summary

16. The Template Pattern

16. The Template Pattern

A real-life example

A software example

Use cases

Implementation

Summary

Index

Index

Implementation

There are many ways of implementing the Adapter design pattern in Python [Eckel08, page 207]. All the techniques demonstrated by Bruce Eckel use inheritance, but Python provides an alternative, and in my opinion, a more idiomatic way of implementing an Adapter. The alternative technique should be familiar to you, since it uses the internal dictionary of a class, and we have seen how to do that in Chapter 3, The Prototype Pattern.

Let's begin with the what we have part. Our application has a Computer class that shows basic information about a computer. All the classes of this example, including the Computer class are very primitive, because we want to focus on the Adapter pattern and not on how to make a class as complete as possible.

class Computer:
    def __init__(self, name):
        self.name = name

    def __str__(self):
        return 'the {} computer'.format(self.name)

    def execute(self):
        return 'executes a program'

In this case,...

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Programming languages

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