Hopefully this is enough context for this question. When I subclass Acquisition.Implicit or .Explicit, I find myself losing the foo["item"] and foo[slice:slice] syntax. __getslice__ and __getitem__ aren't affected. When I don't subclass Acquisition, the [] syntax works fine. I can get them back by explcitly redefining them __getslice__ and __getitem__ (even though those methods never had any problems), but is there a better way around this? I'm doing a lot of other craaazzy stuff with these classes, I may be causing this problem myself elsewhere. I'm not defining foo.__getslice__, rather I'm defining __getattr__ in a superclass, and returning the result of a call on a proxied object for attr names that match a list. But this does look like the [] syntax is running into the fact that you need to call inheritedAttribute rather than the superclass method directly, or something. Here's what I'm doing to make this work: class ManageableNodeList(ManageableWrapper, DOMProxy.NodeListProxy, Acquisition.Implicit): def __getslice__(self, i, j): return self.__getattr__("__getslice__")(i,j) def __getitem__(self, i): return self.__getattr__("__getitem__")(i) -- Karl Anderson karl@digicool.com