Python Django Interview Questions And Answers
Hey! Looks like you are looking for the Python Django interview questions. You have landed in the right place. This article is best for individuals who are looking for job opportunities around Python along with Django. By the end of the article, you will gain an understanding of some of the important concepts and questions asked in the interviews. This article consists of the frequently asked python django interview questions that are curated by experts. Let’s get started now!
Q1) What do you know about the term Django? Briefly explain about some of the technical features that are available in Django.
Ans: Django is referred to as a high-level web application framework that is based on Python.
The Django framework is one of the best frameworks available in the industry which helps in the rapid development, pragmatic design without affecting or compromising on the features.
Few of the technical features of Django include the following:
- Admin Interface
- Security Features
- Code Reusability
- CDN Integration
A huge number of third-party applications
Apart from these, There are many features which the Django community has been developing since a few years and hence it is called “Batteries-Included” framework, as it has lots of features built-in within it. It is time-consuming and expensive to make if this framework was not developed.
Q2) How do you think that the Django’s code reusability features are different from other frameworks? Justify your answer.
Ans: Django framework is providing its extensive support to offer the feature of code-reusability more reliably when compared to the other frameworks available in the market. A Django Project is referred to as a collection of different applications that include the login application, signup application.These applications are allowed to be just copied from one directory to another with some tweaks or changes to settings.py file and it is not required to write new signup application from the beginning. This is the reason for which Django is considered as a rapid development framework and this level of code reusability is not available in any of the other frameworks.
Do you want to Master Python Django? Then enroll in "Python Django Training" This course will help you to master Python Django
Q3) Django is called as a MVC based framework, how does this framework implement MVC? Support your answer.
Ans: Django follows an MTV architecture which is considered to be a variant of MVC architecture. MVC stands for Model, View, and Controller. There will be different parts of a website so that the development and execution can take place in different machines in order to achieve faster and more responsive websites. Django makes use of the MTV architecture which consists of the three different components and they are all capable of being handled by Django itself.
Models are considered to be as the part in which includes models.py file in a Django application, which is used for defining the data structure of the application being developed.
Views are referred to as the mediators that exist between models and templates, they will be receiving the data from the Model and make it a dictionary and return the same as a response to the request placed to the Template.
The Template is referred to as the component with which the user will be interacting and it is capable of being generated in both statically and dynamically in the Django server.
Q4) Is Django’s Admin Interface considered customizable? If yes, then How?
Ans: Django’s Admin is referred to as one of the applications and very customizable, it also allows you to download a different third-party application and then install it for a totally different view. You are allowed to develop or create your own Admin Application if you would require complete control over the Admin. Although you are allowed to customize the Django Admin site which includes changing the properties of admin.site objects. You are also allowed to make some changes in particular models and apply the changes in the Django Admin for specific apps where we can add a search bar for particular applications. The Django Admin Interface is said to be fully customizable to the lowest level, but instead of customizing that much, it is recommended to rather create a new Admin Interface. So those who do not prefer Django Admin Interface can prefer making a new one from scratch than editing the previous one.
Q5) Explain the significance of using the settings.py file and what data/ settings it contains?
Ans: Whenever the Django server starts, it starts looking for settings.py. As the name settings, it is the main settings file of the web application. Everything inside your Django project includes a lot of things like databases, backend engines, middlewares, installed applications, main URL configurations, static file addresses, templating engines, allowed hosts and servers and security key stores in this file as a list or dictionary. Hence, whenever the Django server starts, it will be executing the settings.py file and then move on to the loading of the particular engines and databases so that when a request is given it can serve the same quickly.
Q6) Briefly explain about Django ORM?
Ans: Django ORM is referred to as one of the special feature-rich tools available in Django. ORM stands for Object-Relational Mapper. This ORM provides the ability to a developer to interact with a database in a pythonic way. Django ORM is referred to as the abstraction that exists between models (web application data-structure) and the database where the data is stored.
It makes it possible to perform the operations to retrieve, save, delete and perform other operations over the database without writing any SQL code. It also covers many loopholes and limitations and will be taking all the field attributes and provide you more control over your code in Python rather than any other database language.
Q7) List out the different advantages of using Django?
Ans: Below listed are the advantages of using Django:
- Django’s stack is known to be loosely coupled with a tight cohesion.
- Helps in the quick development of websites as and when required within the given deadlines.
- Follows the DRY or the Don’t Repeat Yourself Principle which means, one concept or a piece of data should live in just one single place
- It is Consistent at both low as well as high levels
- Capable of easily dropping into raw SQL whenever required
- SQL statements are optimized internally and are not executed many times.
- The Django apps utilize very less code.
- Behavior are explicitly specified.
- It is more flexible while using URLs.
Q8) what is the process to connect your Django project to the database?
Ans: Django has come up with a default database which is called SQLite. In order to connect your project to this database, you will need to use the following commands:
python manage.py migrate- migrate command is responsible for looking at the INSTALLED_APPS settings and creates database tables accordingly as required.
python manage.py makemigrations- it tells Django whenever you have created/ changed your models.
python manage.py sqlmigrate name of the app followed by the generated id> -sqlmigrate will take the migration names and return their SQL.
Q9) What are ‘views’?
Ans: The views in Django are capable of serving the purpose of encapsulation. They are capable of encapsulating the logic liable for processing the user’s request and for returning the response back to the user. Views in Django will either return an HttpResponse or will raise an exception such as Http404. HttpResponse includes the objects that consist of the content that is to be delivered or displayed to the user. Views are responsible for performing many different tasks which include reading the records from the database, delegate to the templates, generating a PDF file, etc.
Django Interview Questions For Experienced
Q10) What are ‘Models’?
Ans: Models are referred to as the single and definitive source for information about the data. It includes all the essential fields and behaviors of the data you have stored. Often, each model will be mapped to a single specific database table. In Django, models will serve as the abstraction layer which is used for structuring and manipulating the data. Django models are a subclass of the django.db.models. A Model class and the attributes in the models represent the fields in the database.
Q11) What are ‘templates’?
Ans: A Django’s template layer is used for rendering the information to be presented to the user in a designer-friendly format. Using these templates, you are allowed to generate HTML dynamically. The HTML includes both static as well as dynamic parts of the content. It is possible to have any number of templates based on the requirement of your project. It is also fine if none of them are included. Django has come up with its own template system called the Django template language (DTL). Regardless of the backend, you are also allowed to load and render templates by making use of Django's standard admin.
Q12) Briefly explain what are ‘signals’?
Ans: A Django comes up with a signal dispatcher that helps in allowing the decoupled applications to get notified whenever actions occur or take place elsewhere in the framework. Django has come up with a set of built-in signals that will allow the senders to notify a set of receivers when some action is executed or takes place.
Q13) What are static files?
Q14) What is the process of creating a Django project?
Ans: In order to create a Django project, cd into the directory where you would like to create the project and enter the following command:
django-admin startproject proj
NOTE: Here, proj is the name of the project. You can give any name that you wish to.
Q15) What do you understand by the term ‘sessions’?
Ans: Django provides its full support to sessions. Using the session framework, will help you to easily store and retrieve the arbitrary data that is based on the per-site-visitors. The session framework will basically data on the server-side and takes care of sending and receiving cookies. These cookies include a unique session ID but not do not include the actual data itself unless you explicitly use a cookie-based backend.
Q16) Briefly explain the use of Middlewares in Django.
Ans: By this time, you might have come across numerous Django Interview Questions, where this is one of the most frequently asked questions. Middleware is a framework that is a light and low-level plugin system which is used for altering the Django’s input and output globally. It is also considered as a framework of hooks into the request/ response processing of Django. Each and every component in middleware has some particular task to be performed. For example, AuthenticationMiddleware is used for associating with the users with their requests using sessions. Django is flexible to provide many other middlewares such as cache middleware which will enable site-wide cache, common middleware that allows to performs many tasks such as forbidding access to user agents, URL rewriting, etc, GZip middleware that is used for compressing the content for browsers, etc.
Q17) Is Django better than Flask?
Ans: Django is referred to as a framework that will allow you to build large projects. On the other hand, Flask is used for building smaller websites but flask is much easier to learn and use when compared to Django. Django is a full-fledged framework and does not require any third-party packages. The Flask is more of a lightweight framework that will allow you to install third-party tools as and how you like. Hence the ultimate answer is dependent on the user’s requirements and in case the requirement is very heavy, the answer will definitely be Django.
Q18) Give a brief idea about the different inheritance styles in Django?
Ans: There are three different inheritance styles in Django:
1) Abstract base classes: The abstract base class style is used when you only require a parent's class to hold the information that you would not like to type out for each child model.
2) Multi-table Inheritance: The multi-table inheritance style is used if you are subclassing an existing model and will need each model to have its own database table.
3) Proxy models: The proxy model style is used, if you would like to modify the Python level behavior of the model, without changing the model's fields.
Q19) What are the two important parameters in signals?
Ans: There are two important parameters in signals. They are:
Receiver: It specifies the callback function which is connected to the signal.
Sender: It specifies a particular sender from where a signal is being received.
Django Developer Interview Questions
Q20) What is meant by the Django Exception?
Ans: An exception is referred to as an abnormal event that will be leading to program failure. In order to deal with this scenario, Django utilizes the exception classes and provides its support for all core Python exceptions as well. Django core exceptions classes are defined in the module django.core.exceptions.
Q21) Briefly explain about the role of Cookie in Django?
Ans: A cookie is referred to as a small piece of information which is particularly stored in the client browser. It is used for storing the user's data in a file permanently (or for the specified time). Cookie will have its expiry date and time and removes automatically when it expires. Django also includes the built-in methods to set and fetch cookies. The set_cookie() method is used for setting up a cookie and get() method is used to get the cookie. The request.COOKIES['key'] array can also be used to get cookie values.
Q22) Do you think is it mandatory to use the model/ database layer?
Ans: No, it is not mandatory to use the model/ database layer. The model/ database layer is actually decoupled from the rest of the framework.
Q23) Does Django provide its support for multiple-column Primary Keys?
Ans: No. Django is capable of providing its support only for the single-column Primary Keys.
Q24) Is Django a CMS?
Ans: Django is not a CMS (content-management-system) . It is just a Web framework, a tool that allows you to build websites.
Q25) List out some of the companies that use Django?
Ans: Some of the more well-known companies that use Django include:’
- Mozilla Firefox
Q26) List out the different caching strategies that are supported by Django.
Ans: Django provides its support for these caching strategies:
- Database caching
- In-memory caching
- File System Caching
Q27) Briefly explain what the Django field class types contain?
Ans: Field class types determine
The database column type
The default HTML widget that has to be availed while rendering a form field
The minimal validation requirements are required in Django admin and in automatically generated forms.
Q28) What is meant by serialization in Django?
Ans: Serialization is referred to as the process of converting Django models into other formats such as XML, JSON, etc.
As you know that is a high demand for developing the applications as the customers are expecting new evolvements and enhancements. Business organizations are keeping up their efforts by ensuring that they are choosing the right language for the implementation of their projects or developments. Hence, looking for individuals who are expertized or knowledgeable has become common these days. And I know you are trying to crack the interview and grab one of the positions. These interview questions will definitely help you in cracking the interview. I wish you all the best for the interview and also for your future endeavors.