[Python-Dev] caching in the stdlib?
Stefan Behnel
stefan_ml at behnel.de
Wed Jul 28 16:47:48 CEST 2010
I think this is better suited for python-ideas, so moving it there.
Guido van Rossum, 28.07.2010 16:31:
> On Tue, Jul 27, 2010 at 10:29 PM, Stefan Behnel wrote:
>> What about actually putting it visibly into the stdlib? Except for files, I
>> didn't see much about caching there, which seems like a missing battery to
>> me. Why not do it as with the collections module and add stuff as it comes
>> in?
>
> Caching is a rather large topic to focus on in a single stdlib module
> or package. It means radically different things to different people.
Sure. All I would like to see in the stdlib is a dict based cache with a
bounded size and a set of different policies that keep it at that size.
Maybe a BoundedDict would match that need.
> The pattern we're talking about there is probably more something like
> memoization, so 'memo' or 'memoization' could b a reasonable module
> name.
That would be a second interface to it, I'd say. The normal interface would
just be the regular mapping interface, maybe even just a .get() method
instead of a KeyError raising lookup.
> Maybe it could provide a decorator that you configure with
> things like how many entries max, the expiration policy (or different
> policies could have different decorators), and how to compute the memo
> key from the arguments to the function (the default could be the
> repr() of the argument tuple).
Absolutely.
Stefan
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