>>> stuff = (1,2,3,4,3,4,5,6,45,6,7,8,9,5,6)
>>> dict.fromkeys(stuff).keys()
[1, 2, 3, 4, 5, 6, 7, 8, 9, 45]

Sets are available in 2.3, by the way, just as a library module instead of a builtin. But you knew that. But not everyone does. ;)