[Twisted-Python] Re: Notes on switching twisted to new zope.interface code

Andrew Bennetts andrew-twisted at puzzling.org
Mon Jul 19 01:43:21 EDT 2004

On Mon, Jul 19, 2004 at 01:26:42AM -0400, Alex Levy wrote:
> What about subclasses?
> class C:
>   __implements__ = IFoo,
> class D(C):
>   __implements__ = (C.__implements__, IFoo)
> Do Zope interfaces need anything special to handle this?

(Did you really mean to use IFoo twice in your example?)

See the Zope interfaces package documentation for details, but this:

    class C:
        __implements__ = (IFoo,)
    class D:
        __implements__ = (C.__implements__, IBar)

would become this:

    from zope.interface import implements
    class C:
    class D:

i.e. implements adds to the list of interfaces the class implements.
There's also an "implementsOnly" function.

See README.txt from the zope.interface package for more details:


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