PyGObject in Python 3 on windows
Since this is the most rated question in the topic, I'd like to update the answer. Here is available installer for windows 32bit:
It contain complete SDK-like package. And complete libraries collection too. http://sourceforge.net/projects/pygobjectwin32/files/pygi-aio-3.10.2-win32_rev10-setup.exe/download
I searched for the same thing not so long ago. I couldn't really find much information but this other post
I ended up giving up on GTK+ and switch to xwpython which is really os independant
did you try the offical pypi page https://pygobject.readthedocs.io/en/latest/getting_started.html
I was able to install GTK