# Flask 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. [WSGI]: https://wsgi.readthedocs.io/ [Werkzeug]: https://werkzeug.palletsprojects.com/ [Jinja]: https://jinja.palletsprojects.com/ ## A Simple Example ```python # save this as app.py from flask import Flask app = Flask(__name__) @app.route("/") def hello(): return "Hello, World!" ``` ``` $ flask run * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit) ``` ## Donate 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]. [please donate today]: https://palletsprojects.com/donate ## Contributing See our [detailed contributing documentation][contrib] for many ways to contribute, including reporting issues, requesting features, asking or answering questions, and making PRs. [contrib]: https://palletsprojects.com/contributing/ HEAD ## Contribution Note 5b51808f513ae28c87c9122a22e7e79b6f2ae3eb This change was added to demonstrate the GitHub fork and pull request collaboration workflow.