Implements Implementation

# See if an object implements a given interfase


>>>def implements(obj,cls):
    original = dir(obj.__class__)
    target = dir(cls)
        for x in target:
            if x not in original:
                return False
        else:
            return True

# Test code
>>> class Food(object):
        def spoil(self):
            """Foods may get spoiled"""
            raise NotImplementedError	
>>> class Spam(Food):
        def get_slice(self,width):
            """width in cm of the slice"""
            raise NotImplementedError
>>> class Eggs(Food):
        def fry(self):
            """Fry the eggs"""
            raise NotImplementedError
>>> s = Spam()
>>> e = Eggs()
>>> implements(s,Spam), implements(e,Eggs) # s implements the Spam protocol
(True, True)
>>> implements(s,Eggs), implements(e,Spam) # e implements the Eggs protocol
(False, False)
>>> implements(s,Food), implements(e,Food) # Both implement the Food protocol
(True, True)

>>>