Mini Curso de Django

What's Django?

"Django is a high-level Python Web framework that encourages
rapid development and clean, pragmatic design."
from http://www.djangoproject.com/

"...and not a CMS System."

Origins...

Django Reinhardt

Origins...

Lawrence-Journal World

Origins...

Pycon 2005 - Adrian Holovaty e Simon Willison
BSD License*
Django Software Foundation - 2008

* http://en.wikipedia.org/wiki/BSD_licenses

Skills

Convention Over Configuration
Object-Relational Mapping (ORM)
Very useful admin CRUD
Form handling
Elegant URL Design
Template system
Cache system
i18n

Principles (...or philosophies)

DRY (Don't Repeat Yourself )
Loose coupling
Write less code as possible
Quick development
Explicit is better than implicit

MVC vs. MTV

Model --> Model
View --> Template
Controller --> View

Setting up...

Download
djangoproject.com/download

Install
Unzip Django-x.x.tar.gz
python setup.py install

Or... apt-get install python-django (Debian like OS)

Create a Project...

django-admin.py startproject my_project

Setup files

__init__.py - indicates a python package

manager.py - admin tasks

settings.py - project settings

urls.py - project urls map

Let's to do something...

Open settings.py:
DATABASE_ENGINE = 'sqlite3'
DATABASE_NAME = 'myblog.db'
add 'django.contrib.admin'

Open urls.py:
Uncomment the line: "from django.contrib... "
Uncomment the line: "admin.autodiscover()... "
Uncomment the line: "(r'^admin... "

Development server

python manager.py syncdb

python manager.py runserver [8000]

Others Servers...

Development Server

Apache + Mod_Python

Apache + FastCGI

Create the app

python manage.py startapp my_blog

Setup files

init.py - indicates a python package

models.py - app domain model

views.py - project controller

App x Project

App - web app that do something. E.g. XXX

Project - lot of apps and themselves settings. A project can
be a lot of apps, and a app can stay in severals projects

Create the model

Open models.py and edit:

from django.db import models

class Artigo(models.Model):
titulo = models.CharField(max_length=100)
conteudo = models.TextField()
publicacao = models.DateTimeField()

Setting the model classes to admin

Open admin.py and edit:

from django.contrib import admin
from models import Artigo

admin.site.register(Artigo)

Add the app to the admin

Open settings.py and add:
"my_project.blog"

Re-sync the database

Re-run the development server

Setting the urls

Open the urls.py and edit:

from django.conf.urls.defaults import *

# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()

from my_blog.models import Artigo

urlpatterns = patterns('',
(r'^$', 'django.views.generic.date_based.archive_index',
{'queryset': Artigo.objects.all(), 'date_field': 'publicacao'}),
(r'^admin/(.*)', admin.site.root),
)

Setting the templates

Create templates/blog/artigo_archive.html and edit:

<html><body>

<h1>Meu blog</h1>

{% for artigo in latest %}
<h2>{{ artigo.titulo }}</h2>

{{ artigo.conteudo }}
{% endfor %}

</body></html>

Look your app!

http://localhost:8000/

Recap...

Django is easy
Django is fun
Django scales
Django is maintainable
Django saves small kittens
It rocks - USE IT!

Sites powered by Python/Django

Contact/follow us...

leofernandesmo@gmail.com
felipe.buarque@gmail.com

Twitter:
@leofernandesmo
@felipe_wally

Mini Curso de Django

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