Open In App

Flask Tutorial

Last Updated : 03 Apr, 2024
Like Article

This Flask tutorial is the latest and comprehensive guide designed for beginners and professionals to learn Python Web Framework Flask, which is one of the most popular Python-based web frameworks. Whether you are a beginner or an experienced developer, this tutorial is specially designed to help you learn and master Flask and build your real-world web applications.

This Flask Tutorials covers a wide range of topics from basic concepts such as setup and installation to advanced concepts like user authentication, database integration, and deployment. In addition to this, we also provide you with a list of Flask with Python projects, FAQs, and interview questions for your future Interview.

Flask Tutorial

Flask Tutorial

Before you jump into this tutorial, it’s recommended to have a hands-on experience with HTML and Python. If you are not well aware of these concepts, then we will suggest you go through our tutorials on HTML and Python.

What is Flask?

Flask is a web framework that allows developers to build lightweight web applications quickly and easily with Flask Libraries. It was developed by Armin Ronacher, leader of the International Group of Python Enthusiasts(POCCO). It is basically based on the WSGI toolkit and Jinja2 templating engine.

Flask Setup & Installation

Welcome to the Flask tutorials section! Here, we’ll cover the essential elements you need to kickstart your journey in Flask. From installation and keywords to comments, variables, and indentation, we’ll explore the foundational concepts that underpin Python with Flask development.

Flask Quick Start

Welcome to Flask Quick Start – your go-to guide for mastering Flask development essentials in a snap! From crafting your inaugural application to fine-tuning HTTP methods, routes, and redirects, this concise yet comprehensive resource equips you with the skills needed to excel in Flask development.

Serve Templates and Static Files in Flask

Discover the essential techniques for serving templates and static files in Flask Web Framework with this comprehensive guide. From mastering Jinja2 templating and template inheritance to ensuring CSRF protection, uploading and managing files, and leveraging Flask Web Framework extensions like Flask-Mail and Flask WTF, this resource covers all you need to know to enhance your Flask web Framework applications.

User Registration, Login, and Logout in Flask

Master user authentication in Flask Web Framework with this concise guide. Learn registration, login, and logout functionalities using Flask-Login, implement password hashing with Bcrypt, manage sessions, and explore role-based access control. Additionally, discover tips for displaying the current username and handling JSON responses effortlessly.

Define and Access the Database in Flask

Delve into the world of database management in Flask with Python this guide. Explore powerful tools like Flask-SQLAlchemy for seamless integration with relational databases like SQLite and PostgreSQL. Learn to send data to MongoDB and execute raw SQL commands with Flask-SQLAlchemy.

Flask Deployment and Error Handling

Delve into Flask with Python deployment and error handling, covering subdomain management, 404 error handling, deploying Flask apps on Heroku, and incorporating machine learning models seamlessly.

Flask Projects

Explore a variety of Flask Web Framework projects, from a todo list app to sentiment analysis on Twitter, showcasing diverse functionalities such as portfolio creation, MySQL integration, and interactive data visualization with graphs and charts.

Must Read – Top 40 Flask Interview Questions and Answers

What is WSGI?

WSGI is an acronym for web server gateway interface which is a standard for Python web framework flask application development. It is considered the specification for the universal interface between the web server and web application.

What is Jinja2?

Jinja2 is a web template engine that combines a template with a certain data source to render dynamic web pages. In Easy Language, It combines a template (the layout of the page) with data (the specific information you want to show) to create a dynamic web page.

FAQs on Flask Tutorial

Q1. Should I learn HTML for Flask?


Both are highly recommended in case you are learning to develop web applications.

Q2. Is Flask open source?


Yes, Flask and Django both are Free Open Source, Python-based web frameworks that are used for building web applications.

Q3. How do I start a Flask project?


Here’s a simplified version of the steps to start a Flask project:

  1. Install Python.
  2. Install Flask by running “pip install flask” in the terminal or command prompt.
  3. Create a virtual environment by running “python -m venv myenv”.
  4. Activate the virtual environment by running “myenv\Scripts\activate.bat” on Windows or “source myenv/bin/activate” on macOS or Linux.
  5. Create a Flask app by importing Flask and creating a new instance of the Flask class.
  6. Define routes by decorating a function with “@app.route(‘/myurl’)” and defining the function to return data or HTML.
  7. Run the app by running “flask run” in the terminal or command prompt.

Q4. What is the default port of Flask?


By default, many Flask applications run on port 5000.

Q5. Which company uses Flask?


There are many major companies employing Flask and that list includes Netflix, Reddit, Airbnb, Lyft, Mozilla, MIT, Uber, Red Hat, Rackspace, Mailgun, Patreon, Samsung, NGINX, 2market, B2W, and Sieve.

Q6. What is the salary of a Flask Developer in India?


As per various resources, the average Salary of a Flask Developer was ranging between 9,00,000 INR – 11,00,000 INR depending upon the experience and skills.

Similar Reads

Documenting Flask Endpoint using Flask-Autodoc
Documentation of endpoints is an essential task in web development and being able to apply it in different frameworks is always a utility. This article discusses how endpoints in Flask can be decorated to generate good documentation of them using the Flask-Autodoc module. This module provides the following features - Helps to document endpoints of
4 min read
How to use Flask-Session in Python Flask ?
Flask Session - Flask-Session is an extension for Flask that supports Server-side Session to your application.The Session is the time between the client logs in to the server and logs out of the server.The data that is required to be saved in the Session is stored in a temporary directory on the server.The data in the Session is stored on the top o
4 min read
How to Integrate Flask-Admin and Flask-Login
In order to merge the admin and login pages, we can utilize a short form or any other login method that only requires the username and password. This is known as integrating the admin page and Flask login since it simply redirects users to the admin page when they log in. Let's is how to implement this in this article. Integrate Flask Admin and Fla
8 min read
Minify HTML in Flask using Flask-Minify
Flask offers HTML rendering as output, it is usually desired that the output HTML should be concise and it serves the purpose as well. In this article, we would display minification of output routes of Flask responses using the library - Flask-Minify. Advantages of MinificationWebsites load faster as fewer lines are there to upload and download.Ban
12 min read
Flask URL Helper Function - Flask url_for()
In this article, we are going to learn about the flask url_for() function of the flask URL helper in Python. Flask is a straightforward, speedy, scalable library, used for building, compact web applications. It is a micro framework, that presents developers, useful tools, and, features, for coding REST APIs, and backend data processing, of web apps
11 min read
Upload and Read Excel File in Flask
In this article, we will look at how to read an Excel file in Flask. We will use the Python Pandas library to parse this excel data as HTML to make our job easier. Pandas additionally depend on openpyxl library to process Excel file formats. Before we begin, make sure that you have installed both Flask and Pandas libraries along with the openpyxl d
3 min read
Python Flask - ImmutableMultiDict
MultiDict is a sub-class of Dictionary that can contain multiple values for the same key, unlike normal Dictionaries. It is used because some form elements have multiple values for the same key and it saves the multiple values of a key in form of a list. Example: C/C++ Code from werkzeug.datastructures import MultiDict orders = MultiDict([(1, 'GFG'
2 min read
Handling 404 Error in Flask
Prerequisite: Creating simple application in Flask A 404 Error is showed whenever a page is not found. Maybe the owner changed its URL and forgot to change the link or maybe they deleted the page itself. Every site needs a Custom Error page to avoid the user to see the default Ugly Error page. GeeksforGeeks also has a customized error page. If we t
4 min read
Python | Using for loop in Flask
Prerequisite: HTML Basics, Python Basics, Flask It is not possible to write front-end course every time user make changes in his/her profile. We use a template and it generates code according to the content. Flask is one of the web development frameworks written in Python. Through flask, a loop can be run in the HTML code using jinja template and a
3 min read
How to Build a Simple Android App with Flask Backend?
Flask is an API of Python that allows us to build up web applications. It was developed by Armin Ronacher. Flask’s framework is more explicit than Django’s framework and is also easier to learn because it has less base code to implement a simple web-Application. A Web-Application Framework or Web Framework is the collection of modules and libraries
8 min read
Article Tags :
Practice Tags :