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

python-designateclient is installed in your system.

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

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

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

python-designateclient package basic information: