$ sudo apt-get update
$ sudo apt-get install python-sockjs-tornado 

python-sockjs-tornado is installed in your system.

Make ensure the python-sockjs-tornado package were installed using the commands given below,

$ sudo dpkg-query -l | grep python-sockjs-tornado *

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

python-sockjs-tornado package basic information: