Search icon Close icon
Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases now! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.

Change country

Modal Close icon
Country selected Country selected
country flag United States
Country selected
country flag United Kingdom
Country selected
country flag India
Country selected
country flag Germany
Country selected
country flag France
Country selected
country flag Canada
Country selected
country flag Russia
Country selected
country flag Spain
Country selected
country flag Brazil
Country selected
country flag Australia
Country selected
country flag Argentina
Country selected
country flag Austria
Country selected
country flag Belgium
Country selected
country flag Bulgaria
Country selected
country flag Chile
Country selected
country flag Colombia
Country selected
country flag Cyprus
Country selected
country flag Czechia
Country selected
country flag Denmark
Country selected
country flag Ecuador
Country selected
country flag Egypt
Country selected
country flag Estonia
Country selected
country flag Finland
Country selected
country flag Greece
Country selected
country flag Hungary
Country selected
country flag Indonesia
Country selected
country flag Ireland
Country selected
country flag Italy
Country selected
country flag Japan
Country selected
country flag Latvia
Country selected
country flag Lithuania
Country selected
country flag Luxembourg
Country selected
country flag Malaysia
Country selected
country flag Malta
Country selected
country flag Mexico
Country selected
country flag Netherlands
Country selected
country flag New Zealand
Country selected
country flag Norway
Country selected
country flag Philippines
Country selected
country flag Poland
Country selected
country flag Portugal
Country selected
country flag Romania
Country selected
country flag Singapore
Country selected
country flag Slovakia
Country selected
country flag Slovenia
Country selected
country flag South Africa
Country selected
country flag South Korea
Country selected
country flag Sweden
Country selected
country flag Switzerland
Country selected
country flag Taiwan
Country selected
country flag Thailand
Country selected
country flag Turkey
Country selected
country flag Ukraine
Country selected
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Home > Programming > Design Patterns > Mastering Python Design Patterns
Mastering Python Design Patterns
Mastering Python Design Patterns

Mastering Python Design Patterns: Start learning Python programming to a better standard by mastering the art of Python design patterns

Arrow left icon
Profile Icon Kasampalis
Arrow right icon
€29.99
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.6 (5 Ratings)
eBook Jan 2015 212 pages 1st Edition
eBook
€29.99
Paperback
€36.99
Subscription
Free Trial
Renews at €18.99p/m
Arrow left icon
Profile Icon Kasampalis
Arrow right icon
€29.99
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.6 (5 Ratings)
eBook Jan 2015 212 pages 1st Edition
eBook
€29.99
Paperback
€36.99
Subscription
Free Trial
Renews at €18.99p/m
eBook
€29.99
Paperback
€36.99
Subscription
Free Trial
Renews at €18.99p/m

What do you get with eBook?

Product feature icon Instant access to your Digital eBook purchase
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Table of content icon View table of contents Preview book icon Preview Book

Mastering Python Design Patterns

Chapter 2. The Builder Pattern

Imagine that we want to create an object that is composed of multiple parts and the composition needs to be done step by step. The object is not complete unless all its parts are fully created. That's where the Builder design pattern can help us. The Builder pattern separates the construction of a complex object from its representation. By keeping the construction separate from the representation, the same construction can be used to create several different representations [GOF95, page 110], [j.mp/builderpat].

A practical example can help us understand what the purpose of the Builder pattern is. Suppose that we want to create an HTML page generator, the basic structure (construction part) of an HTML page is always the same: it begins with <html> and finishes with </html>; inside the HTML section are the <head> and </head> elements, inside the head section are the <title> and </title> elements, and so forth...

A real-life example

The Builder design pattern is used in fast-food restaurants. The same procedure is always used to prepare a burger and the packaging (box and paper bag), even if there are many different kinds of burgers (classic, cheeseburger, and more) and different packages (small-sized box, medium-sized box, and so forth). The difference between a classic burger and a cheeseburger is in the representation, and not in the construction procedure. The director is the cashier who gives instructions about what needs to be prepared to the crew, and the builder is the person from the crew that takes care of the specific order. The following figure provided by www.sourcemaking.com shows a Unified Modeling Language (UML) sequence diagram of the communication that takes place between the customer (client), the cashier (director), and the crew (builder) when a kid's menu is ordered [j.mp/builderpat].

A real-life example

A software example

The HTML example that was mentioned at the beginning of the chapter is actually used by django-widgy, a third-party tree editor for Django that can be used as a Content Management System (CMS). The django-widgy editor contains a page builder that can be used for creating HTML pages with different layouts [j.mp/widgypb].

The django-query-builder library is another third-party Django library that relies on the Builder pattern. The django-query-builder library can be used for building SQL queries dynamically. Using this, we can control all aspects of a query and create a different range of queries, from simple to very complex [j.mp/djangowidgy].

Use cases

We use the Builder pattern when we know that an object must be created in multiple steps, and different representations of the same construction are required. These requirements exist in many applications such as page generators (like the HTML page generator mentioned in this chapter), document converters [GOF95, page 110], and User Interface (UI) form creators [j.mp/pipbuild].

Some resources mention that the Builder pattern can also be used as a solution to the telescopic constructor problem [j.mp/wikibuilder]. The telescopic constructor problem occurs when we are forced to create a new constructor for supporting different ways of creating an object. The problem is that we end up with many constructors and long parameter lists, which are hard to manage. An example of the telescopic constructor is listed at the stackoverflow website [j.mp/sobuilder]. Fortunately, this problem does not exist in Python, because it can be solved in at least two ways:

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...

Summary

In this chapter, we have seen how to use the Builder design pattern. We use the Builder pattern for creating an object in situations where using the Factory pattern (either a Factory Method or an Abstract Factory) is not a good option. A Builder pattern is usually a better candidate than a Factory pattern when:

  • We want to create a complex object (an object composed of many parts and created in different steps that might need to follow a specific order).
  • Different representations of an object are required, and we want to keep the construction of an object decoupled from its representation
  • We want to create an object at one point in time but access it at a later point

We saw how the Builder pattern is used in fast-food restaurants for preparing meals, and how two third-party Django packages, django-widgy and django-query-builder, use it for generating HTML pages and dynamic SQL queries, respectively. We focused on the differences between a Builder pattern and a Factory pattern, and gave...

Left arrow icon

Page 1 of 6

Right arrow icon

Description

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.

Who is this book for?

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.

What you will learn

  • Explore Factory Method and Abstract Factory for object creation
  • Clone objects using the Prototype pattern
  • Make incompatible interfaces compatible using the Adapter pattern
  • Secure an interface using the Proxy pattern
  • Choose an algorithm dynamically using the Strategy pattern
  • Extend an object without subclassing using the Decorator pattern
  • Keep the logic decoupled from the UI using the MVC pattern

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Jan 28, 2015
Length: 212 pages
Edition : 1st
Language : English
ISBN-13 : 9781783989331
Category :
Programming
Languages :
Python
Concepts :
Design Patterns

What do you get with eBook?

Product feature icon Instant access to your Digital eBook purchase
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want

Product Details

Publication date : Jan 28, 2015
Length: 212 pages
Edition : 1st
Language : English
ISBN-13 : 9781783989331
Category :
Programming
Languages :
Python
Concepts :
Design Patterns

Packt Subscriptions

See our plans and pricing
Modal Close icon
€18.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
START FREE TRIAL
BUY NOW
€189.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts
START FREE TRIAL
BUY NOW
€264.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts
START FREE TRIAL
BUY NOW

Frequently bought together

Python 3 Object-Oriented Programming - Second Edition
Python 3 Object-Oriented Programming - Second Edition
Read more
Aug 2015 460 pages
Full star icon 3.9 (36)
eBook
eBook
  • eBook eBook €32.99
  • Paperback Paperback €41.99
€32.99
€41.99
Functional Python Programming
Functional Python Programming
Read more
Jan 2015 360 pages
Full star icon 4 (9)
eBook
eBook
  • eBook eBook €32.99
  • Paperback Paperback €41.99
€32.99
€41.99
Mastering Python Design Patterns
Mastering Python Design Patterns
Read more
Jan 2015 212 pages
Full star icon 3.6 (5)
eBook
eBook
  • eBook eBook €29.99
  • Paperback Paperback €36.99
€29.99
€36.99
Stars icon
Total € 120.97
Python 3 Object-Oriented Programming - Second Edition
€41.99
Functional Python Programming
€41.99
Mastering Python Design Patterns
€36.99
Total € 120.97 Stars icon

Table of Contents

17 Chapters
1. The Factory Pattern Chevron down icon Chevron up icon
1. The Factory Pattern
Factory Method
Abstract Factory
Summary
2. The Builder Pattern Chevron down icon Chevron up icon
2. The Builder Pattern
A real-life example
A software example
Use cases
Implementation
Summary
3. The Prototype Pattern Chevron down icon Chevron up icon
3. The Prototype Pattern
A real-life example
A software example
Use cases
Implementation
Summary
4. The Adapter Pattern Chevron down icon Chevron up icon
4. The Adapter Pattern
A real-life example
A software example
Use cases
Implementation
Summary
5. The Decorator Pattern Chevron down icon Chevron up icon
5. The Decorator Pattern
A real-life example
A software example
Use cases
Implementation
Summary
6. The Facade Pattern Chevron down icon Chevron up icon
6. The Facade Pattern
A real-life example
A software example
Use cases
Implementation
Summary
7. The Flyweight Pattern Chevron down icon Chevron up icon
7. The Flyweight Pattern
A real-life example
A software example
Use cases
Implementation
Summary
8. The Model-View-Controller Pattern Chevron down icon Chevron up icon
8. The Model-View-Controller Pattern
A real-life example
A software example
Use cases
Implementation
Summary
9. The Proxy Pattern Chevron down icon Chevron up icon
9. The Proxy Pattern
A real-life example
A software example
Use cases
Implementation
Summary
10. The Chain of Responsibility Pattern Chevron down icon Chevron up icon
10. The Chain of Responsibility Pattern
A real-life example
A software example
Use cases
Implementation
Summary
11. The Command Pattern Chevron down icon Chevron up icon
11. The Command Pattern
A real-life example
A software example
Use cases
Implementation
Summary
12. The Interpreter Pattern Chevron down icon Chevron up icon
12. The Interpreter Pattern
A real-life example
A software example
Use cases
Implementation
Summary
13. The Observer Pattern Chevron down icon Chevron up icon
13. The Observer Pattern
A real-life example
A software example
Use cases
Implementation
Summary
14. The State Pattern Chevron down icon Chevron up icon
14. The State Pattern
A real-life example
A software example
Use cases
Implementation
Summary
15. The Strategy Pattern Chevron down icon Chevron up icon
15. The Strategy Pattern
A real-life example
A software example
Use cases
Implementation
Summary
16. The Template Pattern Chevron down icon Chevron up icon
16. The Template Pattern
A real-life example
A software example
Use cases
Implementation
Summary
Index Chevron down icon Chevron up icon
Index

Recommendations for you

Left arrow icon
Composing Software
Composing Software
Read more
Sep 2024 238 pages
eBook
eBook
  • eBook eBook €25.99
€25.99
Bare-Metal Embedded C Programming
Bare-Metal Embedded C Programming
Read more
Sep 2024 438 pages
eBook
eBook
  • eBook eBook €25.99
  • Paperback Paperback €31.99
€25.99
€31.99
TradeStation EasyLanguage for Algorithmic Trading
TradeStation EasyLanguage for Algorithmic Trading
Read more
Sep 2024 282 pages
eBook
eBook
  • eBook eBook €23.99
  • Paperback Paperback €29.99
€23.99
€29.99
Technical Program Manager's Handbook
Technical Program Manager's Handbook
Read more
Sep 2024 368 pages
Full star icon 5 (3)
eBook
eBook
  • eBook eBook €25.99
  • Paperback Paperback €31.99
€25.99
€31.99
Everyday data structures
Everyday data structures
Read more
Mar 2017 344 pages
eBook
eBook
  • eBook eBook €29.99
  • Paperback Paperback €36.99
€29.99
€36.99
ChatGPT and Prompt Engineering for Software Development
ChatGPT and Prompt Engineering for Software Development
Read more
Jul 2023 4hrs 23mins
Video
Video
  • Video Video €41.99
€41.99
Learn Java 17 Programming
Learn Java 17 Programming
Read more
Jul 2022 748 pages
Full star icon 3.3 (12)
eBook
eBook
  • eBook eBook €26.99
  • Paperback Paperback €33.99
€26.99
€33.99
Learn Python Programming
Learn Python Programming
Read more
Jun 2018 508 pages
Full star icon 4.1 (28)
eBook
eBook
  • eBook eBook €27.99
  • Paperback Paperback €34.99
€27.99
€34.99
Software Architecture Patterns for Serverless Systems
Software Architecture Patterns for Serverless Systems
Read more
Feb 2024 488 pages
Full star icon 5 (15)
eBook
eBook
  • eBook eBook €34.99
  • Paperback Paperback €43.99
€34.99
€43.99
Mastering Python Design Patterns
Mastering Python Design Patterns
Read more
May 2024 296 pages
Full star icon 4.5 (6)
eBook
eBook
  • eBook eBook €23.99
  • Paperback Paperback €29.99
€23.99
€29.99
Right arrow icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.6
(5 Ratings)
5 star 20%
4 star 60%
3 star 0%
2 star 0%
1 star 20%
Richard Hazey Mar 04, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book is well organized and concisely written. Each chapter stands on its own and can be read independently, which fits my style and allows for reading it as time permits. The chapters each contain some theory or explanation as well as copious amounts of code and real world examples. The use cases were also helpful in understanding situations where the design patterns could be implemented.I purchased the eBook version which had links embedded in the text for additional detail and in-depth explanations on related topics. I like to explore as I read and learn, so this was a welcome feature.The only con for me was that it's written for Python 3, however, the concepts apply to Python 2 and other languages. Eventually I will move to Python 3 and this was a gave me a chance to try Python 3.I recommend if you want to learn about design patterns and you're a Python user.
Amazon Verified review Amazon
Matteo Mar 01, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
If you need to find new ideas on how to optimize or make your code more easy to interpret this book will give you several examples of code structures to make it more efficient or more simple to interpret. The book writing style is a bit dry and it's not for beginners(you need to know what python is about and how to code with it or you will get lost) but the core content is sound so if you know your stuff and you want to learn new coding styles this book is for you.
Amazon Verified review Amazon
GEORGE G Mar 22, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
I really enjoy reading this book. It was very useful to learn how to properly apply certain design patterns to real-life examples.
Amazon Verified review Amazon
Arto Mujunen Sep 14, 2019
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Straight forward explanations for each design patterns without academic jargon
Amazon Verified review Amazon
vytas315 Jul 30, 2016
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
There is simple and then there is simplistic. The examples in this book may be structured in the style of the design patterns discussed, but they lack the complexity to truly communicate the purpose of these patterns. If you need general ideas about patterns, this book is fine. However, I'm finding myself googling every section to learn more practical information about when and why to use these patterns. This book is very light on content and does nothing to convey deeper understanding of when certain principles should be used. I encourage you to google each chapter title rather than buying this book.
Amazon Verified review Amazon

People who bought this also bought

Left arrow icon
Domain-Driven Design with Golang
Domain-Driven Design with Golang
Read more
Dec 2022 204 pages
Full star icon 4.4 (19)
eBook
eBook
  • eBook eBook €26.99
  • Paperback Paperback €33.99
€26.99
€33.99
Template Metaprogramming with C++
Template Metaprogramming with C++
Read more
Aug 2022 480 pages
Full star icon 4.6 (14)
eBook
eBook
  • eBook eBook €28.99
  • Paperback Paperback €35.99
€28.99
€35.99
The Python Workshop Second Edition
The Python Workshop Second Edition
Read more
Nov 2022 600 pages
Full star icon 4.6 (21)
eBook
eBook
  • eBook eBook €31.99
  • Paperback Paperback €38.99
€31.99
€38.99
Event-Driven Architecture in Golang
Event-Driven Architecture in Golang
Read more
Nov 2022 384 pages
Full star icon 4.9 (11)
eBook
eBook
  • eBook eBook €29.99
  • Paperback Paperback €37.99
€29.99
€37.99
50 Algorithms Every Programmer Should Know
50 Algorithms Every Programmer Should Know
Read more
Sep 2023 538 pages
Full star icon 4.5 (67)
eBook
eBook
  • eBook eBook €29.99
  • Paperback Paperback €37.99
€29.99
€37.99
Right arrow icon

About the author

Profile icon Kasampalis
Kasampalis
Sakis Kasampalis is a software architect living in the Netherlands. He is not dogmatic about particular programming languages and tools; his principle is that the right tool should be used for the right job. One of his favorite tools is Python because he finds it very productive. Sakis was also the technical reviewer of Mastering Object-oriented Python and Learning Python Design Patterns, published by Packt Publishing.
Read more
See other products by Kasampalis
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

How do I buy and download an eBook? Chevron down icon Chevron up icon

Where there is an eBook version of a title available, you can buy it from the book details for that title. Add either the standalone eBook or the eBook and print book bundle to your shopping cart. Your eBook will show in your cart as a product on its own. After completing checkout and payment in the normal way, you will receive your receipt on the screen containing a link to a personalised PDF download file. This link will remain active for 30 days. You can download backup copies of the file by logging in to your account at any time.

If you already have Adobe reader installed, then clicking on the link will download and open the PDF file directly. If you don't, then save the PDF file on your machine and download the Reader to view it.

Please Note: Packt eBooks are non-returnable and non-refundable.

Packt eBook and Licensing When you buy an eBook from Packt Publishing, completing your purchase means you accept the terms of our licence agreement. Please read the full text of the agreement. In it we have tried to balance the need for the ebook to be usable for you the reader with our needs to protect the rights of us as Publishers and of our authors. In summary, the agreement says:

  • You may make copies of your eBook for your own use onto any machine
  • You may not pass copies of the eBook on to anyone else
How can I make a purchase on your website? Chevron down icon Chevron up icon

If you want to purchase a video course, eBook or Bundle (Print+eBook) please follow below steps:

  1. Register on our website using your email address and the password.
  2. Search for the title by name or ISBN using the search option.
  3. Select the title you want to purchase.
  4. Choose the format you wish to purchase the title in; if you order the Print Book, you get a free eBook copy of the same title. 
  5. Proceed with the checkout process (payment to be made using Credit Card, Debit Cart, or PayPal)
Where can I access support around an eBook? Chevron down icon Chevron up icon
  • If you experience a problem with using or installing Adobe Reader, the contact Adobe directly.
  • To view the errata for the book, see www.packtpub.com/support and view the pages for the title you have.
  • To view your account details or to download a new copy of the book go to www.packtpub.com/account
  • To contact us directly if a problem is not resolved, use www.packtpub.com/contact-us
What eBook formats do Packt support? Chevron down icon Chevron up icon

Our eBooks are currently available in a variety of formats such as PDF and ePubs. In the future, this may well change with trends and development in technology, but please note that our PDFs are not Adobe eBook Reader format, which has greater restrictions on security.

You will need to use Adobe Reader v9 or later in order to read Packt's PDF eBooks.

What are the benefits of eBooks? Chevron down icon Chevron up icon
  • You can get the information you need immediately
  • You can easily take them with you on a laptop
  • You can download them an unlimited number of times
  • You can print them out
  • They are copy-paste enabled
  • They are searchable
  • There is no password protection
  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.