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

[Eugene Coetzee]

Itamar Shtull-Trauring wrote:

>1. Switch classes from:
>
>  class C:
>      __implements__ = IFoo,
>
>to:
>
>  class C:
>      zope.interface.implements(IFoo)
>
>and if you have third party subclasses that may depend on C having
>__implements__, also add:
>
>  twisted.python.components.backwardsCompatImplements(C)
>
>
>2. Using zope.interface APIs directly is better, e.g. IFoo.providedBy(o)
>rather than components.implements(o, IFoo). But! If the object is third
>party, it may be using __implements__, and if the class never got
>processed by t.p.c it will not be hooked up to zope.interface at all.
>So, you may want to do:
>
>   t.p.componets.fixClassImplements(o.__class__)
>
>this will make sure that __implements__ declarations get converted to
>new style implements declarations.
>
>3. Basically all of t.p.c is deprecated except for registerAdapter and
>the other APIs that talk to registry. Componentized is not, in theory,
>but hopefully will be replaced soon.
>
>  
>
Sorry,

but can you please explain :

1) What is t.p.c  and 

2) Why would one want to use Zope's interfaces in places of Twisted 
built-in interfaces

regards,

Eugene Coetzee

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