[Zope] Inheritance and __init__

[TFE MMS JARVIS JOHN]

I think I found the answer:
http://www.digicool.com/releases/ExtensionClass/ExtensionClass.html

Changing the code for Zope to

B.Zope:
#--nothing.py--
<Various imports, etc.>
from ExtensionClass import Base ###Added
import supernothing

class nothing(Base,            ###Added
              supernothing.Supernothing, ##Changed position
              Acquisition.Implicit,
              Persistent,
              AccessControl.Role.RoleManager,
              OFS.SimpleItem.Item
              ):
    """Blank skeleton class.

    """"

<Various manage settings, etc>

    def __init__(self,id,title,greeting):
        self.id=id
        self.title=title
        nothing.inheritedAttribute('__init__')(self,greeting) ##Changed

<the rest...>

Fixes it. 
All I can guess is that my base class and the Zope base classes
were clashing somehow?
I won't even try to pretend that I understand. ;^)

Back to the mill...
John Jarvis


> -----Original Message-----
> From:	TFE MMS JARVIS JOHN [SMTP:jarvis.sd082@ex.tel.co.jp]
> Sent:	Monday, April 12, 1999 4:16 PM
> To:	zope@zope.org
> Subject:	[Zope] Inheritance and __init__
> 
> 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
> 
> 
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