Message166002
In the documentation on weakrefs there is the following quote
Note: Weak references to an object are cleared before the object’s
__del__() is called, to ensure that the weak reference callback
(if any) finds the object still alive.
But I think the weakref is always dead by the time the callback is invoked. The first paragraph from the documentation for weakref.ref(object[, callback]) contains the following:
If callback is provided and not None, and the returned weakref
object is still alive, the callback will be called when the object
is about to be finalized; the weak reference object will be passed
as the only parameter to the callback; **the referent will no longer
be available**.
Which does prompt a question: what use is there for the weakref argument to the callback if it already dead?
(Compare http://bugs.python.org/issue14933) |
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Date |
User |
Action |
Args |
2012-07-21 09:41:58 | sbt | set | recipients:
+ sbt, pitrou, docs@python |
2012-07-21 09:41:58 | sbt | set | messageid: <1342863718.26.0.49587627068.issue15412@psf.upfronthosting.co.za> |
2012-07-21 09:41:57 | sbt | link | issue15412 messages |
2012-07-21 09:41:56 | sbt | create | |
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