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.