Why Django for Web Development?

2. OutLine…
• What is Django?
• Django ad MVC Desing pattern
• Django Architecture
• Why Django for Web Development
• Steps to create new project
• What Django generates
• Sample Application

3. What is Django?
• “Django is a high-level Python Web framework that
encourages rapid development and clean, pragmatic
design”

4. Django ad MVC Desing pattern
• MVT Architecture:
Models:Describes your data structure/database schema
Views:Controls What a user sees
Templates:How a user sees it
Controller:The Django framework – URL Parsing

5. Django Architecture

6. Why Django for Web Development
• Lets you divide code modules into logical groups to make it
flexible to change…MVT design pattern
• Provides auto generate web admin to ease the website
administration
• Provides pre-packaged API for common user tasks
• Provide your template system to define Html template for
your web pages to avoid code duplication
• Allows you to define what URL be for a given function
• Everything is in python (schema/settings)

7. Steps to create New Project
 Create a project
 Start an application
 Create the database (MySQL, Postgresql, SQLite)
 Define DB Settings in Settings.py
 Define your models
 Add pluggable modules
 Write your templates
 Define your views
 Create URL mapping
 Test Application
 Deploy Application (Linux, Apache, mod_Python, DB)

8. What Django generates
mysite/
manage.py
mysite/
django-admin.py startproject mysite __init__.py
settings.py
urls.py
wsgi.py
polls/
__init__.py
admin.py
python manage.py startapp blog migrations/
__init__.py
models.py
tests.py
views.py
Create a project
Start an application

9. blog/models.py file so it looks like this:
class Post(models.Model):
title = models.CharField(max_length=100,unique=True)
slug = models.SlugField(max_length=100,unique=True)
content = HTMLField()
created = models.DateTimeField(db_index=True)
meta_desc = models.CharField(max_length=150,blank=True)
author = models.ForeignKey(User)
category = models.ForeignKey('Category')
published = models.BooleanField(default=False)
tags = TaggableManager()
def __unicode__(self):
return "%s" % self.title
def get_absolute_url(self):
return reverse('showpost',args=[str(self.category.slug),str(self.slug)])

10. blog/views.py file so it looks like this:
def main(request):
"""Main listing."""
posts = Post.objects.all().order_by("-created")
paginator = Paginator(posts, 4)
try: page = int(request.GET.get("page", '1'))
except ValueError: page = 1
try:
posts = paginator.page(page)
except (InvalidPage, EmptyPage):
posts = paginator.page(paginator.num_pages)
return render_to_response("postlist.html", dict(posts=posts, user=request.user))
class IndexView(ListView):
queryset = Post.objects.filter(published=True).order_by('-created')

11. Thanks!
life is short - you need Python!
@py_Django
@Morteza Dariushi