Django Web Framework Basics

Tango with Django
By Jaysinh Shukla

Speaker Description
Self employed Pythonista
Github: http://github.com/ultimatecoder, http://github.com/jsh-odoo
Twitter: @jaysinhp
Emai: jaysinhp@gmail.com
IRC: thebigj
Blog: http://blog.jaysinh.com

What is Django?
● Django is Python’s most popular web framework.
● Lawrence Journal-World is the popular daily newspaper publishing
company who started developing web framework for publishing news over
website. That framework is known as the Django web framework.
● At present the development is going under the Django Software
Foundation
● Initially it was started before 10 years!

Benefits of Django
● Open source
● Large community base
● MVC
● Secure
● Fast Web application development
● Scalable

Who is using Django?
● Pinterest
● Instagram
● Mozilla
● Bitbucket
● NASA
● Open Stack

MVC vs MVT
● Django is MVC but usually people call it Model View Template
● The Model part is used for all the Data Base operations and managing
record as object
● View part is used for managing, filtering, creating, deleting records of
Model
● Template part is used for combining model object with the HTML
templates

Create virtual environment
● You can use `venv` builtin module of Python.
○ `python3 -m venv my_virtualenv`
● Virtualenvwrapper
○ https://virtualenvwrapper.readthedocs.io/en/latest/
● Virtualenv
○ https://pypi.python.org/pypi/virtualenv

Make requirements.txt
● Always dump your installation package to `requirements.txt` file.
○ $>pip freeze > requirements.txt
● The requirements.txt is a not a fix file name. It is just a convention.

Create a website
● Create website first
○ django-admin startproject mysite
● Here, `mysite` is name of website.
● Mysite directory
● ├── manage.py
● ├── mysite

Project vs App
● App is pluggable project
● Django follows DRY principle
● Project is a website in which there can be more than one collection of app.

Start app
● Startapp
○ `python manage.py startapp blog`
● Mysite
● │ ├── admin.py
● │ ├── __init__.py
● │ ├── models.py

Blog Post model structure
● Title
● Text
● Create date
● Published
● Author

Adding fields to model
class Post(models.Model):
title = models.CharField(max_length=200)
text = models.TextField()
created_date = models.DateTimeField(auto_now_add=True)
published = models.BooleanField(default=False)
author = models.ForeignKey(User, blank=True, null=True)
def __str__(self):
return self.title

A walk on Django migrations
● Migrations are app specific thing
● Always commit them
● Why migrations?
● Django will warn when you will make incompatible migrations
● ├── migrations
● │ │ ├── 0001_initial.py

Introduction to Django contribution modules
● https://docs.djangoproject.com/en/1.8/ref/contrib/
● django.contrib.auth
● django.contrib.contenttypes
● django.contrib.sessions
● django.contrib.messages
● django.contrib.staticfiles

Introduction to Django admin
● Django admin panel is for managing website
● Do not make it available to all the users
● You can customize it, but remember it is for admin

Createsuperuser
● `python manage.py createsuperuser`
● Super user has all the authority.

Django shell
● model.objects.all()
● model.objects.filter()
● model.objects.get()
○ model.DoesNotExists
● Chaining
● len()

Creating view
● A view where all the blog posts are displayed in one title
● A view where single blog post is viewed

Adding templates
● Create templates dir under application
○ Templates/blog/base.html
○ templates/blog/list.html
○ templates/blog/single.html

Base template
● <html>
● <head>
● <title>{% block title %} {% endblock %} </title>
● </head>
● <body>
● {% block body %} {% endblock %}

Single Post
● {% extends 'blog/base.html' %}
● {% block title %} {{ post.title }} {% endblock %}
● {% block body %}
● <table>

List view
● {% extends 'blog/base.html' %}
● {% block title %} List of blogposts {% endblock %}
● {% block body %}
● {% for post in posts %}
● <table><tr><td><a href="{% url 'single_post' post.id %}">{{ post.title }}</a>
</td></tr>

Type of views
● Function based views
● Class based views
● Built in views

Understanding Regex
● ^
● $
● ()
● ?P
● <variable_name>
● https://docs.python.org/3.4/library/re.html

Create urls Blog
● List post(http://localhost:8000/post/)
○ url(r'^$', views.list_post),
● Single post (http://localhost:8000/post/id)
○ url(r'^(?P<post_id>[0-9]+)/$', views.single_post, name='single_post')

Creating views
● def single_post(request, post_id):
● try:
● post = Post.objects.get(id=post_id)
● except Post.DoesNotExists:
● return Http404("Post didn't found")
● return render(request, 'blog/post.html', {'post': post})

How to learn Django?
● Read tutorials section divided into 6 parts of Django
https://media.readthedocs.org/pdf/django/1.8.x/django.pdf
● Contribute to any live project
○ Make website for your community
○ Try to SaaSify (SaaS) any existing tool
○ Help Pythonexpress.in (https://github.com/pythonindia/wye)
○ Do volunteering

Feedback
https://goo.gl/forms/YIqstv2
cmoyLjZul2

Django Web Framework Basics

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