def test_bool(self):
        prio_set_list = event._PrioritizedSetList()

        assert bool(prio_set_list) is False

        prio_set_list.add(0, None)
        assert bool(prio_set_list) is True
def __erase_empty_clusters(self):
        clusters, means, variances, pic, gaussians, rc = [], [], [], [], [], []