Django, What is it, Why is it cool?

Django, What is it, Why is it cool? 'Cause it is built on Python and has Pinax on top, and they are all Open Source http://oswco.com

Why do I care?
Open Source
Low cost
Platform Agnostic
No vendor lock in
High Performance
Modern architecture
Standards Compliant
Highly Modular
Widely supported
Internationalization support LtR language support
http://oswco.com

Django Is a Python Framework Not just a Web framework What is Python? http://oswco.com

Traditional Approach vs. Django
Build Data Dictionary
Build Data Base Interface
Build Authoring Tools
Build Logic
Paint Templates
Build Data Flow
Done Done Done Done Done Done Traditional Model Django http://oswco.com

Python
An Interpreted Language with extensive corporate usage and sponsorship
Inherently Multiplatform Linux, Windows, Mac (some others)
Inherently Multi Language (multi character support also)
Many "packages" covering a wide variety of domains
Math : scipy
Image Recognition
Corporate sponsorship:
Google
Microsoft (Iron Python)
Sun (Jython)
http://oswco.com

Django
Lots of users:
Google
NASA
PBS
Bit-Bucket
Newspapers
http://oswco.com

Django as a framework
An MVC type framework (Called MVT in Django)
M= Model, The database interface
V= View, Logic for getting stuff in and out of the database
T= Template, The display logic
Closest competitor is Ruby on Rails Microsoft playing catch up in MVC frameworks still almost Beta Java examples are Grails, Spring, Struts or Java Server Faces PHP has dozens Symfony, CodeIgniter

For the Web MVT (or MVC) is as important a concept as "Structured Programming" and dates back to 1979.

Enables easier maintenance and independent development of functional modules with different skill sets
http://oswco.com

Django layers (MVT)
Model ..View...Template
Model
Database interface an abstraction
Supports:
Mysql
MSsql
Oracle
Postgre Sql
IBM Db2
Sql lite
In general: change the DataBase and don't touch your code
Define model, Admin gets generated automatically
So does the database
Most data editing
http://oswco.com

Django View
Most Business logic
edits, calculations
permissions
many libraries available
Context processors:
More advanced business logic
http://oswco.com

Template
Simple template language
Css is separate
designed for non technical users such as designers
Easily able to use other Template models (Jinga)
Can be used with most advanced front end tools:
Ajax
Jquery
Pyjamas (an upcoming Python Web Presentation tool)
Flash
Adobe Air
http://oswco.com

Other Django features
Unique in being built on standard language and able to take advantage of libraries developed for other purposes, Imaging, graphics, scientific calculations and many more.
Extensive configuration file
Different Databases
Different sites
Different operating systems
Different Caching frameworks
Structure allows site optimization across specialized servers
Static media
Media
And now also Pinax which is a collection of pre-configured applications written in Django
http://oswco.com

Other Django features continued
Loosely coupled
Alternative Model layer, Sql Alchemy
Alternative Template layer, Jinga, Jinga2
Many users constantly adding modules and features
http://oswco.com

Pinax
Pre-assembled Django Applications
Permissions
Blog
Social site
Project site
Sales site
http://oswco.com

Tools
Python
Python Debug tools
Django debug toolbar
Eclipse Pydev
Pylint
Pytest Doc test Unit test
Embedded documentation via Sphinx
Change control done with Distributed change control tool GIT (used by the Linux development team)
http://oswco.com

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Django, What is it, Why is it cool?

by Tom Brander on Oct 28, 2009

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Django, What is it, Why is it cool? — Presentation Transcript