While debugging a Product that inherits from OFS.Folder stumbled across the following problem (copied from the debugger command line stopped inside one of my Product's methods):
self.__class__.__bases__[0].__bases__[3].__bases__[1] <class OFS.CopySupport.CopySource at 8d11e0>
isinstance (self, OFS.CopySupport.CopySource) 0
(self.__class__.__bases__[0].__bases__[3].__bases__[1] is OFS.CopySupport.CopySource) 1
The first line says self is an instance of OFS.CopySupport.CopySource, the second says it's not. The class objects are identical. My problem is that I'm not able to override one of OFS.CopySupport.CopySource's methods and to call the base classes method from inside. At that point I get a TypeError: unbound method must be called with class instance 1st argument which usually occurs when calling an unbound method with an instance of the wrong class. I'm clueless.. Stefan