pallets/flask

The Python micro framework for building 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.

Installing

Install and update using pip:

pip install -U Flask

A Simple Example

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.. code-block:: python

    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)

Contributing

For guidance on setting up a development environment and how to make a contribution to Flask, see the contributing guidelines.

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