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

python-keystoneclient is installed in your system.

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

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

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

python-keystoneclient package basic information: