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1class 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