New submission from Yury Selivanov <yseliva...@gmail.com>:
WeakSet has a bug in its '__len__' method, where it performs iteration though
'self.data' without ensuring _IterationGuard.
This leads to some hard to catch errors with the following traceback:
builtins.RuntimeError: Set changed size during iteration
File /usr/lib64/python3.2/_weakrefset.py, line 66, in __len__
return sum(x() is not None for x in self.data)
File /usr/lib64/python3.2/_weakrefset.py, line 66, in <genexpr>
return sum(x() is not None for x in self.data)
----------
components: Library (Lib)
files: weakset_len.patch
keywords: patch
messages: 154636
nosy: Yury.Selivanov, pitrou, rhettinger
priority: normal
severity: normal
status: open
title: __len__ method of weakset
type: crash
versions: Python 3.2, Python 3.3
Added file: http://bugs.python.org/file24681/weakset_len.patch
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<http://bugs.python.org/issue14159>
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