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Basic Tornado Application

May 19, 2024, 2 min read

Tornado is a Python Web Framework. When I was learning web development, this was my go to back-end library. Below are all the notes I have on my web learnings.

Folder structure

root folder

  • static
  • templates
    • index.html
    • template.html
  • app.py

App.py

This is the python back-end code

# Webserver stuff
import tornado.ioloop
import tornado.web
 
# route to index.html
class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.render('templates/index.html') 
 
# r"/" == root website address
application = tornado.web.Application([
    (r"/", MainHandler)
],debug=True) 
 
# Start the server at port n
if __name__ == "__main__":
    PortNumber = str(7777)
    print(r'Server Running at http://localhost:' + PortNumber + r'/')
    print(r'To close press ctrl + c')
    application.listen(PortNumber)
    tornado.ioloop.IOLoop.instance().start()

Front-end code

The idea is to create a base html file named template.html and then build all other html files on top of the template. This made the html files much cleaner an easier to maintain.

template.html

<!DOCTYPE html>
<head>
  <title>Tornado</title>
</head>
<body>
 
 
    {% block content %}
    {% end block %}
 
	
</body>
</html>

index.html

Extends will import the template.html file and replace the block content with the header/paragraph section in the body.

{% extends "template.html" %}
{% block content %}
 
		<h2>Welcome to Tornado</h2>
		<br>
		<p>This is the index page</p>
 
{% end block %}

Here is how you run the application:

python app.py

Here is how the front-end looks like:

Here is how the back-end looks like:

Graph View

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