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Tue Feb 21 02:46:06 CET 2006 · https://mail.python.org/pipermail/python-dev/2006-February/061555.html

On Feb 20, 2006, at 5:05 PM, Raymond Hettinger wrote:

> [Alex]
>>> I see d[k]+=1 as a substantial improvement -- conceptually more
>>> direct, "I've now seen one more k than I had seen before".
>
> [Guido]
>> Yes, I now agree. This means that I'm withdrawing proposal A (new
>> method) and championing only B (a subclass that implements
>> __getitem__() calling on_missing() and on_missing() defined in that
>> subclass as before, calling default_factory unless it's None). I  
>> don't
>> think this crisis is big enough to need *two* solutions, and this
>> example shows B's superiority over A.
>
> FWIW, I'm happy with the proposal and think it is a nice addition  
> to Py2.5.

OK, sounds great to me.  collections.defaultdict, then?

Alex

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[Python-Dev] defaultdict proposal round three