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Top 20 Django Interview questions

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NovelVista

Last updated 21/07/2021


Top 20 Django Interview questions

Imagine finding yourself in a spooky vampire movie. And imagine that you are completely unarmed there. You don’t have garlic in your hand, neither do you have a silver sped to fight them off. 

Yes, that’s exactly what you will feel if you step into your Python Django Developer interview. 

Django is one of the trickiest yet the most in-demand skill in today’s world along with Python for the developers. Django's primary goal is easing the creation of complex, database-driven websites. The framework emphasizes reusability and "pluggability" of components, less code, low coupling, rapid development, and the principle of not repeating.

These objectives make Django quite famous, don’t they?

That’s what most of the organizations think.

So, what are the most common Django interview questions you will encounter at your interview? Let’s find out!

1. Explain Django in brief.

Ans: Django is a Python-based free and open-source web framework that follows the model-template-views (MTV) architectural pattern. It is maintained by the Django Software Foundation (DSF), an American independent organization established as a 501(c)(3) non-profit.

Django was created in the fall of 2003, when the web programmers at the Lawrence Journal-World newspaper, Adrian Holovaty and Simon Willison, began using Python to build applications.

2. Differentiate between Flask and Django.

Ans. Make a table with the following one

Comparison Factor

Django

Flask

Project Type

Supports large projects

Built for smaller projects

Templates, Admin and ORM

Built-in

Requires installation

Ease of Learning

Requires more learning and practice

Easy to learn

Flexibility

Allows complete web development without the need for third-party tools

More flexible as the user can select any third-party tools according to their choice and requirements

Visual Debugging

Does not support Visual Debug

Supports Visual Debug

Type of framework

Batteries included

Simple, lightweight

Bootstrapping-tool

Built-it

Not available

 

3. State the features of Django.

Ans: Some of the exclusive features of Django are:

  • SEO Optimized
  • Extremely fast
  • Fully loaded framework along with authentications, content administrations, RSS feeds, etc
  • Very secure in order to help developers avoid common security mistakes like cross-site request forgery (csrf), clickjacking, cross-site scripting, etc
  • It is exceptionally scalable to help meet the heaviest traffic demands
  • Immensely versatile and empowers you to develop all kinds of websites

4. Which companies are using Django.

Ans. Instagram,  DISCUS, Mozilla Firefox, YouTube, Pinterest, Reddit are some organizations that are making use of Django in a huge way.

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

Ans To look for the version of Django installed on your system, you need to open the command prompt and the following command should be entered:

  • python -m django –version

As an option, you can try to import Django and use the get_version() method as follows:

1

2

import django

print(django.get_version())

 

6. State the advantages of using Django.

Advantages of using Django are as follows:

  • 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

7. How does Django architecture work?

Django follows the MVT or Model View Template engineering which depends on the MVC or Model View Controller design. The fundamental distinction between these two is that Django itself deals with the regulator part. 

As per Django, the 'view' essentially depicts the information introduced to the client. It doesn't manage how the information looks but instead what the information really is. Perspectives are fundamentally callback capacities for the predefined URLs and these callback capacities portray which information is introduced. 

The 'templates' then again manage the introduction of information, accordingly, isolating the substance from its introduction. In Django, sees representative to the formats to introduce the information. 

The 'controller' here is Django itself which sends the solicitation to the proper view as per the predetermined URL. This is the reason Django is alluded to as MTV as opposed to MVC design.

8. Give a brief about ‘Django-admin’.

Django-administrator is the command-line utility of Django for authoritative assignments. Utilizing the Django-administrator you can play out various assignments some of which are drilled down in the accompanying table:

Task

Command

To display the usage information and the list of the commands provided by each application

django-admin help

To display the list of available commands

django-admin help –command

To display the description of a given command and the list of its available options

django-admin help <command>

Determining the version of Django

django-admin version

Creating new migrations based on the changes made in models

django-admin makemigrations

Synchronizing the database state with the current set of models and migrations

django-admin migrate

Starting the development server

django-admin runserver

Sending a test email in order to confirm the email sending through Django is working

django-admin sendtestemail

To start the Python interactive interpreter

django-admin shell

To show all the migrations in your project

django-admin showmigrations

 

9. How do you connect your Django project to the database?

Django has a default database which is SQLite. To connect the project to SQLite, you need to use the following commands:

  1. python manage.py migrate (migrate command looks at the INSTALLED_APPS settings and creates database tables accordingly)
  2. python manage.py makemigrations (tells Django you have created/ changed your models)
  3. python manage.py sqlmigrate <name of the app followed by the generated id> (sqlmigrate takes the migration names and returns their SQL)

10. What are the various files that are created when you create a Django Project? Explain briefly.

While creating a project using the startproject command, the following files will be created:

File Name

Description

manage.py

A command-line utility that allows you to interact with your Django project

__init__.py

An empty file that tells Python that the current directory should be considered as a Python package

settings.py

Consists of the settings for the current project

urls.py

Contains the URL’s for the current project

wsgi.py

This is an entry-point for the web servers to serve the project you have created

 

11. What are ‘Models’?

Models are a solitary and authoritative hotspot for data about your information. It comprises of the apparent multitude of basic fields and practices of the information you have put away. Frequently, each model will guide to a solitary explicit information base table. 

In Django, models fill in as the reflection layer that is utilized for organizing and controlling your information. Django models are a subclass of the django.db.models.Model class and the traits in the models speak to information base fields.

12. What are ‘views’?

Django sees fill the need of epitome. They embody the rationale obligated for preparing a client's solicitation and for returning 

the reaction back to the client. Perspectives in Django either return a HttpResponse or raise a special case, for example, Http404. HttpResponse contains the items that comprise of the substance that will be delivered to the client. Perspectives can likewise be utilized to perform undertakings, for example, perused records from the information base, agent to the layouts, create a PDF document, and so on.

13. What are ‘templates’?

Django's template layer delivers the data to be introduced to the client in an originator neighborly organization. Utilizing layouts, you can produce HTML powerfully. The HTML comprises both static just as unique pieces of the substance. You can have quite a few formats relying upon the necessity of your undertaking. It is additionally fine to have none of them. 

Django has its own layout framework called the Django template language (DTL). Despite the backend, you can likewise load and render formats utilizing Django's standard administrator.

14. What is the difference between a Project and an App?

An application is essentially a Web Application that is made to accomplish something, for instance, an information base of worker records. A project, then again, is an assortment of applications of some specific site. In this way, a solitary project can comprise of 'n' number of applications and a solitary application can be in various activities.

15. What are the different inheritance styles in Django?

Django has three possible inheritance styles:

Inheritance style

Description

Abstract base classes

Used when you want to use the parent class to hold information that you don’t want to type for each child model. Here, the parent class is never used in solitude

Multi-table inheritance

Used when you have to subclass an existing model and want each

model to have its own database table

Proxy models

Used if you only want to modify the Python-level behavior of a model, without changing the ‘models’ fields in any way

16. What are static files?

Static files in Django are those records that fill the need of extra records, for example, the CSS, pictures or JavaScript documents. These documents are overseen by django.contrib.staticfiles. These records are made inside the task application catalog by making a subdirectory named as static.

17. What are ‘signals’?

Django comprises a sign dispatcher that permits decoupled applications to get informed when activities happen somewhere else in the structure. Django gives a bunch of inherent signs that essentially permit senders to tell a bunch of collectors when some activity is executed. A portion of the signs are as per the following:

Signal

Description

django.db.models.signals.pre_save

django.db.models.signals.post_save

Sent before or after a model’s save() method is called

django.db.models.signals.pre_delete

django.db.models.signals.post_delete

Sent before or after a model’s delete() method or queryset’s delete() method is called

django.db.models.signals.m2m_changed

Sent when Django starts or finishes an HTTP request

 

18. Briefly explain Django Field Class.

'Field' is fundamentally an abstract class that really speaks to a segment in the information base table. The Field class, is thusly, a subclass of RegisterLookupMixin. In Django, these fields are utilized to make information base tables (db_type()) which are utilized to plan Python types to the information base utilizing get_prep_value() and the other way around utilizing from_db_value() technique. In this manner, fields are crucial pieces in various Django APIs, for example, models and querysets.

 

19. How to do you create a Django project?

To make a Django venture, cd into the directory where you might want to make your undertaking and type the accompanying order:

  • Django-admin startproject xyz

20. What is mixin?

Mixin is a sort of multiple inheritances wherein you can consolidate practices and properties of more than one parent class. Mixins give a magnificent method to reuse code from different classes. For instance, conventional class-based perspectives comprise of a mixin considered TemplateResponseMixin whose reason for existing is to characterize render_to_response() strategy. At the point when this is joined with a class present in the View, the outcome will be a TemplateView class. 

One downside of utilizing these mixins is that it gets hard to examine what a youngster class is doing and which strategies to abrogate if there should arise an occurrence of its code being excessively dispersed between different classes.

Conclusion:

Got some more Django questions that you got asked during your interviews? Feel free to ask away! Our experts would be happy to get back to you. 

Also, tell us about your interview question requirements, and we will come up with an article on that as well.

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