[ZODB-Dev] OOBTree: Persistent Objects as keys

[Thomas Guettler]

  I have a strange problem with persistent objects as keys
in a OOBTree. It reduced the problem to this:

    def test_btree(self):
        for key in self._tree.keys():
            value=self._tree.get(key, None)
            if value==None:
                raise Exception, "Very strange: key not in tree.keys()"

It works if  I store integers as keys, but fails if I use my class with 
inherits
from Zope Folder. It only happens if the objects of my class are attached
to the zope tree. If they are not attached to the zope tree (which means 
garbage
collection would delete them as soon as the request finished) it works.

The __hash__ function of my class:
    _hash=0
    def __hash__(self):
        if self._hash==0: self._hash=randrange(0, 65536)
        return self._hash

It is very strange, because if I retry it is sometimes successful!

 thomas