class fields vs __getattr__
aleaxit at yahoo.com
Fri Mar 9 11:58:02 CET 2001
"Joshua Marshall" <jmarshal at mathworks.com> wrote in message
news:9898al$j3j$1 at news.mathworks.com...
> If you try to get a field of an object, it seems __getattr__ is called
> only if no such field exists on the class. For exmaple:
Yes, this is the defined semantics of __getattr_: it's designed
and documented that way.
> I would have expected ob.x to return 2. Can anyone explain the
> rationale behind this behavior?
Performance AND simplicity in coding your __getattr__ -- when
called it KNOWS the attribute being requested is not already
defined (in the instance, its class, its bases).
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