New PEP: Attribute Access Handlers

[Paul Prescod]

Robin Becker wrote:
> 
> ...
> If the attr is a mutable sequence/map etc how can they be made readonly
> using this scheme, are we forced to make immutable string types etc

There are two different things. One is stopping the attr from being
re-bound. That's what the PEP allows. The other is stopping the attr
*value* from being mutated. That depends on the design of the attr
value.

I guess the PEP could help (a little) with that too. 

  def __get_foo__(self, op, val ):
    return ReadOnlyProxy( self.__foo )
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