[Python-Dev] weakref enhancements
rhettinger at ewtllc.com
Thu Sep 28 21:02:20 CEST 2006
tomer filiba wrote:
> i'd like to suggest adding weak attributes and weak methods to the std
. . .
> i think these two features are quite useful, and being part of the
> stdlib, would
> provide programmers with easy-to-use solutions to object-aliveness issues.
> more info, examples, and suggested implementation:
> * http://sebulba.wikispaces.com/recipe+weakattr
> * http://sebulba.wikispaces.com/recipe+weakmethod
I'm sceptical that these would find use in practice. The cited links
have only toy examples and as motivation reference Greg Ewing's posting
saying only "I'm thinking it would be nice . . . This could probably be
done fairly easily with a property descriptor."
Also, I question the utility of maintaining a weakref to a method or
attribute instead of holding one for the object or class. As long as
the enclosing object or class lives, so too will their methods and
attributes. So what is the point of a tighter weakref granualarity?
So, before being entertained for addition to the standard library, this
idea should probably first be posted as an ASPN recipe, then we can see
if any use cases emerge in actual practice. Then we could look at
sample code fragments to see if any real-world code is actually improved
with the new toys. My bet is that very few will emerge, that most would
be better served by a simple decorator, and that an expanding weakref
zoo will only making the module more difficult to learn.
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