WeakValueDictionary next bug (with multithreading) #72613

assignee = None
closed_at = <Date 2016-12-27.14:11:09.208>
created_at = <Date 2016-10-13.10:36:29.136>
labels = ['3.7', 'type-bug', 'library']
title = 'WeakValueDictionary next bug (with multithreading)'
updated_at = <Date 2017-08-02.14:08:14.442>
user = 'https://github.com/arigo'

activity = <Date 2017-08-02.14:08:14.442>
actor = 'dubiousjim'
assignee = 'none'
closed = True
closed_date = <Date 2016-12-27.14:11:09.208>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2016-10-13.10:36:29.136>
creator = 'arigo'
dependencies = []
files = ['45072', '45082', '45083', '45215', '45709', '45710', '45965']
hgrepos = []
issue_num = 28427
keywords = ['patch']
message_count = 20.0
messages = ['278555', '278587', '278637', '279380', '282053', '282054', '282087', '282088', '282089', '282407', '282409', '282428', '282432', '282434', '283625', '284096', '284100', '284101', '298283', '299659']
nosy_count = 9.0
nosy_names = ['tim.peters', 'fdrake', 'arigo', 'pitrou', 'larry', 'methane', 'python-dev', 'serhiy.storchaka', 'dubiousjim']
pr_nums = []
priority = 'critical'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28427'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6', 'Python 3.7']