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Component architecture for Twisted, based on Zope3 components.

Using the Zope3 API directly is strongly recommended. Everything
you need is in the top-level of the zope.interface package, e.g.::

   from zope.interface import Interface, implementer

   class IFoo(Interface):
       pass

   @implementer(IFoo)
   class Foo:
       pass

   print(IFoo.implementedBy(Foo)) # True
   print(IFoo.providedBy(Foo())) # True

L{twisted.python.components.registerAdapter} from this module may be used to
add to Twisted's global adapter registry.

L{twisted.python.components.proxyForInterface} is a factory for classes
which allow access to only the parts of another class defined by a specified
interface.
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              if arg == 3:
                  return 3
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