i had the same problem i passed a new value to the _property dict like this: {'id':'title', 'label':'Titel', 'initvalue':'TODO: Titel', 'type': 'string', 'mode': 'w',}, and then wrote a function which has to be called in manage_editProperties, so you have to óverride it: def _initClassAttribute(self,id,value): """ if id exists leave it """ if(not (self.__dict__.has_key(id))): #self.__dict__[id] = value setattr(self,id,value) def _initProperties(self): """ defines class attributes for the properties so no errror is raised, this is has to be called from manage_editProperties """ for prop in self._propertyMap(): name=prop['id'] value=prop['initvalue'] self._initClassAttribute(name,value) this helped in my situation cu bernd ----- Original Message ----- From: "Oliver Bleutgen" <myzope@gmx.net> To: <zope@zope.org> Sent: Wednesday, June 06, 2001 5:53 PM Subject: [Zope] python products and properties

Hi,

is there a way to handle properties in python products in order to get similar funtionality in as propertysheets in python?

I'm developing a product right now and it may be that I have to add some properties later (while in production). Right now I have to manually assign a newly added property to already existing instances, because adding the property in the _properties class attribute breaks the properties management tab of these instances. Am I missing something? What do others do?

Oh yeah, and I even have a great proof that I tried to find an answer in the archieves, check out this nice page:

http://www.y-tex.com/PYthon.html

It totally sold me on python products, I really didn't know that they are *that* potent.

cheers, oliver

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