'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):

    params = {'TopicArn': topic, 'AttributeName': attr_name, 'AttributeValue': attr_value}
    return self._make_request('SetTopicAttributes', params)
