Martin v. Löwis <mar...@v.loewis.de> added the comment:
> 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.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5730>
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