# Proxy object

class Proxy:

    '''A proxy that forwards all accesses to an inner object.

    Note that it does not forward attribute assignments.

    '''

    def __init__(self, inner): self.inner = inner

    def __getattr__(self, attr): return getattr(self.inner, attr)

    # Don't override __setattr__() because it prevents the subclass from storing

    # its own instance variables using "self." syntax