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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 grown into one of the most popular Python web
frameworks in the world.
Flask provides a minimal core with no enforced project layout, allowing
developers to choose the tools and libraries they prefer. Its flexibility
makes it an excellent choice for both small projects and enterprise-grade
applications.
Why Flask?
- Minimal by design – no rigid structure, full freedom of choice.
- Scalable from small scripts to large applications.
- Extensible through a rich ecosystem of extensions.
- Backed by strong documentation and a large, active community.
A Simple Example
# 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 maintains Flask and its ecosystem.
To help grow the community and support long-term development,
please consider donating today.
Contributing
Flask welcomes all types of contributions, including:
- Reporting bugs or proposing improvements
- Discussing or suggesting features
- Improving the documentation
- Reviewing or submitting pull requests
To get started, see our contributing guide.