code: def list_objects(self, bucket_name=None, **kwargs):
          
          if not bucket_name: bucket_name = self.bucket_name
          return self.client.list_objects(Bucket=bucket_name, **kwargs)
docs: This method is primarily for illustration and just calls the 
          boto3 client implementation of list_objects but is a common task
          for first time Predix BlobStore users.