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# Proxy object
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class Proxy:
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    '''A proxy that forwards all accesses to an inner object.
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    Note that it does not forward attribute assignments.
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    '''
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    def __init__(self, inner): self.inner = inner
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    def __getattr__(self, attr): return getattr(self.inner, attr)
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    # Don't override __setattr__() because it prevents the subclass from storing
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    # its own instance variables using "self." syntax
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