Django Interview Questions and Answers for all

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Explain Django.

Django is a free and open source web application framework, written in Python. It is a server-side web framework that provides rapid development of secure and maintainable websites.

Which foundation manages the Django web framework?

Django web framework is managed and maintained by an independent and non-profit organization named Django Software Foundation (DSF). The primary foundation goal is to promote, support, and advance the Django Web framework.

Name some companies that make use of Django?

Some of the companies that make use of Django are Instagram, DISCUS, Mozilla Firefox, YouTube, Pinterest, Reddit, etc.

Django Interview Questions

What are the features of Django? 

  • SEO Optimized
  • Extremely fast
  • Fully loaded framework that comes along with authentications, content administrations, RSS feeds, etc
  • Very secure thereby helping developers avoid common security mistakes such as cross-site request forgery (csrf), clickjacking, cross-site scripting, etc
  • It is exceptionally scalable which in turn helps meet the heaviest traffic demands
  • Immensely versatile which allows you to develop any kind of websites

How do you check for the version of Django installed on your system?

To check for the version of Django installed on your system, you can open the command prompt and enter the following command:

  • python -m django –version

You can also try to import Django and use the get_version() method as follows:

12import djangoprint(django.get_version())

What are the advantages of using Django?

  • Django’s stack is loosely coupled with tight cohesion
  • The Django apps make use of very less code
  • Allows quick development of websites
  • Follows the DRY or the Don’t Repeat Yourself Principle which means, one concept or a piece of data should live in just one place
  • Consistent at low as well as high levels
  • Behaviors are not implicitly assumed, they are rather explicitly specified
  • SQL statements are not executed too many times and are optimized internally
  • Can easily drop into raw SQL whenever required
  • Flexibility while using URL’s

Why do web developers prefer Django?

Web developers use Django because it:

  • Allows code modules to be divided into logical groups, making them flexible to change
  • Provides an auto-generated web admin module to ease website administration
  • Provides a pre-packaged API for common user tasks
  • Enables developers to define a given function’s URL
  • Allows users to separate business logic from the HTML
  • Is written in Python, one of the most popular programming languages available today
  • Gives you a system to define the HTML template for your web page, avoiding code duplication

What is CRUD?

It has nothing to do with dirt or grime. It’s a handy acronym for Create, Read, Update, and Delete. It’s a mnemonic framework used to remind developers on how to construct usable models when building application programming interfaces (APIs).

Does Django have any drawbacks?

Django’s disadvantages include:

  • Its monolithic size makes it unsuitable for smaller projects
  • Everything hinges on Django’s ORM (Object-Relational Mapping)
  • Everything must be explicitly defined due to a lack of convention

What are the inheritance styles in Django?

There are three possible inheritance styles in Django:

1. Abstract base classes: This style is used when you only want parent?s class to hold information that you don’t want to type out for each child model.

2. Multi-table Inheritance: This style is used if you are sub-classing an existing model and need each model to have its own database table.

3. Proxy models: This style is used, if you only want to modify the Python level behavior of the model, without changing the model’s fields.

How can you set up the database in Djanago?

To set up a database in Django, you can use the command edit mysite/setting.py , it is a normal python module with module level representing Django settings.

By default, Django uses SQLite database. It is easy for Django users because it doesn’t require any other type of installation. In the case of other database you have to the following keys in the DATABASE ‘default’ item to match your database connection settings.

Engines: you can change database by using ‘django.db.backends.sqlite3’ , ‘django.db.backeneds.mysql’, ‘django.db.backends.postgresql_psycopg2’, ‘django.db.backends.oracle’ and so on

Name: The name of your database. In the case if you are using SQLite as your database, in that case database will be a file on your computer, Name should be a full absolute path, including file name of that file.

Note: You have to add setting likes setting like Password, Host, User, etc. in your database, if you are not choosing SQLite as your database.

What is the difference between a project and an app in Django?

In Django, a project is the entire application and an app is a module inside the project that deals with one specific requirement. E.g., if the entire project is an ecommerce site, then inside the project we will have several apps, such as the retail site app, the buyer site app, the shipment site app, etc.

What is Django Admin Interface?

Django comes with a fully customizable in-built admin interface, which lets us see and make changes to all the data in the database of registered apps and models. To use a database table with the admin interface, we need to register the model in the admin.py file.

Explain Django’s Request/Response Cycle.

In the Request/Response Cycle, first, a request is received by the Django server. Then, the server looks for a matching URL in the urlpatterns defined for the project. If no matching URL is found, then a response with 404 status code is returned. If a URL matches, then the corresponding code in the view file associated with the URL is executed to build and send a response.

What is the use of the include function in the urls.py file in Django?

As in Django there can be many apps, each app may have some URLs that it responds to. Rather than registering all URLs for all apps in a single urls.py file, each app maintains its own urls.py file, and in the project’s urls.py file we use each individual urls.py file of each app by using the include function.

Why is Django called a loosely coupled framework?

Django is called a loosely coupled framework because of its MVT architecture, which is a variant of the MVC architecture. It helps in separating the server code from the client-related code. Django’s models and views take care of the code that needs to be run on the server like getting records from database, etc., and the templates are mostly HTML and CSS that just need data from models passed in by the views to render them. Since these components are independent of each other, Django is called a loosely coupled framework.

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