traceback

WeakKeyDictionary
Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/weakref.py", line 260, in remove
    del self.data[k]
KeyError: <weakref at 0x10be01a48; dead>
self.data:
{}
k:
<weakref at 0x10be01a48; dead>

Exception KeyError: KeyError(<weakref at 0x10be01a48; dead>,) in <function remove at 0x1056f8aa0> ignored
WeakKeyDictionary
Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/weakref.py", line 260, in remove
    del self.data[k]
KeyError: <weakref at 0x10be01940; dead>
self.data:
{}
k:
<weakref at 0x10be01940; dead>

weakref.py

class WeakValueDictionary(UserDict.UserDict):
    def __init__(self, *args, **kw):
        def remove(wr, selfref=ref(self)):
            try:
                self = selfref()
                if self is not None:
                    del self.data[wr.key]
            except:
                print "WeakValueDictionary:"
                import traceback
                traceback.print_exc()
                print "self.data:"
                print self.data
                print "wr.key:"
                print wr.key
                print
                raise
        self._remove = remove
        UserDict.UserDict.__init__(self, *args, **kw)

class WeakKeyDictionary(UserDict.UserDict):
    def __init__(self, dict=None):
        self.data = {}
        def remove(k, selfref=ref(self)):
            try:
                self = selfref()
                if self is not None:
                    del self.data[k]
            except:
                print "WeakKeyDictionary"
                import traceback
                traceback.print_exc()
                print "self.data:"
                print self.data
                print "k:"
                print k
                print
                raise
        self._remove = remove
        if dict is not None: self.update(dict)