Class: Interface | Twisted-0.19.0/twisted/python/components.py |
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Base class for interfaces.Interfaces define and document an interface for a class. An interface class's name must begin with I, and all its methods should have no implementation code. Objects that implement an interface should have an attribute __implements__, that should be either an Interface subclass or a tuple, or tuple of tuples, of such Interface classes. A class whose instances implement an interface should list the interfaces its instances implement in a class-level __implements__. For example: | class IAdder(Interface): | 'Objects implementing this interface can add objects.' | | def add(self, a, b): | 'Add two objects together and return the result.' | | class Adder: | | __implements__ = IAdder | | def add(self, a, b): | return a + b |