[Zope] Inheritance and __init__

[TFE MMS JARVIS JOHN]

Hi!

I'm kind of stuck: 
I'm trying to write a product that is a subclass of some other class 
that I wrote for something else.  I'm having a problem with calling
the superclass's __init__ method from within the subclass's 
__init__ method.

It works within Python but not Zope. ?

I don't have any comprehensible code to show, so here's 
some test code I've been using:

The superclass:

#--supernothing.py--
class Supernothing:
    def __init__(self,greeting="hello"):
        self.greeting=greeting

    def sayhi(self):
        return self.greeting

The subclasses look something like:

A.Python only:
#--subnothing.py --
import supernothing
class Subnothing(supernothing.Supernothing):
    def __init__(self,greeting="I'm here!"):
        supernothing.Supernothing.__init__(self,greeting)

B.Zope:
#--nothing.py--
<Various imports, etc.>
import supernothing
class nothing(Acquisition.Implicit,
              Persistent,
              AccessControl.Role.RoleManager,
              OFS.SimpleItem.Item,
              supernothing.Supernothing):
    """Blank skeleton class.

    """"

<Various manage settings, etc>

    def __init__(self,id,title,greeting):
        self.id=id
        self.title=title
        supernothing.Supernothing.__init__(self,greeting)   # This is line
50

<bunch of other stuff>

def addNothing(self,id,title,REQUEST=None,greeting='I am nothing!'):
    """Add a Nothing object.

    """
    obj=nothing(id,title, greeting)
    self._setObject(id,obj)

<the rest...>

Version A works (in the Python interpreter, of course). Version B
gives an error(in Zope):
Traceback (innermost last):
  File /usr/lib/python1.5/ZPublisher/Publish.py, line 877, in publish_module
  File /usr/lib/python1.5/ZPublisher/Publish.py, line 590, in publish
    (Info: /queries/pictest/manage_addNothing)
  File /usr/lib/python1.5/Products/nothing/nothing.py, line 81, in
addNothing
    (Object: Navigation)
  File /usr/lib/python1.5/Products/nothing/nothing.py, line 50, in __init__
    (Object: RoleManager)
TypeError: unbound method must be called with class instance 1st argument

Can anyone see what I am missing here?

TIA!
John Jarvis