Getting Started with Flask

Flask is a lightweight, extensible web framework that makes it simple to expose Python functionality over HTTP. Its flexible design lets you start with a single file application and then grow into a modular service.

Install Flask in your environment:

pip install flask

Build up your first web server in just a few lines of code:

from flask import Flask

app = Flask(__name__)

@app.route("/")
def hello_flask():
    return "Hello Flask!"

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)

Save this snippet as app.py, run flask --app app run --debug, and Flask will serve the "Hello Flask!" message to any user who visits the root URL.