def _original_attr(self, attr_name):
        """Return the original attribute off of the proxy on the target object.

        :param str attr_name: the name of the original attribute to return
        :return: Func or None.
        :rtype: func
        """
        try:
            return getattr(
                getattr(self.obj.__class__, attr_name), '_doubles_target_method', None
            )
        except AttributeError:
            return None
Return the original attribute off of the proxy on the target object.

        :param str attr_name: the name of the original attribute to return
        :return: Func or None.
        :rtype: func