JezK
Edit File: delegator.py
class Delegator: def __init__(self, delegate=None): self.delegate = delegate self.__cache = set() # Cache is used to only remove added attributes # when changing the delegate. 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): "Removes added attributes while leaving original attributes." # Function is really about resetting delagator dict # to original state. Cache is just a means for key in self.__cache: try: delattr(self, key) except AttributeError: pass self.__cache.clear() def setdelegate(self, delegate): "Reset attributes and change delegate." self.resetcache() self.delegate = delegate if __name__ == '__main__': from unittest import main main('idlelib.idle_test.test_delegator', verbosity=2)