weakref callbacks are called only if the weakref is alive

[noamr]

BPO	1379023
Nosy	@arigo
Files	libweakref.tex.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2005-12-29.17:43:34.000>
created_at = <Date 2005-12-12.21:34:21.000>
labels = ['docs']
title = 'weakref callbacks are called only if the weakref is alive'
updated_at = <Date 2005-12-29.17:43:34.000>
user = 'https://bugs.python.org/noamr'

bugs.python.org fields:

activity = <Date 2005-12-29.17:43:34.000>
actor = 'arigo'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2005-12-12.21:34:21.000>
creator = 'noamr'
dependencies = []
files = ['6917']
hgrepos = []
issue_num = 1379023
keywords = ['patch']
message_count = 2.0
messages = ['49191', '49192']
nosy_count = 2.0
nosy_names = ['arigo', 'noamr']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1379023'
versions = []

[noamr]

Weak reference objects have an optional callback
argument, which is a function that is called when the
original object is killed. This function is called only
if the created weakref object is still alive. This fact
isn't mentioned in the documentation - this patch
mentions it.

[arigo]

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user_id=4771

Checked in as r41846.