New submission from Richard Oudkerk <[email protected]>:
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)
----------
assignee: docs@python
components: Documentation
messages: 166002
nosy: docs@python, pitrou, sbt
priority: normal
severity: normal
status: open
title: Note in documentation for weakrefs
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Python tracker <[email protected]>
<http://bugs.python.org/issue15412>
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