Are you getting ready for Django interviews? Then, this is the right blog for you. In this blog, we have curated the key Django interview questions with accurate answers for beginners and advanced learners. Also, we have included Django developers' skills and job responsibilities in this blog. At the end of the article, you will gain a comprehensive knowledge of the Django framework and get ready to ace your Django interviews on the first attempt.
Know that Django is a robust Python web framework with a flexible architecture and template engine. According to Statista, Django is one of the frontline frameworks that companies widely use to develop their web applications. That’s why the demand for Django developers remains high all the time.
If you aspire to become a Django developer, it is essential to thoroughly understand the Django concepts before appearing for interviews. To help you, I have prepared this article, including the frequently-asked Django interview questions with perfect answers. It will help you to breeze through your Django interviews with flying colours. Let’s get started!
Table of Contents
We have compiled the Django interview questions for beginner-level Django aspirants in this section. It will help to establish a strong foundation on Django concepts Let’s dive in!
Django is an open-source, high-level Python web framework that allows developers to make web applications quickly. We can develop secure web applications with fewer codes using this framework.
Django framework offers better versatility, scalability, and portability in application development. We can develop any application using Django, from content management systems to social networks to news sites. Besides, Django enables key application protection mechanisms against common vulnerabilities by default.
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Below are the reasons why we use Django.
Django is mainly a back-end web framework. However, it has some features of a front-end framework as well. So, Django is a suitable framework for both back-end and front-end web development.
The latest version of Django is Django 5.0.4. The new features of Django 5.0.4 are listed below:
Python is a programming language for developing machine learning, desktop applications, artificial intelligence, and more. It is a simple and readable language that supports OOP concepts.
On the other hand, Django is a web framework that provides tools and libraries for quickly building web applications. It is a complex framework that follows the MVT architecture.
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Django follows the Model-View-Template (MVT) architecture. MVT is a software design pattern that supports the development of web applications. It contains three parts: Model, View, and Template.
In Django, we can copy applications from one directory to another using the settings.py file. Developers can copy similar codes from another directory without writing them again. They can write codes only for unique operations. So, it allows for the rapid development of web applications.
Furthermore, Django offers many features that allow code reusability. We can use apps, mixins, generic views, and template inheritance to avoid repetition in writing codes. As a result, we can improve code quality, maintainability, and collaboration in application development.
The key features of Django are:
Django supports three inheritance styles. They are:
A Django model is a single source of information for data. A model is a Python class that helps define database table structure. It includes the essential fields and behaviours of the data. Django uses models to create database tables and fields. So, each model maps a database table. Also, each attribute of the model maps to a column in the table.
We create Django models to store data in databases effectively since they provide simplicity, consistency, and version control. Django models work as an abstraction layer that structures and manipulates database data. They support processing complex queries efficiently.
The below code is an example of the Django model. It defines a person by its first and last name.
Settings.py files contain the configuration details of Django projects. We can find the settings.py file in the root directory. This file is a Python module, so we can easily import it into other modules.
The settings.py file has all the details of a Django project, such as databases, back-end engines, middleware, main URL configurations, static file addresses, hosts and servers, and many more. When Django responds to a request, it executes the settings.py file and loads the databases and engines to serve the request.
In Django, CSS, images, or JavaScript are known as the files. Static files are the additional files that are essential for developing a web application. The Django static files are stored in a static directory within each Django app.
Generally, static files are larger, so when an application's complexity increases, the static files' size also increases. So, handling these large files is a challenge for developers.
We can make three things to set up static files in Django:
A Middleware in Django is a lightweight, low-level plugin that we use to process requests and responses in Django. It helps to perform various functions like security, session, CSRF protection, authentication, etc.
Django has many built-in middleware out of the box. Each middleware is responsible for performing a specific function. For example, AuthenticationMiddleware deals with user requests related to sessions.
In Django, TextField stores paragraphs and all other text data.
On the other hand, CharField is a string field used for small to large strings. It is similar to the string field in C/C++. In Django, we use CharField to store small strings like first name, last name, etc.
Every field in a model is an instance of the appropriate field class.
The column type in Django describes what kind of data to store (e.g., VARCHAR, INTEGER, and TEXT).
The default HTML widget is shown below while rendering a form field.
(e.g < input type = "text" >, <select>)
The minimal validation requirements are used in automatically generated forms and Django admin.
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The app is a module that deals with the dedicated requirements of a project. On the other hand, the project covers an entire app. Also, a project can contain different apps.
Django includes a "signal dispatcher" to notify decoupled applications when some action occurs in the framework. Signals in Django allow specific senders to inform a set of receivers that some action has occurred. They are instrumental when we use more codes in the same events.
Django uses sessions to keep track of the state between sites and browsers. Django supports anonymous sessions. The session framework stores and retrieves data on a per-site-visitor basis. It stores the information on the server side and supports sending and receiving cookies. Cookies store the session ID data but not the actual data.
Congrats! You have gone through the basic level Django interview questions. We hope you have gained the confidence to learn the advanced interview questions.
We have included the crucial Django interview questions and answers in this section. It will help explore the Django framework further and learn its in-depth concepts. Let’s move on!
The below diagram shows the working cycle of Django MVT architecture:
In the Django MVT architecture, the template is present on the client side, and both the Model and View are on the Server side. Django uses the request and response objects to enable communication between the client and server.
When a website receives a request, the request is transmitted from the browser to the server. After sending the correct URL request, the app logic and Model initiate the right response. Then, a detailed response is sent back to view to check the response and transmit it as a desired user format or HTTP response. Then, the response is passed to the browser via Templates.
For example, when we log into a Django-based website, we open the login page. It happens because the View will process and send the request to the login page URL. Then, the response is sent from a server to the browser. After that, we will enter the credentials in a template, and the data will be returned to the View. Then, data is presented in the Model. The Model verifies the data provided by the user in the connected database. If the user's data matches, it sends the related data (image, profile name, etc.) to the Views. Otherwise, the Model passes the negative result to the Views.
Django allows designing URL functions. We need to create a Python module called URLconf (URL configuration). This module acts as a mapping between Python functions and URL path expressions. The length of this mapping can be long or short as required and also reference other mappings. Besides, Django provides a way to translate URLs.
An exception is an abnormal event that leads to program failure. Django uses its Python exceptions and exception classes to deal with abnormal events. We define Django exceptions in "Django.core.exceptions". Below are some of the Django exceptions.
Exception | Description |
AppRegistryNotReady | This class raises for using models before loading the app process. |
EmptyResultSet | This exception arises when the query fails to return results. |
FieldDoesNotExist | When the requested file does not exist, this exception arises. |
FieldError | When there is a problem with the model field, this exception arises. |
ImproperlyConfigured | When Django configuration is improper, this exception arises. |
MultipleObjectsReturned | It raises the query multiple objects returned when we expect only one object. |
MiddlewareNotUsed | When there is no middleware in the server configuration, this exception arises. |
ObjectDoesNotExist | It’s a base class for DoesNotExist exceptions. |
PermissionDenied | It arises when a user does not have permission to execute a specific action requested. |
SuspiciousOperation | It raises when the user has performed some operation. It is considered suspicious from a security perspective. |
ViewDoesNotExist | When the requested View does not exist, this exception is raised. |
ValidationError | It raises when data validation fails. |
Know that a cookie is information stored in the client's browser. Django provides built-in methods to set and fetch cookies. We use the set_cookie() method for setting a cookie and the get() method for getting the cookie. We can also use the request.COOKIES['key'] array to get cookie values.
Flask and Django are the two most popular Python web frameworks. The following table lists some significant differences between Django and Flask.
Parameters | Django | Flask |
Nature of the tool | Django is a web development framework for Python. It was created in 2005 | Flask is a web microframework offering basic features of web apps. It was created in 2010 |
Key features |
|
|
Type of the Framework | Full-stack web framework | Web Server Gateway Interface (WSGI) framework |
Templates, Admin, and ORM | Built-in | Requires installation |
Flexibility | It supports a large number of third-party applications. | It doesn’t support third-party applications. |
Companies use the framework | Instagram, Udemy, Coursera, etc | Netflix, Lyft, Reddit, MIT, etc. |
Visual Debugging | It does not support visual debugging. | It supports visual debugging. |
Bootstrapping tool | Builtin | Not available |
Working style | Offers monolithic working style | Offers diversified working style |
Project layout structure | Conventional | Random |
To check the version of Django installed on systems, we need to open the command prompt and enter the following command:
py -m django --version
We can also try to import Django and use the get_version() method as follows:
import django
print (django.get_version( ))
Django Admin is the command-line utility for administrative tasks. It's a preloaded interface to fulfil all web developer needs. It is imported from the "django.contrib packages". The Django Admin interface has its user authentication. It offers advanced features like authorising access, managing various models, Content Management System, etc.
We can perform the following tasks using Django admin as listed in the table:
Command | Task |
django-admin help | It displays the usage of the information and commands list each application provides. |
django-admin help –command | It displays available commands |
django-admin help <command> | It displays the command description and its available options |
django-admin version | It determines Django’s version |
django-admin make migrations | It creates new migrations depending on the changes done in the Model |
django-admin migrate | It synchronises the database state with the present set of models and migrations |
django-admin runserver | It starts the development server |
django-admin sendtestemail | It is a test mail sent to confirm the Django email working status |
django-admin shell | It starts the Python interactive interpreter |
django-admin showmigrations | It displays all the project’s migrations |
To create a Django project, first navigate to the directory where we want to do a project and type the following command:
django-admin startproject MM
This command will create the folder named MM in the following structure.
ABC/
manage.py
myproject/
_ init_.py
settings.py
urls.py
wsgi.py
Django views are the critical component of the Django framework. They support encapsulation. They encapsulate the logic required to process a user's request and return a response to the user. They return HTTP responses or raise an exception such as 404 in Django. Besides, views perform tasks like reading records from a database, generating PDF files, etc.
Every app in Django comes with a views.py file. The file contains the views functions. We can import the Views functions directly in the URL file in Django. We must first import a view function into the urls.py file to achieve that. Then, we must add the path/URL to call that View function.
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Django templates generate dynamic web pages. Using templates, we can show the static data. We can also show the data from various databases connected to the app through a context dictionary. We can create any number of templates based on project requirements. The Django template engine handles the templating in the Django web framework. Some template syntaxes declare variables, control logic, filters, and comments.
In Django, one of the crucial features is Object-Relational Mapper (ORM). It allows interaction with app data from relational databases such as MySQL, SQLite, and PostgreSQL.
Django ORM is the abstraction between web application data structure (models) and the database where the data is stored. We can retrieve, save, delete, and perform other database operations without writing code. The main advantage of ORMs is speed and portability. We can easily change databases with Django ORM.
In Python, Iterators are containers that contain several elements. Every object in an iterator implements two methods. They are __init__() and the __next__() methods.
In Django, we use iterators to process results that consume colossal memory space. We can use the iterator() method to overcome this problem. This method evaluates the QuerySet and returns the corresponding iterator over the results.
Django supports a robust cache system that saves web pages. So we don’t need to evaluate them repeatedly for every request.
The following table lists the strategies used in Django caching.
Strategy | Description |
Memcached | The most efficient and faster memory-based cache server |
Filesystem Caching | It stores the cached files in serial order in separate files. |
Local-memory Caching | If we have not specified anything else, this is the default cache. |
Database Caching | It stores cached data in databases. It works well if we have a well-indexed database server. |
Whenever the Django Server receives a request, the system follows an algorithm to determine which Python code needs execution.
Here are the steps that sum up the algorithm:
Python 3.12.3 is the most recommended version for Django. This version is faster and has many features, so it is better supported.
A typical Django project consists of these four files:
The final four files exist inside a directory at the same level as manage.py.
manage.py is the command-line utility of the Django project. It controls the Django project on the server.
settings.py file includes information on all the apps installed in the project.
The urls.py file acts as a map for the whole web project.
The __init__.py file is typically empty. It allows the Python interpreter to understand that the directory consisting of settings.py is a module/ package.
The wsgi.py file is for the server format WSGI.
Django is known as a loosely coupled framework because of its MVT architecture. This architecture supports discarding server code from the client's machine. In this architecture, models and views lie on the client machine.
All components of this architecture are different from each other. Both front-end and back-end developers can work on projects at the same time using this framework.
Django REST framework is a flexible and powerful toolkit for rapidly building web APIs. The following are the reasons that make the REST framework a perfect choice:
Forms in Django help to receive user inputs and use that data for logical operations on databases. Django supports form classes for creating HTML forms. Django's forms handle the following parts:
Great! You have completed learning the crucial interview questions and answers in this section. We hope they have greatly improved your expertise in the Django framework.
We have developed the expert-level Django interview questions and answers in this section. It will undeniably help you gain in-depth knowledge of the Django framework. Let’s go ahead!
The Django framework is monolithic, which is valid to some extent. As Django's architecture is MVT-based, developers must follow some rules to execute the appropriate files at the right time. With Django, we get significant customisations with implementations. We cannot change variable names, file names, and predefined lists.
Django's file structure follows the logical workflow. Django's monolithic behaviour helps developers understand the project efficiently.
Django has a built-in user authentication system to handle objects such as users, permissions, groups, etc. It not only performs authentication but authorisation as well.
The following are the system objects:
Apart from that, Django supports many third-party web apps that we can use instead of the default system to provide more user authentication.
We use the render function when a view function returns a web page as HTTPResponse instead of a simple string. Render is a shortcut for passing a data dictionary with a template. This function uses a templating engine to combine templates with a data dictionary.
Finally, the render() returns the HttpResponse with the rendered text.
Syntax:
render (request, template_name, context=None, content_type=None, status=None, using=None)
This request generates an HTTP response. It has the template name and other parameters.
There are two ways to add the view function to the main URL config:
Protecting user's data is an essential part of any website design. Django implements various sufficient protections against several common threats.
The following are Django's security features:
Asynchronous JavaScript And XML’ (AJAX) allows web pages to update asynchronously to and from the server by exchanging data in Django. So we can update parts of the web page without reloading a complete webpage.
AJAX involves a combination of a browser built-in XMLHttpRequest object, HTML DOM, and JavaScript.
We can handle Ajax requests in the Django web framework using the following:
Django offers an easy way to set views called Generic Views. They are classes but not functions and are stored in "django.views.generic".
Generic views act as a shortcut for common usage patterns. They take some common idioms and patterns in the View development and abstract them to write common views of data without repetition.
We can use the ‘RequestContext’ when all our templates need the same objects. This method takes HTTPRequest as the first parameter and simultaneously populates the context with a few variables based on the engine's context_processors configuration option.
We must set the SESSION_ENGINE settings to ‘Django.contrib.sessions. Back-ends.file’ for a file-based session.
The “Django-admin.py load data” command loads data in Django. This command line performs data searching and loads the contents of the named fixtures into databases.
When a process in Django starts, the Django server receives a request and checks for a matching URL in the project-defined URL patterns. If the URL matches, it executes the associated code in the view file with the URL and sends a response. If the server can’t find a matching URL, it invokes the 404 status code.
We use Middleware in Django for the below requirements.
Django does not support multiple-column primary keys. It only supports single-column primary keys.
QuerySet is a set of SQL queries in Django. When we want to view the SQL query from the Django filter call, we must type the command print(b.query).
First, we must ensure that the DEBUG setting is set to True. We need to type the following commands.
No, Django signals are synchronous. There is no background thread or asynchronous jobs to execute them. Using signals in applications allows maintaining the code to understand application behaviour and solve issues faster.
Django migration is an automatic way of passing changes we make in Django models into the database schema. The changes can be adding a field, deleting a model, etc.
We can use many commands to manage database schema and migrations. They are:
Class-based views allow for implementing views as Python objects instead of functions. They don’t replace function-based views but have many advantages when compared with function-based views.
Class-based views support responding to different HTTP request methods with different class instance methods. It eliminates the need to use conditionally branching code inside a single view function.
The below example shows the use of class-based views in a code.
from django.http import HttpResponse
from django.views import View
class MyView(View)
def get(self, request):
# <view logic>
return HttpResponse("result")
Function-based views are easy to read and implement. They support explicit code flow and allow the use of decorators. But at the same time, they create code redundancy.
We can write function-based views on the views.py file. However, we can write these views in different files as well. The important thing is that a function-based view must return its subclasses or HTTP response. That’s because an HTTP response contains various information that Django configures automatically.
The below code shows the use of function-based views in Django.
from django.http import HttpResponse
def dashboard_view(request):
# write your view processing logics here
return HttpResponse("Welcome to MindMajix")
Docker is an open-source containerisation tool that helps to create, run, and deploy containers. Containers are the packages of applications, libraries, and system tools required to run the applications. We can run Docker on any platform seamlessly.
Kubernetes is an open-source container orchestration tool. We can use Kubernetes to manage, automate, and scale containerised applications. With Kubernetes, we can manage Microservices at scale. Here, each microservice is made up of multiple containers.
We use message brokers in Django to send and receive messages, decouple application components, manage asynchronous processes, and more. Message brokers use message persistence and retry mechanisms to deliver messages successfully. They leverage load balancing and message routing methods to scale applications seamlessly.
Django uses many models or patterns to implement message brokers. They are:
The Django OAuth toolkit provides all the data, endpoints, and logic required to add OAuth2 capabilities to Django projects. We can use the OAuth toolkit to integrate keycloak with Django projects.
We can optimise the performance of Django applications in the following ways.
A project is a container with configurations for web applications and apps. When we start a new Django project, it generates files with configurations. The components of a Django project are settings, WSGI, URLs, and ASGI.
On the other hand, the app has specific functionalities. An app consists of modules related to the specific features of the application that we develop. Like a Django project, an app generates files when we start it. The components of a Django app are views.py, admin.py, models.py, and urls.py.
We can use the steps below to create custom middleware in Django.
Super! You have completed learning Django interview questions successfully. Now, you are supercharged with the knowledge of Django and prepared to crack your Django interviews.
Yes, Django is an easy-to-learn framework. Having knowledge of Python and web development will help to learn Django quickly. MindMajix offers 15 hours of Django training for both beginners and advanced learners. The training is unique since MindMajix offers this training with an industry-designed course curriculum providing much importance to hands-on practice.
No, Django is not a CMS. It is a web framework with which you can build web applications.
Companies like Instagram, Pinterest, YouTube, Spotify, NASA, DropBox, Mozilla Firefox, Google, etc., use Django to build their web applications.
A Django developer is a software professional with expertise in the Django web framework. They build web applications using Python programming language. They design back-end components to connect applications with web services.
Django is a web framework that offers better security, scalability, rich libraries, and more. It supports building robust web applications effortlessly. The job opportunities for Django developers are bright and promising. AmbitionBox says entry-level Django developers earn up to 7.5 LPA in India. According to Talent, Django developers can earn an average of 120k USD annually in the USA.
In this section, I have provided the primary and secondary skills required for Django developers. Additionally, you will go through the job responsibilities of Django developers at various expertise levels in this section.
Primary Skills Required For Django Developers
Let’s go through the essential skills every Django developer must have.
Secondary Skills Required For Django Developers
Let's find the additional skills needed for Django developers in the following.
For 1-2 Years of Experienced Candidates
Below are the key activities that every entry-level Django developer must perform in their workplace.
For 3-5 Years of Experienced Candidates
The following are the job responsibilities of middle-level Django developers.
For More Than 5 Years of Experienced Candidates
You can find the job responsibilities of senior-level Django developers below.
Good! The information you gathered in this section will help you prepare for Django interviews and clear your interviews easily.
Great! You have learned the crucial Django interview questions and answers from this blog in the best way. We hope this blog has elevated your confidence level to new heights so that you can boldly face Django interviews.
If you want to enhance your knowledge of the Django framework further, you can sign in for a Django training with MindMajix. This course will help you boost your skills in the Django framework to greater heights and ace your Django developer interviews effortlessly.
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Madhuri is a Senior Content Creator at MindMajix. She has written about a range of different topics on various technologies, which include, Splunk, Tensorflow, Selenium, and CEH. She spends most of her time researching on technology, and startups. Connect with her via LinkedIn and Twitter .