def __len__(self):
        return len(self._mapping)
Update the IAM policy for the topic.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/jinja2-2.6/jinja2/utils.py/LRUCache.__len__--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/gcloud-python/gcloud/pubsub/topic.py/Topic.set_iam_policy