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.

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

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 = ???

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)

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/

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

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

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:

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:

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:

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

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

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

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]

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/

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!

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!