The python documentation states that since python 2.0 __getslice__ is
obsoleted by __getitem__. However, testing with python 2.3 as well as
2.5, I find the following surprising behavior:

class Tuple(tuple):

  def __getitem__(self, i): print '__getitem__', i
  def __getslice__(self, i): print '__getslice__', i

t = Tuple()
t[0] # __getitem__ called with type(i) == int
t[0:2] # __getslice__ called with type(i) == slice
t[0:2:1] # __getitem__ called with type(i) == slice