def list_subscriptions(self, page_size=None, page_token=None):
        api = self.subscriber_api
        resources, next_token = api.list_subscriptions(
            self.project, page_size, page_token)
        topics = {}
        subscriptions = [Subscription.from_api_repr(resource, self,
                                                    topics=topics)
                         for resource in resources]
        return subscriptions, next_token
List subscriptions for the project associated with this client.
dataset/ETHPy150Open GoogleCloudPlatform/gcloud-python/gcloud/pubsub/client.py/Client.list_subscriptions