[Zope3-dev] Proposal: Improving on __implements__

[Steve Alexander]

Hi folks,

I've added a new proposal to the zope3 development wiki.

It is called "Improving on __implements__'.

http://dev.zope.org/Wikis/DevSite/Projects/ComponentArchitecture/BetterInterfaceImplements


The main thing I'm proposing is to simplify the syntax for declaring 
what interfaces are implemented by instances of a class and so forth.

Here's an example from the proposal to give you a flavour, but please 
read the proposal before replying here.


class ServiceSubscriberEventChannel(SubscriptionTracker, EventChannel):
     """An event channel that wants to subscribe to the nearest
     event service when bound, and unsubscribe when unbound.
     """

     __implements__ = (
         EventChannel.__implements__,
         SubscriptionTracker.__implements__,
         IBindingAware
         )

Becomes this:

from zope.interface import implements, implementsLike

class ServiceSubscriberEventChannel(SubscriptionTracker, EventChannel):
     """An event channel that wants to subscribe to the nearest
     event service when bound, and unsubscribe when unbound.
     """

     implementsLike(EventChannel, SubscriptionTracker)
     implements(IBindingAware)


--
Steve Alexander