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Flask is a lightweightWSGI web application framework. It is designedto make getting started quick and easy, with the ability to scale up tocomplex applications. It began as a simple wrapper aroundWerkzeugandJinja, and has become one of the most popular Python webapplication frameworks.

Flask offers suggestions, but doesn't enforce any dependencies orproject layout. It is up to the developer to choose the tools andlibraries they want to use. There are many extensions provided by thecommunity that make adding new functionality easy.

# save this as app.pyfromflaskimportFlaskapp=Flask(__name__)@app.route("/")defhello():return"Hello, World!"

$ flask run  * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

The Pallets organization develops and supports Flask and the librariesit uses. In order to grow the community of contributors and users, andallow the maintainers to devote more time to the projects,pleasedonate today.

See ourdetailed contributing documentation for many ways tocontribute, including reporting issues, requesting features, asking or answeringquestions, and making PRs.