Tornado Python

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  • Tornado is a Python web framework and asynchronous network library, originally developed at FriendFreed. Tornado uses non-blocking network-io. Due to this, it can handle thousands of active server connections. It is a saviour for applications where long polling.
  • Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.

Tornado is a Python web framework and asynchronous networking library, that uses non-blocking network I/O which allows it to scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.

Tornado is a Python web framework and asynchronous networking library. You can write Tornado web apps on PythonAnywhere, but you won't be able to use all of Tornado's features.

Tornado python docker

PythonAnywhere web applications are connected to clients (ie. users' web browsers) using a protocol called WSGI. WSGI is designed for traditional web apps, where the client makes a request to the server for a specific resource, and is given the resource. Each request for a new page (or image, or other file) is made in a different request, and there is no way for the server to push data to the client.

Tornado, however, is optimised for asynchronous communication with client web browsers -- that is, a client opens a connection, but then the connection is kept open and the server can push data back to the client. This doesn't work with WSGI, so it doesn't work on PythonAnywhere.

However, if you're using Tornado as a web framework and don't care about the asynchronous stuff, you can use it on PythonAnywhere. Here's a step-by-step guide:

Github tornado

Tornado Python Post

  • Go to the 'Web' tab
  • Create a new web app, using the 'Manual configuration' option.
  • Edit the WSGI file (there should be a link when you get the 'All done' message on the web tab)
  • Replace the code in the WSGI file with this:

Visit your app, and you should get the results you expect.

Python

Tornado Python Github

For more information about Tornado and WSGI, check out this page in the Tornado docs. One thing to keep an eye out for -- in their example, they create a WSGI server to serve up the Tornado app:

Tornado Python Github

Don't do that on PythonAnywhere -- it will break your web app completely.