metaclass error

[Aaron Steele]

hi,
i have a very simple package organized as follows:
!-----------------------------------------!
bgp/
   __init__.py
   managers/
           __init__.py
           ManagerInterface.py
           TestManager.py
!-----------------------------------------!
and here's ManagerInterface.py and TestManager.py:
!-----------------------------------------!
# ManagerInterface.py
class ManagerInterface(object):
   def __init__(self): pass
   def process(self, recset, operation):
       print 'In ManagerInterface.process()...'
# TestManager.py
import ManagerInterface
class TestManager(ManagerInterface):
   def process(self, recset, operation):
       print 'In TestManager.process()...' 
super(TestManager,self).process(recset,operation)
!-------------------------------------------!

when i try to import the TestManager module via the interpreter, i get 
the following error:

!-------------------------------------------!
$ python
Python 2.4.1c1 (#1, Mar 14 2005, 10:28:18)
[GCC 3.2.3 20030502 (Red Hat Linux 3.2.3-49)] on linux2
>>> import bgp.managers.TestManager
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
 File "bgp/managers/TestManager.py", line 2, in ?
   class TestManager(ManagerInterface):
TypeError: Error when calling the metaclass bases
   module.__init__() takes at most 2 arguments (3 given)
!-------------------------------------------!
any thoughts? i think that when python executes the TestManager class 
statement, it collects the base class (ManagerInterface) into a tuple 
and then executes the class body in a dictionary... is this where the 
error is happening?

thanks!
aaron
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