Steve Alexander wrote:
Tim McLaughlin wrote:

According to docs and testing (in the interpreter) I can make a read-only calculated attribute using property() (I know that setters do not work w/ non-new-style classes). So I tried the following:

class CMixin:
def getter(self):
return 'test'
prop = property(getter)

and when I try to mix in this object w/ a Folder object, the instance returns <property object at 0x8b45edc> for the 'prop' attribute. Is this an issue with pickling or something else?

In Zope 2, the ExtensionClass that is the C base class used for Persistent classes, doesn't work with python 2.2 properties.
But, you can use a ComputedAttribute to get much the same effect.

Steve Alexander

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