I got bit by this when I did a dist-upgrade today, and didn't notice that lots of gnome stuff was getting automatically uninstalled. Was able to re-install python-gnome2 and then basic gnome things after manually installing python-gnome2 with dpkg --force-all, and then editing /var/lib/dpkg/status to remove the dependency on python2.6-gtk2 for python-gnome2. (Or something like that--I'm no longer sure I did it in that exact order.) The strange thing is that on the Debian packages page for python-gnome2, this dependency doesn't appear, but my dpkg system did register it. Hope this helps.
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