1 class Delegator: 2 3 # The cache is only used to be able to change delegates! 4 5 def __init__(self, delegate=None): 6 self.delegate = delegate 7 self.__cache = set() 8 9 def __getattr__(self, name): 10 attr = getattr(self.delegate, name) # May raise AttributeError 11 setattr(self, name, attr) 12 self.__cache.add(name) 13 return attr 14 15 def resetcache(self): 16 for key in self.__cache: 17 try: 18 delattr(self, key) 19 except AttributeError: 20 pass 21 self.__cache.clear() 22 23 def setdelegate(self, delegate): 24 self.resetcache() 25 self.delegate = delegate 26
