- ✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.
Flask is a lightweight WSGI web application framework for Python, often called a micro-framework because it provides only the essentials for web development, leaving developers free to choose additional tools as needed. It is built on Werkzeug (for request/response handling) and Jinja2 (for templating), making it both powerful and flexible.
Flask is ideal for RESTful APIs, microservices, and small-to-medium web applications. Unlike Django, it does not include an ORM or authentication by default, but supports extensions like Flask-SQLAlchemy, Flask-Login, and Flask-WTF for added functionality.
Basic Example:
from flask import Flaskapp = Flask(__name__)@app.route("/")def hello():return "Hello, World!"if __name__ == "__main__":app.run(debug=True)Copied!✕CopyHow it works:
Flask(__name__) creates the application instance.
@app.route("/") maps the root URL to the hello function.
app.run(debug=True) starts the development server with live reload.
Run it with:
python app.pyCopied!✕Copyor:
flask runCopied!✕CopyKey Features:
Flask Tutorial - GeeksforGeeks
Mar 7, 2026 · Quick introduction to Flask development, covering how to create and run a simple Flask application, understand routes and HTTP methods, work with variable rules, handle redirects and …
See results only from geeksforgeeks.orgIntroduction to Web development using Flask - GeeksforGeeks
Flask is a Python web framework used to build web applications and APIs. It is based on the WSGI (Web Server Gateway Interface) standard and uses the Jinja…
Welcome to Flask — Flask Documentation (3.1.x)
Learn how to create web applications with Flask, a Python framework that is easy to get started and scalable. Find installation instructions, tutorials, patterns, API …
Explore - Flask Tutorial
This tutorial covers everything from basics to advanced features of Flask, a web application framework written in Python. You need to have basic knowledge of …
How to Build Your First Flask Application (Step-by-Step Guide for ...
Nov 29, 2025 · If you're learning Python web development, building your first Flask app is the perfect starting point. This beginner-friendly guide will walk you through how to create, run, and understand …
Flask Tutorials - Real Python
Apr 24, 2020 · Explore Flask, a popular Python web framework, through these tutorials. Learn how to create web applications, integrate front-end frameworks, …
Flask Python Tutorial: A Comprehensive Guide - CodeRivers
Mar 17, 2025 · Whether you're creating a small personal project or a large-scale web application, Flask can serve as a solid foundation. This tutorial will take you through the fundamental concepts, usage …
Build a Flask Python Web App from Scratch | DigitalOcean
Nov 6, 2025 · Learn how to build a Flask web application from the ground up using Python, covering routes, templates, forms, and deployment.
Learn Flask for Python - Full Tutorial - YouTube
Watch full videoMay 28, 2019 · Flask is a micro web framework written in Python. It is classified as a microframework because it does not require particular tools or libraries. Learn how t...
- Author: freeCodeCamp.org
- Views: 2.3M
Flask Tutorial in Visual Studio Code
Python Flask tutorial showing IntelliSense, debugging, and code navigation support in Visual Studio Code, the best Python IDE.
Introduction to Web development using Flask
Mar 24, 2026 · Flask is a Python web framework used to build web applications and APIs. It is based on the WSGI (Web Server Gateway Interface) standard and uses …
- People also ask
Skip to content
Accessibility Feedback
