[Python-ideas] defaultdict factory argument

[Zac Burns]

For one, it could be used to cache function calls.

I'm not sure how well defaultdict and WeakValueDictionary work
together (when combined/subclassed), but I can also imagine using a
class as the default_factory and using a defaultdict to return a new
instance of a class if none yet existed instantiated with the same
input parameters or returning the already existing one if one did
exist with those parameters.

--
Zachary Burns
(407)590-4814
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Production Engineer (Digital Overlord)
Zindagi Games



On Sat, Jan 17, 2009 at 5:44 PM, Chris Rebert <pyideas at rebertia.com> wrote:
> On Sat, Jan 17, 2009 at 5:35 PM, Zac Burns <zac256 at gmail.com> wrote:
>> I think defaultdict would be more useful if one could initialize it
>> with the option to have the key that is being looked up passed to
>> default_factory.
>
> While I don't disagree in principle, giving an example use-case would
> probably help.
>
> Cheers,
> Chris
>
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