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> By the way, defaultdict is NOT like setdefault--it is like get().
> Missing entries do no get set.
Why do you say that?
__missing__(...)
 __missing__(key) # Called by __getitem__ for missing key; pseudo-code:
 if self.default_factory is None: raise KeyError((key,))
 self[key] = value = self.default_factory()
 return value
In all cases of setdefault that I know of, replacing this with
a defaultdict would be appropriate. The only case where it wouldn't
work is if the default value depends on the key.
> What do you think?
If no speedup can be demonstrated, we should not change it.