Get attributes of a Topic

        :type topic: string
        :param topic: The ARN of the topic.

        :type attr_name: string
        :param attr_name: The name of the attribute you want to set.
                          Only a subset of the topic's attributes are mutable.
                          Valid values: Policy | DisplayName

        :type attr_value: string
        :param attr_value: The new value for the attribute.

def set_topic_attributes(self, topic, attr_name, attr_value):
        """
        Get attributes of a Topic

        :type topic: string
        :param topic: The ARN of the topic.

        :type attr_name: string
        :param attr_name: The name of the attribute you want to set.
                          Only a subset of the topic's attributes are mutable.
                          Valid values: Policy | DisplayName

        :type attr_value: string
        :param attr_value: The new value for the attribute.

        """
        params = {'ContentType' : 'JSON',
                  'TopicArn' : topic,
                  'AttributeName' : attr_name,
                  'AttributeValue' : attr_value}
        response = self.make_request('SetTopicAttributes', params, '/', 'GET')
        body = response.read()
        if response.status == 200:
            return json.loads(body)
        else:
            boto.log.error('%s %s' % (response.status, response.reason))
            boto.log.error('%s' % body)
            raise self.ResponseError(response.status, response.reason, body)