What is py2geom
it is a python lib that provides 2geom functionality. in other words: python bindings to 2geom. it has not been released in binaries yet, so you have to build them yourself from source or read on below...
Johan built them for you and packaged them in a 7zip file: ...
You have to unpack the 7z file into "Lib\site-packages\" whereever you have python installed. For example: "C:\Python26\Lib\site-packages", so you get "C:\Python26\Lib\site-packages\py2geom\..." with the files in it.