_Prevent_ dynamic attribute addition?

[Sean 'Shaleh' Perry]

On Friday 30 August 2002 10:13, Robert Oschler wrote:
> Python newbie here, using Python 2.2.2 on a SuSE Linux box.  There's a
> feature in Python I find very powerful but a bit disconcerting, the ability
> to add new attributes to a class object dynamically.  Is there a way to
> make a class 'non-modifiable' in that sense, without losing the ability to
> further derive from it?  Here's a scenario that describes my concern:
>
> Is there a way to make a class 'non-modifiable', or am I just not
> understanding something here?
>
> thx

The only way I know of is defining __setattr__() and throwing an exception on 
items not allowed.