ifacetest.py

from zope.interface import Interface, implements
from twisted.python import components

class IFoo(Interface):
    def snark():
        """snark"""

class Bar(object):
    def poke(self):
        print "POKE!"

class BarFoo(components.Adapter):
    implements(IFoo)
    def snark(self):
        self.original.poke()

components.registerAdapter(BarFoo, Bar, IFoo)

bar = Bar()
foo = IFoo(bar)
foo.snark()