code: def copy(self):
          
          new_client = self._client.copy()
          return self.__class__(
              self.instance_id,
              new_client,
              self.configuration_name,
              node_count=self.node_count,
              display_name=self.display_name,
          )
docs: Make a copy of this instance.
  
          Copies the local data stored as simple types and copies the client
          attached to this instance.
  
          :rtype: :class:`~google.cloud.spanner_v1.instance.Instance`
          :returns: A copy of the current instance.