Trying to understand how import works in python

[snippsat]

This is a example of how websocket work.
It's not the meaning that you should import,should run the server from command line.

λ python SimpleExampleServer.py --example echo

Now is the server running,open websocket.html.
There is a connect button.
Then send and get a response.

Output:
connected
sent: hello world
response: hello world