[Python-Dev] defaultdict proposal round three (original) (raw)

Raymond Hettinger python at rcn.com
Tue Feb 21 02:05:33 CET 2006

[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 onmissing() and onmissing() defined in that subclass as before, calling defaultfactory 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.

Raymond

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