I have a zope containment hierarchy base/somefolder/myobj base/other base, somefolder, myobj, and other are all instances of a MyFolder class which is derived from Folder. MyFolder is a simple extension of Folder that limits the allowed meta classes. I would like to acquire the 'other' folder from a myobj instance using the python API. Ie, I have a class method in which I need to be able to do def somemethod(self, someinstance): otherFolder = acquisition_magic(someinstance, 'other') where I know someinstance is a MyFolder instance which is either base itself, is contained in base (possibly deep in the tree). Ie, I would like this method to work if someinstance is one of base, somefolder, or myobj. Since all of these instances derive from Acquisition.Implicit via ObjectManager, I think I should be able to do this. I thought from Acquisition import aq_get, aq_acquire, aq_parent def somemethod(self, someinstance): folder = aq_acquire(someinstance, 'other') would do it for me, but this raises an AttributeError when passed a myobj instance. Thanks! JDH zope 2.7