A simple framework for building complex web applications.
Flask is a lightweight WSGI web application framework. It is designed to make getting started quick and easy, with the ability to scale up to complex applications. It began as a simple wrapper around Werkzeug and Jinja and has become one of the most popular Python web application frameworks.
Flask offers suggestions, but doesn’t enforce any dependencies or project layout. It is up to the developer to choose the tools and libraries they want to use. There are many extensions provided by the community that make adding new functionality easy.
Install and update using pip:
pip install -U Flask
A Simple Example
from flask import Flask app = Flask(__name__) @app.route("/") def hello(): return "Hello, World!"
$ env FLASK_APP=hello.py flask run * Serving Flask app "hello" * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
For guidance on setting up a development environment and how to make a contribution to Flask, see the contributing guidelines.
The Pallets organization develops and supports Flask and the libraries it uses. In order to grow the community of contributors and users, and allow the maintainers to devote more time to the projects, please donate today.
Release history Release notifications
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
|Filename, size||File type||Python version||Upload date||Hashes|
|Filename, size Flask-1.1.1-py2.py3-none-any.whl (94.5 kB)||File type Wheel||Python version py2.py3||Upload date||Hashes View hashes|
|Filename, size Flask-1.1.1.tar.gz (625.5 kB)||File type Source||Python version None||Upload date||Hashes View hashes|
Hashes for Flask-1.1.1-py2.py3-none-any.whl