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class ProxyField:
    def __init__(self, to):
        self.to_object, self.to_object_field = to.split('.')

    def __get__(self, instance, owner):
        if instance is None:
            return self
        return getattr(self.delegate(instance), self.to_object_field)

    def delegate(self, instance):
        return getattr(instance, self.to_object)