[Zope] Problems with inheritance in python base products

[Martijn Pieters]

At 04:06 17-10-99 , Sascha Matzke wrote:
>Hello,
>
>I want to design 2+ products which all share certain base
>functionality. So I moved some code into Shared.
>
>Now, when I try to create instances of the products I get the
>following error:
>
>Error Type: TypeError
>Error Value: unbound method must be called with class instance 1st
>              argument
>
>I use the following code:
>
>class B(A):
>
>       def __init__(self, some, more, parameters):
>           A.__init__(self, some, more)
>
>In my python knowlegde the above should be correct...

This is either caused by ExtensionClass or acquisition, I never bothered to 
get to the heart of it. It basically confuses the Python interpreter into 
not seeing the proper class hierarchy, and throwing above tantrum. The 
solution is simple: call .im_func() to use the unbound method:

   def __init__(self, some, more, parameters):
     A.__init__.im_func(self, some, more)

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Martijn Pieters, Web Developer
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