Interview Questions

Top Django Interview Questions and Answers 2020

 

If you are looking or switching for a job in Django rest framework and not sure about the Django interview questions which are asked in the interview for Python Django then These django interview questions for experienced will surely help you. GTec Vesu is providing you top Django interview questions and answers which will help you to crack your interview easily. This list includes django rest framework interview questions and django orm interview questions.

 

Top Django Rest Framework Interview Questions 2020

 

  1. What is Django?

Ans: 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.

 

  1. Name some companies that make use of Django?

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

 

  1. Which architectural pattern does Django Follow?

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

 

  1. Is Django a high-level web framework or low-level framework?

Ans: Django is a high-level Python’s web framework which was designed for rapid development and clean, realistic design.

 

  1. Mention the Django architecture?

Ans: Django architecture consists of

Models: It describes your database schema and your data structure

Views: It controls what a user sees, the view retrieves data from appropriate models and execute any calculation made to the data and pass it to the template

Templates: It determines how the user sees it. It describes how the data received from the views should be changed or formatted for display on the page

Controller: The Django framework and URL parsing

 

  1. Explain the use of session framework in Django?

Ans: In Django, the session framework enables you to store and retrieve arbitrary data on a per-site-visitor basis.  It stores data on the server side and abstracts the receiving and sending of cookies.  Session can be implemented through a piece of middleware.

 

  1. Explain how you can use file based sessions?

Ans: To use file based session you have to set the SESSION_ENGINE settings to “django.contrib.sessions.backends.file”

 

  1. What is a QuerySet in Django?

Ans: QuerySet is a collection of SQL queries. The command print(b.query) shows you the SQL query created from the Django filter call.

 

  1. What is the usage of Django-admin.py and manage.py?

Ans: Django-admin.py: It is a Django’s command line utility for administrative tasks.

Manage.py: It is an automatically created file 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.

It sets the DJANGO_SETTING_MODULE environment variable to points to your project’s setting.py file.

 

  1. What are the signals in Django?

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

 

  1. 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.

 

  1. What is Django Exception?

Ans: An exception is an abnormal event that leads to program failure. To deal with this situation, Django uses its exception classes and supports all core Python exceptions as well. Django core exceptions classes are defined in django.core.exceptions module.

 

  1. What is the usage of middlewares in Django?

Ans: Middlewares are used  go to modify the request i.e. HttpRequest object which is sent to the view, to modify the HttpResponse object returned from the view and to perform an operation before the view executes.

 

  1. Explain Mixins in Django ?

Ans: A mixin is a special kind of multiple inheritance. There are two main situations where mixins are used: to provide a lot of optional features for a class and to use one particular feature in a lot of different classes.

 

  1. What is the django.test.Client class used for?

Ans: The Client class acts like a dummy web browser, enabling users to test views and interact with Django-powered applications programmatically. This is especially useful when performing integration testing.

 

  1. What is a Meta Class in Django?

Ans: A Meta class is simply an inner class that provides metadata about the outer class in Django. It defines such things as available permissions, associated database table name, singular and plural versions of the name, etc.

 

  1. What does urls-config file contain?

Ans: The URLs-config in Django contains the list of urls and the mappings to view functions for those urls. The urls can map to view functions, Class-based views and urls-config of another application. All these methods have their use-cases.

For example – If we want to keep all the URLs of our application sorted, we will use the URL-config mapping. Inside urls file, we will use view function mapping and class-based views if we require some data from the user.

 

  1. What is a Meta Class in Django?

Ans: A Meta class is simply an inner class that provides metadata about the outer class in Django. It defines such things as available permissions, associated database table name, singular and plural versions of the name, etc.

 

  1. What is serialization in Django?

Ans: Serialization is the process of converting Django models into other formats such as XML, JSON, etc.

 

  1. What are migrations in Django?

Ans: A migration in Django is a Python file that contains changes we make to our models so that they can be converted into a database schema in our DBMS. So, instead of manually making changes to our database schema by writing queries in our DBMS shell, we can just make changes to our models. Then, we can use Django to generate migrations from those model changes and run those migrations to make changes to our database schema.