Django - The Web framework for perfectionists with deadlines

The Web framework for perfectionists with deadlines Markus Zapke-Gründemann Webmontag Leipzig 29.03.2010

Übersicht • Über mich • Django in Deutschland • Was ist Django? • Weiterführende Links • Python • DjangoCon Europe • Architektur • Workshop in Leipzig • Django in freier Wildbahn

Markus Zapke-Gründemann • Softwareentwickler seit 2001 • Schwerpunkt: Web Application Development mit Python und PHP • Django, Symfony & Zend Framework • Freier Softwareentwickler und Berater seit 2008 • www.keimlink.de

Was ist Django?

Jean "Django" Reinhardt 23.1.1910 - 16.5.1953 Bildquelle: http://en.wikipedia.org/wiki/File:Django9.jpg

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

Und natürlich Ponies!

Ponies?

The Python logo is a trademark of the Python Software Foundation.

Guido van Rossum begann 1989 mit der Entwicklung von Python Bildquelle: http://commons.wikimedia.org/wiki/File:Guido_van_Rossum_OSCON_2006.jpg

class Input(Widget): """ Base class for all <input> widgets (except type='checkbox' and type='radio', which are special). """ input_type = None # Subclasses must define this. def render(self, name, value, attrs=None): if value is None: value = '' final_attrs = self.build_attrs(attrs, type=self.input_type, name=name) if value != '': # Only add the 'value' attribute if a value is non-empty. final_attrs['value'] = force_unicode(formats.localize_input(value)) return mark_safe(u'<input%s />' % flatatt(final_attrs)) Objektorientierte Sprache

Große Standardbibliothek Bildquelle: http://www.ﬂickr.com/photos/jhoweaa/327651705/

Unit Testing Bildquelle: http://www.ﬂickr.com/photos/sidelong/246816211/

Viele Betriebssysteme Alle Logos und Warenzeichen auf dieser Seite sind Eigentum der jeweiligen Besitzer und Lizenzhalter.

Gutes Programmierwerkzeug Bildquelle: http://www.ﬂickr.com/photos/philentropist/176054470/

Freie Software Bildquelle: http://www.ﬂickr.com/photos/gagilas/3809232008/

WSGI, FastCGI, mod_python Bildquelle: http://www.ﬂickr.com/photos/torkildr/3462607995/

Architektur

Full Stack Framework Middleware Tags Filter XML JSON YAML RSS Atom Testing Cache i18n Validatoren Formulare Template Serializer Syndication View Object Relational Mapper URLConf Models Applications Admin Unicode Datenbanken Python

Webserver

Webserver URLConf

Webserver URLConf Middleware

Webserver URLConf Middleware View

Webserver URLConf Middleware View Model (ORM)

Webserver URLConf Middleware View Model (ORM) Datenbank

Webserver URLConf Middleware View Template Model (ORM) Datenbank

Webserver URLConf Middleware View Template Model (ORM) Tags & Filter Datenbank

Model from django.db import models class Musician(models.Model): first_name = models.CharField(max_length=50) last_name = models.CharField(max_length=50) instrument = models.CharField(max_length=100) class Album(models.Model): artist = models.ForeignKey(Musician) name = models.CharField(max_length=100) release_date = models.DateField() num_stars = models.IntegerField()

URLConf from django.conf.urls.defaults import * extra_patterns = patterns('', url(r'reports/(?P<id>d+)/$', 'credit.views.report', name='credit-reports'), url(r'charge/$', 'credit.views.charge', name='credit-charge'), ) urlpatterns = patterns('', url(r'^$', 'apps.main.views.homepage', name='site-homepage'), (r'^help/', include('apps.help.urls')), (r'^credit/', include(extra_patterns)), )

View from django.shortcuts import render_to_response, get_object_or_404 from ponyfarm.models import Farm def farm(request, farm_id): farm = get_object_or_404(Farm, pk=farm_id) return render_to_response('ponyfarm/farm.html', {'farm': farm})

Template <html> <head> <title>{% block title %}My Pony Farm{% endblock %}</title> </head> <body> <h2>My Pony Farm</h2> {% block content %} {% endblock %} </body> </html> {% extends "base.html" %} {% block title %}{{ block.super }} - {{ farm.title }}{% endblock %} {% block content %} <h3>{{ farm.title }}</h3> <p>{{ farm.description|linebreaks }}</a></p> <p><a href="{% url ponyfarm_object_list %}">back to overview</a></p> {% endblock %}

Eingebauter Webserver $ python manage.py runserver Validating models... 0 errors found Django version 1.1.1, using settings 'ponysite.settings' Development server is running at http://127.0.0.1:8000/ Quit the server with CONTROL-C. [25/Mar/2010 17:48:50] "GET /admin/ HTTP/1.1" 200 1686 [25/Mar/2010 17:49:04] "POST /admin/ HTTP/1.1" 302 0 [25/Mar/2010 17:49:04] "GET /admin/ HTTP/1.1" 200 5674 [25/Mar/2010 17:49:08] "GET /admin/auth/user/ HTTP/1.1" 200 4788 [25/Mar/2010 17:49:14] "GET /admin/ HTTP/1.1" 200 5674 [25/Mar/2010 17:49:17] "GET /admin/auth/user/ HTTP/1.1" 200 4788

Django in freier Wildbahn

www.ljworld.com

www.theonion.com Bildquelle: http://twitter.com/TheOnion/status/10921296161

www.everyblock.com

disqus.com

www.rapidsms.org Bildquelle: http://www.rapidsms.org/about/take-the-tour/

ﬁlmaster.com

trailmapping.com

Django in Deutschland

Django-Entwickler Bildquelle: http://djangopeople.net/de/

Deutscher Django-Verein e.V. • Gegründet im Dezember 2009 • 16 Mitglieder • Kommunikation der Entwickler und Anwender fördern • Weiterentwicklung von Django voran treiben • www.django-de.org

Weiterführende Links • www.djangoproject.com • www.djangobook.com/en/2.0 • djangoplugables.com • www.djangosnippets.org • www.python.org • www.diveintopython.org

DjangoCon Europe

Python & Django Workshop • 17. April 2010 • Python: 9:00 bis 13:00 Uhr • Django: 14:00 bis 18:00 Uhr • Im Coworking Space „Le Space“ • Unkostenbeitrag: 10 EUR • Anmeldung: info@keimlink.de

Lizenz Dieses Werk ist unter einem Creative Commons Namensnennung-Weitergabe unter gleichen Bedingungen 3.0 Unported Lizenzvertrag lizenziert. Um die Lizenz anzusehen, gehen Sie bitte zu http://creativecommons.org/licenses/by-sa/3.0/ oder schicken Sie einen Brief an Creative Commons, 171 Second Street, Suite 300, San Francisco, California 94105, USA. Django is a registered trademark of the Django Software Foundation.

Django - The Web framework for perfectionists with deadlines

by Markus Zapke-Gründemann

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