$ sudo apt-get update
$ sudo apt-get install python-mod-pywebsocket 

python-mod-pywebsocket is installed in your system.

Make ensure the python-mod-pywebsocket package were installed using the commands given below,

$ sudo dpkg-query -l | grep python-mod-pywebsocket *

You will get with python-mod-pywebsocket package name, version, architecture and description in a table

python-mod-pywebsocket package basic information: