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I've got a class:
class odict(dict):
 def __init__(self, d={}):
 self._keys = d.keys()
 dict.__init__(self, d)
 def __setitem__(self, key, item):
 dict.__setitem__(self, key, item)
 if key not in self._keys:
 self._keys.append(key)
 ...
When I copy.deepcopy one of these it blows up in
__setitem__ with an AttributeError on _keys, because
__setitem__ is called without __init__ ever having been
called. Presumably this thing looks and smells like a
dictionary, so deepcopy thinks it is one.