Flask Python is one of the newest frameworks of Python and is used for designing web applications. It comes with powerful features like built-in development server, integrated support for unit testing, RESTful request dispatching, Jinja2 templating and Unicode based. In this article we have listed some frequently asked Python Flask Interview Questions
Below are few basic Python Flask interview Questions
Q1. What is Python Flask?
Python Flask is a Web framework. It means flask provides you tools,libraries and technologies that allow you to build a web application. In this web application can be some web pages, a blog, a wiki or go as big as a web-based calendar or a commercial website
Q2. How can you redirect to a url in python flask?
Flask class has a redirect() function. When called, it returns a response object and redirects the user to another target location with specified status code.
Prototype of redirect() function is as below −
Flask.redirect(location, statuscode, response)
Q3. What are the features of Flask Python?
Flask is a python framework, it's based on werkzeug, Jinja2 and inspired by Sinatra Ruby framework, it was developed at pocoo by Armin Ronacher. Although Flask is rather young compared to most python frameworks. Here are some features of Flask Python-
- Built-in development server and fast debugger
- Unicode based
- WSGI 1.0 compliant
- Support for secure cookies (client side sessions)
- Jinja2 templating
- RESTful request dispatching
- integrated support for unit testing
Q4. What is the benefit of using flask?
Benefit Of Using Flask
Flask is a "microframework" primarily build for a small application with simpler requirments. Flask is part of the micro-framwork. which means it will have little to no dependencies no external libraries, framework light while there is little dependency to update and less security bugs.
Q5. What is Flask-WTF and what are their features?
There are some features of Flask-WTF, Flask-WTF offers simple integration with WTForms.
- File upload that works with Flask Uploads
- Recaptcha supporting
- Integration with wtforms
- Secure form with csrf token
- Global csrf protection
- Internationalization integration
Q6. How we can a request context be created in Flask Python?
We can a request context be created in Flask Python, when the Flask Application handles a request, it creates a Request object based on the environment it received from the WSGI server. Because a worker (thread, process, or coroutine depending on the server) handles only one request at a time, the request data can be considered global to that worker during that request. As we know created be context Flask automatically pushes a request context when handling a request. View functions, error handlers, and other functions that run during a request will have access to the request proxy, which points to the request object for the current request.
Q7. What do you mean by a decorator? in flask python?
Decorator is Big part of Python features. while seemingly confused at first, it is really just a function that takes another function as parameter and return another function. This is possible because in Python, function is a first-class citizen, meaning that function can be used as a parameter, a return value and can be assigned to variable.
Q8. What is flask framework used for in Python? How is it different from Django and difine similarities ?
Flask framework used for in Python :-
Flask is considered more Pythonic than the Django web framework because in common situations the equivalent Flask web application is more explicit. Flask is also easy to get started with as a beginner because there is little boilerplate code for getting a simple app up and running.
There are some differences and similarities of the frameworks.
For the differences;
1.Django is a “batteries-included” framework; it is very powerful and feature-rich out of the box ( no extra libraries/modules are needed ). Flask, as it calls itself, is a “microframework”; it comes with the very very basic minimum required stuff to get a web app up and running as fast as possible.
- Djano requires a lot of configuration ( people might argue here ) but we can all agree it requires more configuration than Flask does ( even with external libraries ).
Similarities of the frameworks;
- Dianjo and Flask are both written in Python (duh)
- They are both web frameworks ( used to create web apps with Python )
- They both have very good communities supporting them and a very good documentation.
Q9. Tell Some few words about Flask Server?
Flask’s framework is more explicit than Django’s framework and is also easier to learn because it have less base code to implement a simple web-Application. It was developed by Armin Ronacher.A Web-Application Framework or Web Framework is the collection of modules and libraries that helps the developer to write applications without writing the low-level codes such as protocols, thread management, etc.
Q10. Difference between python flask vs django.
Both Django vs Flask are web frameworks for Python. Django, on one hand, provides a full-featured Model-View-Controller Framework, flask, on the other hand, is a micro-framework which beliefs in the concept of doing one thing and do it well. It does not provide an ORM. Flask comes up with the basic set of tools for authorization or a third-party plugin such as Flask HTTP-Auth. Flask doesn’t need any specific libraries or tools. Flask community provides an ORM a rich set of extensions to match its capabilities with that of Django. Django is a full-stack web framework for Python, whereas Flask is a lightweight and extensible Python web framework. Django is developed based on batteries-included approach. It enables programmers to accomplish common web development tasks without using third-party tools and libraries.
Q11. What is the Difference Django and Flask Table?
There are some Difference between Django vs Flask Table,
): Django Structure:-
Django is a Python-based free, open source framework which follows the MVC (model view controller) approach of architectural pattern
): Flask Structure:-
Flask is a Python-based micro framework without any set of particular tools or external libraries. It also doesn’t have a database layer or provisions for form validation and makes use of extensions.
): Django Features:- Components:-
- Object-relational mapper
- View- web templating system
- Serialization
- Middleware classes support , Etc,,,,
): Bundled Applications
- Built-in mitigation
- Atom and RSS syndication feeds
- Admin interface
- Authentication system
): Flask Features
- Development debugger
- Inbuilt support for unit testing
- Jinja2 templates
- RESTful request dispatch
- Support for secure cookies
- Full WSGI compliant
- Extensive documentation
- Unicode based
- Google app based engine compatibility
- Extensions for desired features
- Modular and a lightweight design
- ORM- agnostic
- High flexibility
- Development server
): Django Sites using these frameworks,
Public Broadcasting Service, Mozilla, Instagram, The Washington Times, BitBucket, Disqus, Nextdoor.
): Flask Sites using these frameworks,
Pinterest, LinkedIn, and Flask community in it self
): Django Project Layout,
Conventional project structure
): Flask Project Layout
Arbitrary structure
): Django Flexibility
Doesn’t exclude setting flexibility
): Flask Flexibility
It is believed that all the possible permutations to organize a Flask code equals the applications number present in flask already
Q12. Why we use Flask?
We use Flask because in common situations the equivalent Flask web application is more explicit. Flask is considered more Pythonic than the Django web framework Flask is also easy to get started with as a beginner because there is little boilerplate code for getting a simple app up and running.
Thanks for reading above interview questions and answers on Python Flask. If you have any new link or questions about Python Flask interview then you can add it here: 20 Best Python Flask Interview Questions Preparation Resources