Download pdf - Django: Schnell performante Web-Applikationen entwicklen

Schnell performanteWeb-Applikationen entwickeln

Markus Zapke-GründemannLinuxTag 2012

Übersicht• Vorstellung

• Was ist Django?

• Architektur

• Code

• Django Roadmap

• Entwicklungsprozess

• Django in Zahlen

• Django in freier Wildbahn

• Nützliche Django Apps

MarkusZapke-Gründemann

• Softwareentwickler seit 2001

• Softwareentwicklung mit Python, Django und Mercurial

• Selbstständig seit 2008

• Seit 2011 Geschäftsführer bei Inqbus

Was ist Django?

Bildquelle: http://en.wikipedia.org/wiki/File:Django_Reinhardt_%28Gottlieb_07301%29.jpg

Django Reinhardt* 23.1.1910✝ 16.5.1953

Was ist Django?

• Web Application Framework

• In Python geschrieben

• Open Source Software (BSD Lizenz)

• Django Software Foundation

• Umfangreiche Dokumentation

• Große, freundliche Community

Was ist Django?

• Rapid Development

• Loose Coupling

• Wiederverwendbare Applikationen

• Don't Repeat Yourself (DRY)

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

http://c2.com/cgi/wiki?DontRepeatYourself

www.djangoproject.com

Und natürlich Ponies!

Ponies?

Ponies?

Architektur

MTV

Webserver

Webserver

Webserver

URLConf

Webserver

URLConf Middleware

Webserver

URLConf Middleware

View

Webserver

URLConf Middleware

View

Webserver

URLConf Middleware

View

Webserver

Model (ORM)

URLConf Middleware

View

Webserver

Model (ORM)

URLConf Middleware

View

Webserver

Datenbank

Model (ORM)

URLConf Middleware

View

Webserver

Datenbank

Model (ORM)

URLConf Middleware

View

Webserver

Datenbank

Model (ORM)

URLConf Middleware

View

Webserver

Datenbank

Model (ORM)

URLConf Middleware

View

Webserver

Datenbank

TemplateModel (ORM)

URLConf Middleware

View

Webserver

Datenbank

TemplateModel (ORM)

URLConf Middleware

View

Webserver

Datenbank

TemplateModel (ORM)

URLConf

Tags & Filter

Middleware

View

Webserver

Datenbank

TemplateModel (ORM)

URLConf

Tags & Filter

Middleware

View

Webserver

Datenbank

TemplateModel (ORM)

URLConf

Tags & Filter

Middleware

View

Webserver

Datenbank

TemplateModel (ORM)

URLConf

Tags & Filter

Middleware

Object Relational Mapper


Admin


Admin

URLConf


Admin

URLConf

Views


Admin

URLConf

Views

Templates (Tags & Filter)


Admin

URLConf

Views


Sessions


Admin

URLConf

Views


Sessions

Serializer (JSON, XML, YAML)


Admin

URLConf

Views


Sessions


Syndication (RSS, Atom)


Admin

URLConf

Views


Sessions



GeoDjango (GIS)


Admin

URLConf

Views


Sessions



GeoDjango (GIS)

Formulare


Admin

URLConf

Views


Sessions



GeoDjango (GIS)

Formulare

Validation


Admin

URLConf

Views


Sessions



GeoDjango (GIS)

Formulare

Validation

File Storage


Admin

URLConf

Views


Sessions



GeoDjango (GIS)

Formulare

Validation

File Storage

Authentifizierung


Admin

URLConf

Views


Sessions



GeoDjango (GIS)

Formulare

Validation

File Storage

Authentifizierung

Testing


Admin

URLConf

Views


Sessions



GeoDjango (GIS)

Formulare

Validation

File Storage

Authentifizierung

Testing

Caching


Admin

URLConf

Views


Sessions



GeoDjango (GIS)

Formulare

Validation

File Storage

Authentifizierung

Testing

Caching

i18n & l10n


Admin

URLConf

Views


Sessions



GeoDjango (GIS)

Formulare

Validation

File Storage

Authentifizierung

Testing

Caching

i18n & l10n

Middleware


Admin

URLConf

Views


Sessions



GeoDjango (GIS)

Formulare

Validation

File Storage

Authentifizierung

Testing

Caching

i18n & l10n

Middleware

Security

Code

$ pip install django


$ django-admin.py startproject myproject


$ django-admin.py startproject myproject

$ tree myprojectmyproject!"" manage.py#"" myproject !"" __init__.py !"" settings.py !"" urls.py #"" wsgi.py

$ cd myproject$ python manage.py runserver

$ python manage.py startapp pages

$ tree.!"" manage.py!"" myproject...#"" pages !"" __init__.py !"" models.py !"" tests.py #"" views.py

$ python manage.py startapp pages

from django.db import models

class Page(models.Model): title = models.CharField(u'Titel', max_length=100) slug = models.SlugField(unique=True) body = models.TextField(u'Inhalt')

class Meta: verbose_name = u'Seite' verbose_name_plural = u'Seiten'

def __unicode__(self): return self.title

myproject/pages/models.py

from django.contrib import admin

from .models import Page

class PageAdmin(admin.ModelAdmin): prepopulated_fields = {'slug': ['title']}

admin.site.register(Page, PageAdmin)

myproject/pages/admin.py

from django.conf.urls import patterns, include, url

from django.contrib import adminadmin.autodiscover()

urlpatterns = patterns('', url(r'^admin/', include(admin.site.urls)),)

myproject/urls.py

$ python manage.py syncdb$ python manage.py runserver

http://127.0.0.1:8000/willkommen-auf-der-startseite/


from django.contrib import adminadmin.autodiscover()

urlpatterns = patterns('', url(r'^admin/', include(admin.site.urls)), url(r'^', include('pages.urls')))

myproject/urls.py


urlpatterns = patterns('pages.views', url(r'^(?P<slug>[-\w]+)/$', 'detail'),)

myproject/pages/urls.py

from django.shortcuts import get_object_or_404, render

from .models import Page

def detail(request, slug): page = get_object_or_404(Page, slug=slug) context = {'object': page} return render(request, 'pages/detail.html', context)

myproject/pages/views.py

<!doctype html><body> <h1>My Website</h1> {% block content %}{% endblock %}</body></html>

myproject/templates/base.html

{% extends "base.html" %}

{% block content %}<h2>{{ object.title }}</h2><p>{{ object.body|linebreaks }}</p>{% endblock %}

myproject/pages/templates/pages/detail.html

Django Roadmap

• Stabile API

• Minor Release alle neun Monate

• Klare Deprecation Timeline

• Ab Django 1.5 experimentelle Python 3.3 Unterstützung

Entwicklungsprozess

Models & Admin anlegen

Inhalte erstellen Views anlegen

Deployment

Templates anlegen

Django in Zahlen

6.000.000 Besucher der Website pro Monat

Django in Zahlen


21.700 Abonnenten der django-users Mailing Liste

Django in Zahlen



> 2.000 Packages im Python Packaging Index (> 10%)

Django in Zahlen




33 Kern-Entwickler

Django in Zahlen




33 Kern-Entwickler

> 65 Übersetzungen

Django in Zahlen

Djangoin freier Wildbahn

ZDF - Die letzte Spur

ZDF - Die letzte SpurWashington Post


Rdio


RdioVodafone


RdioVodafone

Mozilla Add-Ons


RdioVodafone

Mozilla Add-OnsDiscovery Channel


RdioVodafone


VMWare


RdioVodafone


VMWareDisqus


RdioVodafone


VMWareDisqus

Instagram


RdioVodafone


VMWareDisqus

InstagramNational Geographic


RdioVodafone


VMWareDisqus

InstagramNational GeographicThe New York Times

Nützliche Django Apps

Django Debug Toolbar

http://robhudson.github.com/django-debug-toolbar/





Schema and Data Migrations

http://south.aeracode.org/

Celery

Distributed Task Queue

http://celeryproject.org/

Modular Search

http://haystacksearch.org/

WSGI HTTP Server for UNIX

http://gunicorn.org/

www.djangopackages.com

Fragen?

www.inqbus.de

www.keimlink.de

@keimlink