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

python-restrictedpython is installed in your system.

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

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

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

python-restrictedpython package basic information: