I finally found it. He is buried in a Macports package called gnome-python-desktop :
$ sudo port install gnome-python-desktop
All that I can find suggests that it is not available anywhere else. Both this and this page say that it is wrapped in GNOME Desktop and is not standalone. The same goes for Linux (in Ubuntu, the package name is python-gnome2-desktop ). There is a package on GitHub that looks a bit lighter, but it is only for Windows.
I also found something else alarming: this module has not been updated since 2005 . Therefore, if possible, it would be better to stay away from him.: - /
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