class Delegator:

    # The cache is only used to be able to change delegates!

    def __init__(self, delegate=None):

        self.delegate = delegate

        self.__cache = {}

    def __getattr__(self, name):

        attr = getattr(self.delegate, name) # May raise AttributeError

        setattr(self, name, attr)

        self.__cache[name] = attr

        return attr

    def resetcache(self):

        for key in self.__cache.keys():

            try:

                delattr(self, key)

            except AttributeError:

                pass

        self.__cache.clear()

    def cachereport(self):

        keys = self.__cache.keys()

        keys.sort()

        print keys

    def setdelegate(self, delegate):

        self.resetcache()

        self.delegate = delegate

    def getdelegate(self):

        return self.delegate