pycairo ImportError: No module named gi.repository

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I am trying to open a JPG file with pycairo using the code I found at http://zetcode.com/gfx/pycairo/images/. The code imports modules from the gobject library:

from gi.repository import Gtk, Gdk, GdkPixbuf

I get the error:

ImportError: No module named gi.repository

I am using Python 2.7.3 on Windows XP. I installed gtk+-bundle_2.24.10-20120208_win32, pygtk-all-in-one-2.24.2.win32-py2.7, pycairo-1.8.10.win32-py2.7, and pygobject-2.28.3.win32-py2.7.

GTK+ has gobject-2.0.lib and supporting files, C:\Python2.7\Lib\site-packages\gtk-2.0\gobject has .py files, C:\Python2.7\Lib\site-packages\gtk-2.0\runtime\bin\ has libgobject-2.0-0.dll and various supporting files.

So what do I have to do to get python to import this?