New submission from Philip Jenvey:
len() on WeakKeyDictionarys can fail with ValueErrors when _IterationGuards are
kept alive
Attached is a test showing this:
======================================================================
ERROR: test_weak_keys_len_destroy_while_iterating (__main__.MappingTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "Lib/test/test_weakref.py", line 1336, in
test_weak_keys_len_destroy_while_iterating
self.assertEqual(len(dict), 0)
ValueError: __len__() should return >= 0
One probably shouldn't keep them alive like this, but __len__ shouldn't be
blowing up either. On non ref counting GC platforms this situation is easier to
trigger unintentionally
----------
components: Library (Lib)
messages: 215716
nosy: pitrou, pjenvey
priority: normal
severity: normal
status: open
title: WeakKeyDictionary.__len__ fragile w/ _IterationGuards
type: behavior
versions: Python 3.2, Python 3.3, Python 3.4
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21173>
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