design question: no new attributes

[Alan Isaac]

"Ben Finney" <bignose+hates-spam at benfinney.id.au> wrote in message
news:mailman.4438.1172534289.32031.python-list at python.org...
> The Pythonic design is: don't expect to have such control over users
> of your code.

I know this is a popular response,
but the fact of the matter remains that
it can be helpful to know when someone
tries to set a value for a nonexisting attribute.
This is especially true if there have been any
interface changes.

So my question remains:
how best to trap any such attempt
subsequent to object initialization?
(I am willing to have properties for
all data attributes, if that helps.)

Thank you,
Alan Isaac