INTRODUCTION ABOUT DJANGO-PYTHON WEB FRAMEWORK

 

What is Django:

Django is a popular python-based backend  framework, and it is used for web development. It is a high-level web framework that allows building secure and maintainable websites quickly.

Django is a free and open-source framework, which means it is free to use.

Django also follows Model-View-Controller (MVC) architecture, which is now the standard for web application development.

Django emphasizes reusability of components, also referred to as DRY (Don't Repeat Yourself), and comes with ready-to-use features like login system, database connection and CRUD operations (Create Read Update Delete).

Django is especially helpful for database driven websites.

 

What is a web framework:

Web framework is a Collection of modules, packages and libraries designed to speedup the development.

 

History of Django:

Django was created in the year 2003 by Adrian Holovaty and Simon Willison when they started using Python to develop a web application.

It was released in July 2005 under the BSD license and was named after the guitarist Django Reinhardt.

In the year 2008, a foundation named Django Software Foundation (DSF) was established to maintain Django.

 

Django Architecture

Django follows its own convention of Model-View-Controller (MVC) architecture named Model View Template (MVT). The MVT is a software design pattern that mainly consists of 3 components Model, View, and Template.

Model - The data you want to present, usually data from a database.

View - A request handler that returns the relevant template and content - based on the request from the user.

Template - A text file (like an HTML file) containing the layout of the web page, with logic on how to display the data.

 

Model:

The model provides data from the database.

In Django, the data is delivered as an Object Relational Mapping (ORM), which is a technique designed to make it easier to work with databases.

The most common way to extract data from a database is SQL. One problem with SQL is that you have to have a pretty good understanding of the database structure to be able to work with it.

Django, with ORM, makes it easier to communicate with the database, without having to write complex SQL statements.

The models are usually located in a file called models.py.

 

View:

A view is a function or method that takes http requests as arguments, imports the relevant model(s), and finds out what data to send to the template, and returns the final result.

The views are usually located in a file called views.py.

Templates:

A template is a file where you describe how the result should be represented.

Templates are often .html files,but it can also be in other file formats to present other results.

Django uses standard HTML to describe the layout, but uses Django tags to add logic

The templates of an application is located in a folder named templates.

Urls:

Django also provide a way to navigate around the different pages in a website.

When a user requests a URL, Django decides which view it will send it to.

This is done in a file called urls.py.

 

How Django Works:

When you have installed Django and created you first Django web application, and the browser requests the URL, this is basically what happens:

1. Django receives the URL, checks the urls.py file, and calls the view that matches the URL.
2. The view, located in views.py, checks for relevant models.
3. The models are imported from the models.py file.
4. The view then sends the data to a specified template in the template folder.
5. The template contains HTML and Django tags, and with the data it returns finished HTML content back to the browser.

Features of Django:

Open-Source– Django is an open-source python framework, which means we can download and use it for free. This helps to reduce the overall cost of the application.

Fast Development– Django was designed with the goal of creating a framework that would allow developers to develop web applications in less time. So, Django reduces the project implementation, allowing rapid web development.

Scalable– Django is scalable in nature, which means we can easily migrate from a small-scale application to a large-scale application.

Secure– Django is a secure framework as it provides tools to assist developers to avoid typical security problems. It also provides an authentication system to store manage user accounts and passwords.

Largely supported libraries– Django contains a large set of modules and libraries that can be used to manage different web development tasks.

Admin Interface– Django comes with a build-in admin interface. So, we don’t need to build it from the scratch. Also, we can customize the interface according to the requirements.

Large Community– As Django is one of the most popular web development framework. So, it has a large and friendly community as well as channels for sharing and connecting.

  

Companies Using Django: 

Django is simple and easy to use, additionally, it offers so many things which make it a perfect framework for any type of web application. Django is so efficient that some of the big companies are also using it for their web application. Here are some of the companies which use Django.

• Instagram 
• Spotify
• Mozilla
• National Geographic
• Pinterest
• Bitbucket
• Eventbrite