Python Tornado - part 001.

Python Tornado is a high‑performance web framework and asynchronous networking library designed for extreme scalability and real‑time applications. Its standout capability is handling tens of thousands of simultaneous connections efficiently, thanks to non‑blocking I/O.

This is an open source project actively maintained and available on tornadoweb.org.

Python Tornado – Key Capabilities

• Massive Concurrency: Tornado can scale to tens of thousands of open connections without requiring huge numbers of threads.
• Non‑blocking I/O: Its asynchronous design makes it ideal for apps that need to stay responsive under heavy load.
• WebSockets Support: Built‑in support for WebSockets enables real‑time communication between clients and servers.
• Long‑lived Connections: Perfect for long polling, streaming, or chat applications where connections remain open for extended periods.
• Coroutines & Async/Await: Tornado integrates tightly with Python’s asyncio, allowing developers to write clean asynchronous code using coroutines.
• Versatile Use Cases: Beyond web apps, Tornado can act as an HTTP client/server, handle background tasks, or integrate with other services.

Tornado setup: The script creates a web server using the Tornado framework, listening on port 8888.

Route definition: A single route /form is registered, handled by the FormHandler class.

GET request: When you visit http://localhost:8888/form, the server responds with an HTML page (form.html) that contains a simple input form.

POST request: When the form is submitted, the post() method retrieves the value of the name field using self.get_argument("name").

Response: The server then sends back a personalized message

Let's see the script:

import tornado.ioloop
import tornado.web
import os

class FormHandler(tornado.web.RequestHandler):
    def get(self):
        self.render("form.html")  # Render an HTML form

    def post(self):
        name = self.get_argument("name")
        self.write(f"Hello, {name}!")

def make_app():
    return tornado.web.Application([
        (r"/form", FormHandler),
    ],
    template_path=os.path.join(os.path.dirname(__file__), "templates")  # <-- aici
    )

if __name__ == "__main__":
    app = make_app()
    app.listen(8888)
    print("Server pornit pe http://localhost:8888/form")
    tornado.ioloop.IOLoop.current().start()