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Django Design Patterns and Best Practices

By : Ravindran

4.7 (7)

Django Design Patterns and Best Practices

4.7 (7)

By: Ravindran

Overview of this book

If you want to learn how best to utilize commonly found patterns and learn best practices in developing applications with Django, this is the book for you. This book, like Django itself, is accessible to amateur and professional developers alike and assumes little in the way of prior experience. Although written for Python 3, the majority of the code in this book works in Python 2 or can be easily translated.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Django and Patterns

1. Django and Patterns

Why Django?

The story of Django

What is a Pattern?

Patterns in this book

Best practices

Summary

2. Application Design

2. Application Design

How to gather requirements

Are you a story teller?

HTML mockups

Designing the application

Before starting the project

SuperBook – your mission, should you choose to accept it

Summary

3. Models

3. Models

M is bigger than V and C

The model hunt

Structural patterns

Retrieval patterns

Migrations

Summary

4. Views and URLs

4. Views and URLs

A view from the top

Class-based generic views

View mixins

Decorators

View patterns

Designing URLs

Summary

5. Templates

5. Templates

Understanding Django's template language features

Organizing templates

Using Bootstrap

Template patterns

Summary

6. Admin Interface

6. Admin Interface

Using the admin interface

Enhancing models for the admin

Admin interface customizations

Protecting the admin

Summary

7. Forms

7. Forms

How forms work

Displaying forms

Understanding CSRF

Form processing with Class-based views

Form patterns

Summary

8. Dealing with Legacy Code

8. Dealing with Legacy Code

Finding the Django version

Where are the files? This is not PHP

Starting with urls.py

Jumping around the code

Understanding the code base

Incremental change or a full rewrite?

Write tests before making any changes

Legacy databases

Summary

9. Testing and Debugging

9. Testing and Debugging

Why write tests?

Test-driven development

Writing a test case

Mocking

Pattern – test fixtures and factories

Learning more about testing

Debugging

The print function

Logging

The Django Debug Toolbar

The Python debugger pdb

Other debuggers

Debugging Django templates

Summary

10. Security

10. Security

Cross-site scripting (XSS)

A handy security checklist

Summary

11. Production-ready

11. Production-ready

Production environment

Hosting

Deployment tools

Monitoring

Performance

Summary

A. Python 2 versus Python 3

A. Python 2 versus Python 3

But I still use Python 2.7!

Python 3

Further information

Index

Index

Performance

Performance is a feature. Studies show how slow sites have an adverse effect on users, and therefore, revenue. For instance, tests at Amazon in 2007 revealed that for every 100 ms increase in load time of amazon.com, the sales decreased by 1 percent.

Reassuringly, several high-performance web applications such as Disqus and Instagram have been built on Django. At Disqus, in 2013, they could handle 1.5 million concurrently connected users, 45,000 new connections per second, 165,000 messages/second, with less than 0.2 seconds latency end-to-end.

The key to improving performance is finding where the bottlenecks are. Rather than relying on guesswork, it is always recommended that you measure and profile your application to identify these performance bottlenecks. As Lord Kelvin would say:

If you can't measure it, you can't improve it.

In most web applications, the bottlenecks are likely to be at the browser or the database end rather than within Django. However, to the user...

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Programming languages

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