Django interview questions | Freshers & Experienced

Django follows model-template-view (MTV) architectural pattern.

Difference Between MVT & MVC

MVT: The full form of MVT is Model-View-Template.MVT has a similar approach to that of MVC. Unlike MVC, the MVT itself handles the controllers.

MVC: The full form of MVC is Model-View-Controller. The purpose of MVC is improving code scalability, reducing coupling between code blocks and decoupling.MVC helps the developers to change the visual part of the app and the business logic in a separate way.

Django has a "signal dispatcher" that helps support applications that are decoupled to get informed whenever actions take place elsewhere in a framework. In short, signals allow some senders to inform the set of receivers the action that has occurred. They’re especially beneficial when many parts of code may be involved in the same issues. Django renders a set of inbuilt signals that allows user code to get informed by Django itself of specific actions.

Mixins are in-built class-based views of Django render numerous functionalities but even then some of them can be needed to use separately. For example, a user wants to write a view such that it will provide a template to initiate an HTTP response, but the TemplateView can not be used, then the user will need to provide a template on POST only whereas GET would be doing something completely different. For this cause, Django also renders plenty of mixins that give added discrete functionality.

Class-based views in Django offers a different way to execute views like Python objects as a substitute for functions. It is known that views are callable, and it receives a request while returning a response. It permits you to structure the views and repeat the code by utilizing mixins and inheritance.

Hence, class-based views permit you to answer various HTTP request procedures with various class instance processes sans conditionally bifurcating code within a single or a targeted view function. However, Class-based views do not substitute function-based views although there are points of advantages and differences between function-based and Class-based views.

Django offers a suitable way to produce active HTML pages by the usage of its template methodology. A template comprises static fragments of the aspired HTML output along with few special syntaxes detailed with the instruction regarding the insertion of dynamic contents. Django templates utilize its possessed syntax to assign tags, variables, and expressions, etc. The templates are provided with contexts that are utilized to acquire merit at web pages. Thus, a Django template constitutes variables that in succeeding time can be restored by values when the template has been evaluated with tags that control the template’s logic.

Which is better?

Advantages of Django:

• Security features: When you use the Django framework, then you don't need to worry about any mistakes related to security. It provides some built-in features that help the developers in securing web applications from a plethora of threats. Some of the targeted security attacks are cross-site scripting, clickjacking, SQL injection, and cross-site request forgery.
• Batteries: Django is also known as "Batteries included framework". This means you don't need to write your code if it is prewritten, then you just need to do is import the package in your project. You may wonder but Django indeed comes with out of box stuff, that depends on you to use it or not.
• Written in Python: Since Django is written in Python., so it uses Python's popularity and power for itself. Developers can take advantage of syntax rules of Python to make the clean, readable and maintainable web applications. As Python is arguably one of the easiest languages, so it is easy to learn, so developers can curtail the development time from this.
• Scalable: Django has been growing constantly to help developers to build modern and fast web applications. The benefits of Django can be seen to meet the demand for heavy traffic. Therefore, the busiest sites use this framework to quickly meet traffic demands. Also, Developers can accelerate the development of complex web applications by wiring up the components.
• Compatibility: In today's world, users' access web applications on various platforms. So, it is expected that every framework supports modern operating systems. It is good to know that Django enhances the accessibility of web application on major operating systems like Windows, Linux, and macOS.
• ORM system: Moreover, Django’s ORM system makes easier for the developers to work with several widely used databases. Even, developers can use an ORM system to migrate from one database to another without writing additional code.
• Large Community: Django’s community is one of the best things, the experts are actively working on stabilizing the framework and making it more beginner-friendly. Along with that, documentation of Django is quite amazing, it will help you to use its various features as a primary source of information.

Disadvantages of Django:

• Depends heavily on ORM: Although the ORM system provided by Django enables developers to work with multiple databases. But it lacks some robust features which are provided by other widely used ORM systems. Along with that, the Python SQL toolkit-SQLAlchemy is not completely supported, so developers can’t take advantage of this.
• Multiple requests handling: Most frameworks have the feature to enable processes to handle multiple requests at a time. Unlike other frameworks, Django does not enable processes to handle multiple requests simultaneously. Therefore, developers have to put more efforts to make individual processes handle multiple requests simultaneously.
• Not good for small web applications: The Django additional features make easier for programmers to design complex web applications. But these advanced features don't work for small web applications, indeed, they decrease their performance. Hence, developers need to explore other ways to enhance the performance of small web applications.