[Zope] I get an error when calling "parent.__init__(self)"

[Chris McDonough]

Search the archives for 'inheritedAttribute'... This is a limitation of 
extension classes (most Zope classes are extension classes).

Max Møller Rasmussen wrote:
> I have a class, which contains the logic of a product.
> 
> class msgList:
>     
>     def __init__(self):
>         self.msgDict = {}
>         self._newId  = 0
> 
> Then I have another class which takes care of the more Zope related tasks.
> 
> class mxm_Discuss(SimpleItem.SimpleItem, msgList):
> 
>     def __init__(self, id, title):
>         "Inits the product with default values"
>         self.id = id
>         self.title = title
>         msgList.__init__(self)  <-------- Line 22
> 
> But when I try to instantiate it in Zope I get an error:
> 
> "Error Type: TypeError
> Error Value: unbound method __init__() must be called with instance as first
> argument"
> 
> Usually this error comes when I forget 'self' in a method. I cannot see what
> causes it here though.
> 
> Has anybody got a clue? It's probably something simple I have overlooked.
> 
> regards Max M
> 
> Traceback (innermost last):
>   File C:\zope\zope240\lib\python\ZPublisher\Publish.py, line 223, in
> publish_module
>   File C:\zope\zope240\lib\python\ZPublisher\Publish.py, line 187, in
> publish
>   File C:\zope\zope240\lib\python\Zope\__init__.py, line 226, in
> zpublisher_exception_hook
>   File C:\zope\zope240\lib\python\ZPublisher\Publish.py, line 171, in
> publish
>   File C:\zope\zope240\lib\python\ZPublisher\mapply.py, line 160, in mapply
>     (Object: manage_addmxm_DiscussAction)
>   File C:\zope\zope240\lib\python\ZPublisher\Publish.py, line 112, in
> call_object
>     (Object: manage_addmxm_DiscussAction)
>   File C:\zope\zope240\lib\python\Products\mxm_Discuss\mxm_Discuss.py, line
> 43, in manage_addmxm_DiscussAction
>   File C:\zope\zope240\lib\python\Products\mxm_Discuss\mxm_Discuss.py, line
> 22, in __init__
>     (Object: mxm_discuss)
> TypeError: (see above)
> 
> 
>                          - Nørgård Mikkelsen a/s -
>              www.normik.dk - Vandværksvej 18 - DK 5000 Odense C
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>                
> 
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-- 
Chris McDonough                    Zope Corporation
http://www.zope.org             http://www.zope.com
"Killing hundreds of birds with thousands of stones"