DRY and static attribute for multiple classes.

Marc Aymerich glicerinu at gmail.com
Wed Feb 2 09:56:06 CET 2011


On Feb 2, 12:11 am, Peter Otten <__pete... at web.de> wrote:
> Marc Aymerich wrote:
> > Hi all,
> > I want to provide an encapsulated static attribute called _registry
> > for several classes.
>
> > I try to use inheritance in order to make it DRY: all classes inherit
> > from a BaseClass that implements the _registry encapsulation. But with
> > inheritance it doesn't work how I want, because a single instance of
> > the _registry is shared between all of the inherited classes, and I
> > want to have an independent _registry for every class.
>
> > How can I do that without coping all the code in every class?
>
> If you want to go fancy use a metaclass:
>
> >>> class Base(object):
>
> ...     class __metaclass__(type):
> ...             def __init__(self, *args):
> ...                     type.__init__(self, *args)
> ...                     self.per_class = []


Many thanks Peter!!



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