@gen.coroutine
  def _Notify(self):
    yield NotificationManager.NotifyRemoveContacts(self._client,
                                                   self._user_id,
                                                   self._notify_timestamp,
                                                   self._removed_contacts_reset)
Creates notifications:
dataset/ETHPy150Open viewfinderco/viewfinder/backend/op/remove_contacts_op.py/RemoveContactsOperation._Notify