[Python-Dev] __dir__, part 2

Guido van Rossum guido at python.org
Fri Nov 10 22:12:19 CET 2006

On 11/10/06, Fredrik Lundh <fredrik at pythonware.com> wrote:
> Guido van Rossum wrote:
> > I think that ought to go into the guidlines for what's an acceptable
> > __dir__ implementation. We don't try to stop people from overriding
> > __add__ as subtraction either.
> to me, overriding dir() is a lot more like overriding id() than over-
> riding "+".  I don't think an object should be allowed to lie to the
> introspection mechanisms.

Why not? You can override __class__ already. With a metaclass you can
probably override inspection of the class, too.

--Guido van Rossum (home page: http://www.python.org/~guido/)

More information about the Python-Dev mailing list