Tratto is a tiny framework I built to issue commands to cisco 
routers over ssh and telnet. I used pexpect.
Systems.py - Is a file that defines properties of different
operating systems
Connectivity.py - Is a file that defines connectivity objects
such as Session.
test.py - Example usages of how to use Tratto.
Examples - A Directory of real-world examples of tratto
 l3toPTR.py - A script that connects to a Cisco IOS device
 issues "sho ip int br" and generates dns names
 for the given l3 interface. This can be useful
 to generate ptr records for traceroutes. 
tratto is now a somewhat proper module, so you can import it like:
from tratto.systems import * etc...
Systems.OperatingSystems has been replaced with tratto.systems.SystemProfiles