__all__ in classes?

[Terry Reedy]

"Magnus Lie Hetland" <mlh at furu.idi.ntnu.no> wrote in message
news:slrnb2e3kb.gp8.mlh at furu.idi.ntnu.no...
> I just had an idea: Perhaps the following could be a useful
convention
> for private attributes (and methods)?
>
> >>> class Foo:
> ...     __all__ = 'bar', 'baz'
> ...     bar = 42
> ...     frozz = 51
> ...     def baz(self):
> ...         return 42
> >>> f = Foo()
> >>> f.bar
> 42
> >>> f.baz()
> 42
> >>> f.frozz
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> AttributeError: Foo attribute 'frozz' is private

Note that __all__ in modules does not work this way.  It only controls
what is exported as *, not what is accessible.

TJR