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Django Interview Questions

Django is a great web development framework and is currently in high demand. You can get the job in the field of Django that you desire. This tutorial will help you to practice some Django interview questions along with answers, which are very important to showcase your understanding in an interview.

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Let’s see Django interview questions.

Q.1 What is Django? Explain some technical features.

Ans. Django is a high-level web application development framework based on Python. This framework is one of the best in the industry for rapid(i.e. fast) development, pragmatic design without compromising any feature.

Some of the technical features of Django are:

Admin Interface

Code Reusability

CDN Integration

Security Features

ORM

A huge number of third-party applications

Django community has been developing many features over the years and therefore it’s called “Batteries-Included” framework, as it has lots of features built-in which otherwise would be time-consuming and expensive to make.

 

Q.2 Explain Django Admin Interface?

Ans. The Django Admin interface is predefined interface made to fulfill the need of web developers as they won’t need to make another admin panel which is time-consuming and expensive.

Django Admin is application imported from django.contrib packages. It is operated by the organization itself and thus  doesn’t need the extensive frontend.

Admin interface of Django has its own user authentication and most of the general features. It also offers lots of advanced features like authorization access, managing different models, CMS (Content Management System), etc.

Q.3 Explain Django.

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

Q.4 What does Django mean?

Ans. Django Reinhardt, was a gypsy jazz guitarist from the 1930s to early 1950s who is known as one of the best guitarists of all time. The name was given Django after this person.

Q.5 Which architectural pattern does Django follow?

Ans. Django follows Model-View-Template (MVT) architectural pattern.

The graph below shows the MVT based control flow.

1

Request is made by the user for a resource to the Django, Django works as a controller and check to the available resource in URL.

When the mapping of URL is found , a view is called that interact with model and template, it renders a template.

After that Django responds back to the user and sends a template as a response.

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Q.6 Explain Django architecture.

Ans. Django follows MVT (Model View Template) pattern. It is slightly different from MVC.

Model: It is the data access layer. It contains everything about the data, i.e., how to access it, how to validate it, its behaviors and the relationships between the data.

Let’s see an example. We are creating  Employee model who has two fields first_name and last_name.

from django.db import models

class Employee(models.Model):

first_name = models.CharField(max_length=30)

last_name = models.CharField(max_length=30)

View: It is the business logic layer. This layer contains the logic that accesses the model and defers to the appropriate template. It is like a bridge between the model and the template.

import datetime

# Create your views here.

from django.http import HttpResponse

def index(request):

now = datetime.datetime.now()

html = “&lt;html&gt;&lt;body><h3>Now time is %s.</h3>&lt;/body&gt;&lt;/html>” % now

return HttpResponse(html)    # rendering the template in HttpResponse

Template: It is a presentation layer. This layer contains presentation-related decisions, i.e., how something should be displayed on a Web page or other type of document.

For the configuration of the templates, we have to provide some entries in settings.py file.

TEMPLATES = [

{

‘BACKEND’: ‘django.template.backends.django.DjangoTemplates’,

‘DIRS’: [os.path.join(BASE_DIR,’templates’)],

‘APP_DIRS’: True,

‘OPTIONS’: {

‘context_processors’: [

‘django.template.context_processors.debug’,

‘django.template.context_processors.request’,

‘django.contrib.auth.context_processors.auth’,

‘django.contrib.messages.context_processors.messages’,

],

},

},

]

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Q.7 Explain the working of Django?

Ans. Django can be broken into following components:

Models.py : Models.py  file will define your data model by extending your single line of code into full database tables and add a pre-built administration section to manage content.

Urls.py : Uses a regular expression to capture URL patterns for processing.

Views.py : This is main part of Django. The presentation logic is defined in this.

When a visitor visits  Django page, first Django checks the URLs pattern you have created and use this information to retrieve the view. Then it is the responsibility of view to processes the request, querying your database if necessary, and passes the requested information to a template.

Then template renders the data in a layout you have created and displayed the page.

Q.8 Name the foundation that manages the Django web framework?

Ans. Django is managed and maintained by an independent and non-profit organization named . Goal of foundation  is to promote, support, and advance the Django Web framework.

Q.9 Comment about  Django’s stability?

Ans. Django is quite stable web development framework.There are  many companies like Disqus, Instagram, Pinterest, and Mozilla that are using Django for many years.

Q.10 Specify the features available in Django web framework?

Ans. Features available in Django web framework are:

Admin Interface (CRUD)

Templating

Form handling

Internationalization

A Session, user management, role-based permissions

Object-relational mapping (ORM)

Testing Framework

Fantastic Documentation

Q.11 Explain the advantages of Django?

Ans. Advantages of Django:

Web development framework Django is a Python’s framework which is easy to learn.

It is clear and readable.

It is versatile.

It is fast to write.

No loopholes in design.

It is secure.

It is scalable.

It is versatile.

Q.12 What are the disadvantages of Django?

Ans. Following is the list of disadvantages of Django:

Django’ modules are bulky.

It is completely based on Django ORM.

Components are deployed together.

You must know the full system to work with it.

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Q.13 What are the inheritance styles in Django?

Ans. There are three possible inheritance styles in Django:

1) Abstract base class: In this only parent’s class to hold information that you don’t want to type out for each child model then this style is used.

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

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

Q.14 Is Django a CMS i.e. content management system?

Ans. No, Django is not a CMS. But, it is a Web framework and a programming tool that makes you able to build websites.

Q.15 Can you set up static files in Django? How?

Ans. Yes we can. We need to set three main things to set up static files in Django:

1) Set STATIC_ROOT in settings.py

2) run manage.py collect static

3) Static Files entry on the PythonAnywhere web tab

Q.16 What is some typical usage of middlewares in Django?

Ans. Some usage of middlewares in Django is:

Session management,

Use authentication

Cross-site request forgery protection

Content Gzipping

Q.17 What is the use of Django field class type?

Ans. Django field class type specifies:

The database column type.

Default HTML widget used to avail while rendering a form field.

The minimal validation requirements used in Django admin.

Automatic generated forms.

Q.18 Explain the use of Django-admin.py and manage.py?

Ans. admin.py: This is Django’s command line utility for administrative tasks.

Manage.py: This file is created automatically in each Django project. It is a thin wrapper around the Django-admin.py. It has the following usage:

It puts your project’s package on sys.path.

DJANGO_SETTING_MODULE is the environment variable used to points to your project’s setting.py file.

Q.19 What are the signals in Django?

Ans. Signals in Django are pieces of code which contain information about what is happening. A dispatcher is used to sending the signals and listen for those signals.

Q.20 What are the two important parameters in signals?

Ans. Two important parameters in signals are:

Receiver: It specifies the callback function which connected to the signal.

Sender: It specifies a particular sender from where a signal is received.

Q.21 How to handle URLs in Django?

In order to handle URL in Django, django.urls module is used by the Django framework.

Given below is the urls.py file of the project, lets see how it looks:

// urls.py

from django.contrib import admin

from django.urls import path

urlpatterns = [

path(‘admin/’, admin.site.urls),

]

We can see that,  Django  has already mentioned a URL here for the admin.  Function path takes the first argument as a route of string or regex type.

Argument view is a view function which is used to return a response (template) to the user.

Module django.urls contains various functions, path(route,view,kwargs,name) is one of those which is used to map the URL and call the specified view.

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Q.22 What is Django Session?

Ans. In Django session is a mechanism to store information on the server side during the interaction with the web application. Session stores in the database and also allows file-based and cache based sessions,  by default,

Q.23 Explainthe role of Cookie in Django?

Ans. Cookie is nothing but a small piece of information which is stored in the client browser. Cookies are used to store user’s data in a file permanently (or for the specified time). There is an  expiry date and time for each cookie and removes automatically when gets expire. There are built-in methods to set and fetch cookie provided by Django.

set_cookie() method is used to set a cookie and get() method is used to get the cookie.

request.COOKIES[‘key’] is an array which canbe used to get cookie values.

from django.shortcuts import render

from django.http import HttpResponse

def setcookie(request):

response = HttpResponse(“Cookie Set”)

response.set_cookie(‘java-tutorial’, ‘javatpoint.com’)

return response

def getcookie(request):

tutorial  = request.COOKIES[‘java-tutorial’]

return HttpResponse(“java tutorials @: “+  tutorial);

 

Author:
Nikita Jagtap | SevenMentor Pvt. Ltd.

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