class Delegator:

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

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def __init__(self, delegate=None):

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self.delegate = delegate

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self.__cache = set()

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def __getattr__(self, name):

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

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setattr(self, name, attr)

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self.__cache.add(name)

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return attr

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def resetcache(self):

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for key in self.__cache:

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try:

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delattr(self, key)

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except AttributeError:

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pass

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self.__cache.clear()

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def setdelegate(self, delegate):

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self.resetcache()

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self.delegate = delegate

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