RE: [Zope] Inheritance and init

12 Apr 1999

      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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RE: [Zope] Inheritance and __init__

TFE MMS JARVIS JOHN

RE: [Zope] Inheritance and init