docs: def _make_dir(self, client_kwargs):
          """
          Make a directory.
  
          args:
              client_kwargs (dict): Client arguments.
          """
          with _handle_oss_error():
              bucket = self._get_bucket(client_kwargs)
  
              # Object
              if 'key' in client_kwargs:
                  return bucket.put_object(
                      key=client_kwargs['key'], data=b'')
  
              # Bucket
              return bucket.create_bucket()