django

Django is a high-level Python Web framework that encourages rapid development, pragmatic design and follows DRY principles.

By Abhijeet ShekharBlog: http://ashekhar.wordpress.com

Features• Legacy DB• Test Framework• Multi- DB• Geodjango• Aggregation• JSON Serializer• Stable API Promise• Fantastic Docs

• Generic View• Template Inheritance• Template Filters• Humanize• Runs on Jython /Iron

Python• Google App Engine

Architecture

Component Architecture

Django is MTV/MVP framework

-Model (app/models.py-Template ( app/templates/*.html)-View (app/view.py)

Project Structure

-project= the full website app=python library

-Sample--__init__.py--settings.py--urls.py--wsgi.py-app-1--_init_.py--admin.py--models.py

--tests.py--urls.py--view.py-app-2

template/manage.pyenv/readme

Environment setup and installationStandard installation:• Content will be stored in the default location of

pythonVirtual installation:• All dependent library can be installed in the virtual

environment.• one project will be one virtualenv.• Every project with different dependencies in terms

of libraries and version.• Easier to deploy and forget dependency• Virtualenvwrapper is a convenient

Steps to create a project• Create a project• Start an application• Create your database(Mysql, Post gre)• Configure DB settings in settings.py• Define your models• Add external modules• Add your template• Write your view• Create url mappping• Test application• Deploy application (linux apache , mod

python

$ django-admin.py startproject <project_name>$ cd <project_name>$ Python manage.py startapp my$ edit settings.py and set DB info$ python manage.py runserverBrowse http://localhost:8000

Initialize Your Project

Settings:

-multiple setting files:-per environment: dev, testing, staging , Production Per developer (local settings, use the host name )

-all setting file must inherit from , so you can doINSTALLED_APPS +=(‘debug_toolbar’)-version control all the setting !

Fat models, thin viewer…

-multiple setting files:-per environment: dev, testing, staging , productionPer developer (local settings, use the host name )

-all setting file must inherit from , so you can doINSTALLED_APPS +=(‘debug_toolbar’)-version control all the setting !

Debugging

- ipython (./mange.py shell)- Ipdb- Import ipdb- Ipdb.set_trace()- django-debug-toolbar- very powerful- use it to optimze db performance, view by view

Migration

- South/migrate: - Intelligent schema & data migrations for Django- Can do backward migrations

Deployment

Web server- Niginx/Apache- wsgi- mod_python

Static server- Nginx or any CDN

Thanks