[PEAK] pyprotocols

[darryl]

Here's an example from twisted [twisted components] :

from twisted.python import components

class IAmericanSocket(components.Interface):
    def voltage(self):
      """Return the voltage produced by this socket object, as an integer.
      """         
    
class AmericanSocket:
    __implements__ = (IAmericanSocket, )
    def voltage(self):
        return 110

class ForeignSocket:
    def voltage(self):
        return 220

class AdaptToAmericanSocket(components.Adapter):
    __implements__ = (IAmericanSocket, )
    def voltage(self):
        return self.original.voltage() / 2
    
components.registerAdapter(
    AdaptToAmericanSocket, 
    ForeignSocket, 
    IAmericanSocket)

>>> as = AmericanSocket() 
>>> fs = ForeignSocket()
>>> components.implements(as, IAmericanSocket)
1
>>> components.implements(fs, IAmericanSocket)
0

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What is the peak/pyprotocol way to do this?