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 = {}

     8 

     9     def __getattr__(self, name):

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

    11         setattr(self, name, attr)

    12         self.__cache[name] = attr

    13         return attr

    14 

    15     def resetcache(self):

    16         for key in self.__cache.keys():

    17             try:

    18                 delattr(self, key)

    19             except AttributeError:

    20                 pass

    21         self.__cache.clear()

    22 

    23     def cachereport(self):

    24         keys = self.__cache.keys()

    25         keys.sort()

    26         print keys

    27 

    28     def setdelegate(self, delegate):

    29         self.resetcache()

    30         self.delegate = delegate

    31 

    32     def getdelegate(self):

    33         return self.delegate