Tim pointed out a remaining vulnerability in popitem(): the

PyTuple_New() could *conceivably* clear the dict, so move the test for
an empty dict after the tuple allocation.  It means that we waste time
allocating and deallocating a 2-tuple when the dict is empty, but who
cares.  It also means that when the dict is empty *and* there's no
memory to allocate a 2-tuple, we raise MemoryError, not KeyError --
but that may actually a good idea: if there's no room for a lousy
2-tuple, what are the chances that there's room for a KeyError
instance?

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