Web Development in Django

Web Development, The Django Way! - An Introduction Presented at Barcamp Bangalore 8 Lakshman Prasad Usware Technologies Pvt Ltd

Building a Django web app.
What is Django.
Why Django?
Who uses Django
Tutorial. Go, Hack!
About Usware

What is Django
Python web framework
Enables Agile Web Development
Focus on programmer productivity
Recently hit 1.0
Influenced Google's App Engine Framework
For perfectionists with deadlines

Why Django
1995 – Static web pages - Html
2000 – Some Dynamic components – SSI
2005 – Dynamic database driven web PAGES – PHP -- C#, J2EE in enterprise
2009 – Dynamic Web apps, agility, time to market = ???

Why Django
The web is evolving
Web apps are getting complex
Ad-hoc solutions like PHP wont do
Java, .net are time consuming, 'entrprisy'.
New ways evolve
'Python makes Programmers HAPPY' :)
http://www.paulgraham.com/gh.html
Your best bet is Django. (Or Rails)

Who uses Django
Google
WashingtonPost
WashingtonTimes
lawrence.com
Mahalo Answers
uswaretech.com :)
...
Full List: http://www.djangosites.org/

Tutorial
How Django processes urls
You request – yoursite.com/page/
urls.py decides which view function to call
views.py decides which models to acess and manipulate. It renders the template.
What you need to write – urls.py, views.py, models.py, template.html

Awesome features of Django
Automatic admin interface – Full crud operations – Its not scaffolding, its the whole house
Convention over configuration is achieved by inferring, not auto generating
Plays well with other components
Can be deployed on a JVM

Tutorial - models.py
Defines your datamodel
Do not need to write all functions – Django infers them, Declarative programming
Sample code:

Tutorial - urls.py
Built with regularexpressions
Maps url patterns to functions
Sample code:

Tutorial - views.py
Handles requests
Normal function – Takes a request input, returns RESPONSE object output.
Sample code:

template.html
For each different type of page one template
Just html, with a little markup for dynamic content
Built for designers – seperation of concerns
Sample code

Tools – xkcd.com/378

Tools
Ipython console
easy_install
Wing IDE , Komodo IDE, PyDev, 20 more..
http://stackoverflow.com/questions/81584/what-ide-to-use-for-python/495355

Reusable Development
http://uswaretech.com/blog/2008/11/building-reusable-django-apps/
Import from the app level, not project level
Use named url patterns in urls.py
Dont Hardcode urls, in views – Ever.
Use reverse() function to get url patterns
Use {{ url }} tags in templates for <a href='' ''>
Templates and statics from 'appname'/ folder

Resources
Python: Stephen Holden: Learn python in 3 hours. Dive into Python http://diveintopython.org
Django: http://docs.django.com/ http://djangobook.com/
IRC: #Django #Python on freenode
StackOverflow: http://stackoverflow.com/questions/tagged/python
Django vs ROR http://news.ycombinator.com/item?id=195423
Mailing List: [email_address]

More Resources
http://42topics.com/blog/category/django/
Interviews of django creators, President, release manager, and of people moved from .net, ROR
http://uswaretech.com/blog
Using django with twitter, facebook, paypal, amazon s3, ...
http://svn.uswaretech.com/
Open Source django apps: A wiki, A blog, A todo list, Jobs, Time tracker, ...
http://uswaretech.com/blog/2008/11/building-reusable-django-apps/

About Usware
Build web applications with Django (& Jquery)
Small team of Hackers, Experts in django
Clients include django development agencies in US, Australia, Europe. http://uswaretech.com/projects/
'Building amazing web apps'
Based in Hyderabad, India
Say me a 'Hi', anytime: [email_address]
Go, HACK!

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Web Development in Django

by Lakshman Prasad

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