[PEAK] Using peak.model as an observer subject

[Doug Quale]

"Phillip J. Eby" <pje at telecommunity.com> writes:

> At 09:48 PM 9/1/04 -0500, Doug Quale wrote:
> >"Phillip J. Eby" <pje at telecommunity.com> writes:
> >
> > > At 09:11 PM 9/1/04 -0500, Doug Quale wrote:
> > >
> > > >I have a Python 101 type question:  What is the advantage of using
> > > >key = feature.attrName+'__event' instead of key = '__event'?
> > >
> > > To have an event object for each feature.
> >
> >But doesn't each feature already have a separate __dict__?
> 
> It does, but that's not the one we're using.  If we did, callbacks
> would be issued when that feature was changed on *any* object, not
> just the one we registered on.

OK, I hadn't considered the possibility that feature objects could be
shared by different objects.  How would that happen, and under what
circumstances would we want to do it?