Installation for Pyhon 3.5 succeeds, launching PyGobject fails.

I successfully install pygobject for windows using the PATH and finding the installation. However when launching python, I cannot import gi or anything from it (module not found).

I would like to know what's the import process supposed to do since there is absolutely no gi package installed, even less an __init__ file.

Please if it's a specific manipulation to do, update the readme to have launching instructions. Else here is some relevant data:

Python install directory : D:\w81.64\Python35
Python path is in %PATH% : True
Python found in registry : False
"gi" in sys.modules : False
Failure is at finding the modules, echo finder of sys.meta_path fails to locate the module. They are four : the builtin-in module finder, the frozen module finder, the registry module finder and the "path" module finder.

Note: I tried on another computer, using normal install and portable install over a virtual env, and it always failed the same way.