Thanks for all of the responses; everyone was exactly correct, and obeying the binding rules for special methods did work in the example above. Unfortunately, I only have read-only access to the class itself (it was a VTK class wrapped with SWIG), so I had to find another way to accomplish what I was after.
On Oct 28, 10:26 pm, Lie Ryan <lie.1...@gmail.com> wrote: > On 10/29/2011 05:20 AM, Ethan Furman wrote: > > > > > > > > > > > > > Python only looks up __xxx__ methods in new-style classes on the class > > itself, not on the instances. > > > So this works: > > > 8<---------------------------------------------------------------- > > class Cow(object): > > pass > > > def attrgetter(self, a): > > print "CAUGHT: Attempting to get attribute", a > > > bessie = Cow() > > > Cow.__getattr__ = attrgetter > > > print bessie.milk > > 8<---------------------------------------------------------------- > > a minor modification might be useful: > > bessie = Cow() > bessie.__class__.__getattr__ = attrgetter -- http://mail.python.org/mailman/listinfo/python-list
