Thank you very much for the interesting link!
No, there is no Python version of RevitLookup that I am aware of.
To install RevitLookup, you need to compile it, e.g. using Visual Studio or Visual Studio Express, to create a .NET DLL assembly.
With the .NET DLL assembly and the add-in manifest provided in the GitHub repository in hand, you install it like any other Revit add-in b copying the two into the appropriate Revit Add-Ins folder.
There are hundreds of tutorials on achieving that around.
The most accessible I am aware of are listed in the Revit API getting started material at
http://thebuildingcoder.typepad.com/blog/about-the-author.html#2