class Delegator: # The cache is only used to be able to change delegates! def __init__(self, delegate=None): self.delegate = delegate self.__cache = set() def __getattr__(self, name): attr = getattr(self.delegate, name) # May raise AttributeError setattr(self, name, attr) self.__cache.add(name) return attr def resetcache(self): for key in self.__cache: try: delattr(self, key) except AttributeError: pass self.__cache.clear() def setdelegate(self, delegate): self.resetcache() self.delegate = delegate