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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

Let's see how we can use the Builder design pattern to make a pizza ordering application. The pizza example is particularly interesting because a pizza is prepared in steps that should follow a specific order. To add the sauce, you first need to prepare the dough. To add the topping, you first need to add the sauce. And you can't start baking the pizza unless both the sauce and the topping are placed on the dough. Moreover, each pizza usually requires a different baking time, depending on the thickness of its dough and the topping used.

We start with importing the required modules and declaring a few Enum parameters [j.mp/pytenum] plus a constant that are used many times in the application. The STEP_DELAY constant is used to add a time delay between the different steps of preparing a pizza (prepare the dough, add the sauce, and so on) as follows:

from enum import Enum

PizzaProgress = Enum('PizzaProgress', 'queued preparation baking ready')
PizzaDough...

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Tech Concepts

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Programming languages

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