Python Flask Interview Questions For Freshers & Experienced

  • Question 1) What is Python Flask?
  • Question 2) For what python flask is used?
  • Question 3) How to structure python flask project?
  • Question 4) How to install python flask?
  • Question 5) How to start python flask app?
  • Question 6) What is g in python flask?
  • Question 7) How to check version of python flask?
  • Question 8) Enlist few alternatives of python flask?
  • Question 9) What is app routing in Python flask?
  • Question 10) How to enable logging in python flask?
  • Question 11) How to redirect to a url in python flask?
  • Question 12) What are python flask query parameters?
  • Question 13) How to get all records for table in Flask?
  • Sharad Jaiswal
  • 21st Dec, 2019
  • 314 Followers

Python Flask Interview Questions
Updated ON

21st Dec, 2019

No. of Questions

15

Posted In

Python

Author

Sharad Jaiswal

What is Python Flask?

Python Flask is one of the most lightweight WSGI frameworks in Python web applications. Python Flask is designed to quickly start and scale-up applications that are complex in nature. It only offers suggestions in place of enforcing any dependencies or layout of the project. The developers can choose the required libraries and tools they want to use in Python Flask. Many extensions are present in it that makes functionality easy.

Flask is an integral part of the micro-framework. The advantages of implying python Flask are that it watches out for security bugs, communication with the webserver and can be employed outside CGI.

Key Features of Python Flask

Below are few major features of Python Flask

Built-in development server

Jinja2 templating

Support for unit testing

Based on Unicode

Secure cookies

Easy Session Management

URL routing

WSGI compliance

RESTful request dispatching

Python Flask Interview Questions

Q1. What is Python Flask?

Python Flask is popular, extensible micro web framework written building web applications using Python Programming Language. This does not require particular tools or libraries and does not have database abstraction layer, form validation, or any other components.

Q2. For what python flask is used?

You can use python flask framework for creating API's, blog or wiki-like platform.

Q3. How to structure python flask project?

A Single Flask module in the project is structured as below

app.py
config.py
requirements.txt
static/
templates/

Q4. How to install python flask?

You can use the below command to install Python Flask.

pip install Flask

Q5. How to start python flask app?

A simple Flask application looks like below

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

You can start python flask app by running below command

$ export FLASK_APP=hello.py
$ flask run
 * Running on http://127.0.0.1:5000/

Q6. What is g in python flask?

Flask g name stands for "global" which is referring to data being global within a context. The data saved in g is lost after the context ends, and it is not an appropriate place to store data between requests.

Q7. How to check version of python flask?

Run below command to check the installed version of the python flask

>> import flask
>> flask.__version__

Q8. Enlist few alternatives of python flask?

Django, Sinatra, Pyramid, Falcon framework, Bottle, jam-py are some good alternatives to Python Flask.

Q9. What is app routing in Python flask?

App routing in Flask is used to map a specific URL with the associated function that is intended to perform some task.

Q10. How to enable logging in python flask?

Set app.debug to True and add below code in your function where you want to enable logging in Flask.

import logging
from flask import Flask
app = Flask(__name__)

@app.route('/') def foo(): app.logger.warning('A warning occurred') app.logger.error('An error occurred') app.logger.info('Info') return "foo"

Q11. How to redirect to a url in python flask?

You can use redirect() to redirect to a URL in python flask.

Example:

return redirect("http://www.example.com", code=301)

Q12. What are python flask query parameters?

Query Parameter also known as query strings in Python Flask are post or get data that is send to the server via form or ajax method. You can use request.args.get('query_name') function to get a query string in Flask Framework.

Q13. How to get all records for table in Flask?

You can use Model.query.all() method to get all records for the table in Flask.

Example

@app.route('/users')
def users():
    users = User.query.all()  

Q14. How to return json in flask?

Use jsonify() function to return json in flask.

Example

from flask import jsonify
@app.route('/users')
def users():
   users= User.query.all()  
    return jsonify(users)

Q15. What are macros in python flask?

Flask macro is a tool to build modular user interface on web pages.

About Author :

  • Author of Python Flask Interview Questions

    Sharad Jaiswal

    Sharad Jaiswal is Sr. Web Developer from Noida area. He have rich experience in PHP, Angular Js, React, javascript and Node .If you any query or project on these programming you can drop your enquiry in comment section.

1 comment(s) :

  •   Reply
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    Shivasai T

    22nd Dec, 2019

    "Just like I know you have experience of 5 to 4 years, so in the same way, you have all the new update questions of Python Flask, very nice to know, Thank You Developer,

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