Getting Started With Tornado Web framework -Tutorial Savvy

“Tornado” is a Python based framework to create web applications.

Most important features of this framework are:-

   —Asynchronous I/O calls.
   —Web Sockets.
   —Maximum Polling .

In this Demo, “We will learn about installing the tornado site package with a simple program listing to a port”.

To install tornado framework use the PIP tool.Below screenshot shows the detailed command for installation of tornado framework,

Yo can verify the installation by checking the ‘site-packages‘ directory under python library.Below screenshot shows the installation path,

Let’ create a python project ‘TornadoWebAppDemo‘ and have a ‘main.py‘ python file as below,

The main.py file contains the below code,

import tornado.ioloop
import tornado.web
class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hi Sandeep, Welcome to Tornado Web Framework.")

if __name__ == "__main__":
    application = tornado.web.Application([
        (r"/", MainHandler),
    ])
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

About the above code:-

_main_ :
             –This is the main method where python start executing.Single point Entry for the program.
          tornado.web.Application :
   –This is the class which creates a base for web application taking a collection of handlers.
             –In this Demo “MainHandler” is the single handler mapped to root path.
listen(8888) :
   –Application listen to port 8888.Any client can communicate this application using this port .
          tornado.ioloop.IOLoop.instance().start():
             –IOLoop class is main event for the application.
             –Create a non blocking thread for an application.
             –It is singleton in nature.
           MainHandler:
             –It is handler for a request.
             — It refers to the current context using ‘self‘.
             — Returns the response using write() method.