[Python-Dev] Object customization (was: Arbitrary attributes on funcs and methods)

[Vladimir Marangozov]

Skip Montanaro wrote:
> 
> Barry's proposal would allow the Spam.eggs author to attach an attribute to
> it:
> 
>     class Spam:
>         def eggs(self, a):
>             "doc"
>             return a
>         eggs.__zope_access__ = "private"
> 
> I think the solution you're proposing is
> 
>     class Spam:
>         class EggsMethod:
>             def __call__(self, a):
>                 "doc"
>                 return a
>             __zope_access__ = "private"
>         eggs = EggsMethod()
> 
> This seems to work, but also seems like a lot of extra baggage (and a
> performance hit to boot) to arrive at what seems like a very simple concept.
> 

If you prefer embedded definitions, among other things, you could do:

	__zope_access__ = { 'Spam' : 'public' }

	class Spam:
	    __zope_access__ = { 'eggs' : 'private',
                                'eats' : 'public' }
	    def eggs(self, ...): ...
            def eats(self, ...): ...

or have a completely separate class/structure for access control
(which is what you would do it in C, btw, for existing objects
to which you can't add slots, ex: file descriptors, mem segments, etc).

-- 
       Vladimir MARANGOZOV          | Vladimir.Marangozov@inrialpes.fr
http://sirac.inrialpes.fr/~marangoz | tel:(+33-4)76615277 fax:76615252