[Python-ideas] Better support for finalization with weakrefs
shibturn at gmail.com
Wed Aug 1 18:27:23 CEST 2012
On 01/08/2012 4:41pm, Lefavor, Matthew (GSFC-582.0)[MICROTEL LLC] wrote:
> If finalizations are objects, is there any reason you can't make the
> finalization object have an unregister method, like below? Or does this
> not address the problem?
> >>> class Kenny: pass
> >>> kenny = Kenny()
> >>> f = finalize(kenny, print, "you killed kenny!")
> >>> f
> <finalize.finalize object at 0xffed4f2c>
> >>> f.unregister()
> >>> del kenny
> Matthew Lefavor
I have a patch (with tests and docs) at
It has a pop() method for unregistering the callback.
So if f was created using
f = finalize(obj, func, *args, **kwds)
then f.pop() returns a tuple
(wr, func, args, kwds)
where wr is a weakref to obj.
There is also a get() method which returns the same info, but does
not unregister the callback.
Once the finalizer is dead, f(), f.get(), f.pop() all return None.
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