Dragging up and old topic here... But I am attempting something similar here with no success. Basically I want to do something like was demonstrated (using python 2.1, Zope 2.5.1), but to call the 'default' __getattr__ subsequently so that I can put in my own handlers, before looking for 'standard' attrs present on this object through the normal __getattr__ method : __oldgetattr__ = __getattr__ def __getattr__(self, name): if name = 'foo': return self.foo() return self.__oldgetattr__(name) However just the assigment of __oldgetattr__ gives an attribute error. Looking at Andrew Milton's Portable Holes product it seems a similar attempt to do this is made : ... try: __oldgetattr__ = ObjectManager.__getattr__ except: try: __oldgetattr__ = ObjectManager.inheritedAttribute('__getattr__') except: def __oldgetattr__(self, name): raise AttributeError, name ... If I try a similar thing to this, I always end up getting the 'old' one being defined as just the 'raise' statement. All other attempts to store the 'old' gettattr results in an attribute error. Is this simply not possible with this version of python and hence the current Zope release? Looks like with 2.2 you can do something like this (taken from Guido's presentation as OSCON 2001) : class C(object): def __getattr__(self, name): if name == 'x': return ... return object.__getattr__(self, name) Thanks for any help/pointers! JB. Casey Duncan wrote:
If your __getattr__ fails to find what it wants, it should raise an AttributeError. This will give the ball back to the acquisition machinery.
Thusly:
def __getattr__(self, name): if name = 'foo': return self.foo() raise AttributeError, name
hth,
-Casey
On Tue, 2002-06-04 at 22:28, Erik A. Dahl wrote:
Ok I need to override __getattr__ in one of my product classes. I'm sure this is killing acquisition but not sure about the persistence stuff (I think this is working). Is there a way to make this work? Here is what I'm doing:
def __getattr__(self, name): if name == 'myattr': return self.myattr()
I assume that somewhere in the Acquisition code there is a __getattr__ but I can't find it. I tried calling Implicit.__getattr__ but its not there. If some one has an example that would be great.
-EAD
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