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v0.5.1
https://github.com/python/cpython
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Tip revision: d434e9f672961946e8c2cbe603f23dd275546bb2 authored by Barry Warsaw on 07 November 2008, 03:08:42 UTC
De-tagging
Tip revision: d434e9f
Delegator.py
class Delegator:

    # The cache is only used to be able to change delegates!

    def __init__(self, delegate=None):
        self.delegate = delegate
        self.__cache = {}

    def __getattr__(self, name):
        attr = getattr(self.delegate, name) # May raise AttributeError
        setattr(self, name, attr)
        self.__cache[name] = attr
        return attr

    def resetcache(self):
        for key in self.__cache:
            try:
                delattr(self, key)
            except AttributeError:
                pass
        self.__cache.clear()

    def cachereport(self):
        keys = list(self.__cache.keys())
        keys.sort()
        print(keys)

    def setdelegate(self, delegate):
        self.resetcache()
        self.delegate = delegate

    def getdelegate(self):
        return self.delegate
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