$ sudo apt-get update
$ sudo apt-get install python-quantumclient 

python-quantumclient is installed in your system.

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

$ sudo dpkg-query -l | grep python-quantumclient *

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

python-quantumclient package basic information: