New submission from mike bayer <mike...@zzzcomputing.com>:
The constructor for WeakValueDictionary does not obey the contract
documented in its comments:
# We inherit the constructor without worrying about the input
# dictionary; since it uses our .update() method, we get the right
# checks
yet it initializes with:
self.data = d = {}
d.update(*args, **kw)
i.e. the "update()" method of dict, so that a dict passed to the
constructor initializes non-weakrefed values in the dict which is
completely invalid state.
Contrast to that of 2.6, which properly uses the superclass:
UserDict.UserDict.__init__(self, *args, **kw)
A simple test which raises an exception on 3.0.1 is as follows:
import weakref
class Foo(object):
pass
mydict = dict((k, Foo()) for k in range(10))
w = weakref.WeakValueDictionary(mydict)
assert w[5]
----------
messages: 88577
nosy: zzzeek
severity: normal
status: open
title: WeakValueDictionary constructor ported to Python 3.0 incorrectly
versions: Python 3.0
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue6149>
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