Has the addition of a Universe Set object ever been suggested. Like U = set(0), so that any object was a member of U? Maybe this gets into some crazy Cantorian stuff since U is in U. But it seems like it would be useful and would have a nice symmetry with emptyset:set([]), that is:
for any object a: "a in set([])" returns False "a in set(0)" returns True -- http://mail.python.org/mailman/listinfo/python-list
