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

python-oauthlib is installed in your system.

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

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

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

python-oauthlib package basic information: