hello, I've a problem to have a class which inherits from zope base classes (Role.RoleManager, Acquisition.Implicit, ObjectManager.ObjectManager and Persistent) and classes from another package. As soon as a class inherits from one of the zope base class, I get an exception when I try to instantiate an object of this class. This exception is raised when I try to call the ancestor constructor: ZNodeImpl.__init__(self, id, title) TypeError: unbound method __init__() must be called with instance as first argument this sounds like my class doesn't inherit from ZNodeImpl but it does !! If I remove the zope base class, everything works correctly... it seems to have some python black magic here. Anybody can explain this to me or give some pointers ? TIA -- Sylvain Thénault