[Python-Dev] PEP 447: add type.__locallookup__

Nick Coghlan ncoghlan at gmail.com
Thu Sep 19 12:12:33 CEST 2013

On 19 Sep 2013 20:00, "Paul Moore" <p.f.moore at gmail.com> wrote:
> On 19 September 2013 10:32, Ronald Oussoren <ronaldoussoren at mac.com>
> > The first time a method is called the bridge looks for an Objective-C
> > with the same name and adds that to the class dictionary. This works
fine for normal
> > method lookups, by overriding __getattribute__, but causes problems
with super:
> > super happily ignores __getattribute__ and peeks in the class __dict__
which may
> > not yet contain the name we're looking for and that can result in
incorrect results
> > (both incorrect AttributeErrors and totally incorrect results when the
name is
> > not yet present in the parent class' __dict__ but is in the
grandparent's __dict__).
> As an alternative approach, could you use a custom dict subclass as
> the class __dict__, and catch the peeking in the class __dict__ that
> way? Or is this one of those places where only a real dict will do?

Even Python 3 doesn't let you control the *runtime* type of the class dict,
only the type used during evaluation of the class body.

I've played with changing that - it makes for a rather special interpreter
experience :)


> Paul
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20130919/05d27e0a/attachment.html>

More information about the Python-Dev mailing list