在python中获取GCP PubSub主题策略时出现Unicodeerror

python sample docs . 我正在使用create\u iot\u topic函数。 我的代码如下:

def create_iot_topic(topic_url):
    # eg: topic_url = 'projects/<projectname>/topics/<topicname>'
    topic1 = pubsub_client.topic(topic_url)
    print(topic_url)
    policy = topic1.get_iam_policy()
    publishers = policy.get('roles/pubsub.publisher', [])
    publishers.add(policy.service_account(
            'cloud-iot@system.gserviceaccount.com'))
    policy['roles/pubsub.publisher'] = publishers
    topic1.set_iam_policy(policy)

    return topic1

调用此函数时,第5行出现错误(get\u iam\u policy()函数):

UnicodeEncodeError: 'ascii' codec can't encode character u'\u2019' in position 1438: ordinal not in range(128)

我需要帮助解决这个问题。有人能告诉我哪里出了问题吗。

非常感谢。