@property
    def is_credit(self):
        if self.total < 0:
            return True
        else: return False
Retrieve a node's stale state.
dataset/ETHPy150Open bread-and-pepper/django-brookie/brookie/models.py/Invoice.is_credit--crossover with--dataset/ETHPy150Open andrew-gardner/dependsworkflow/depends/depends_dag.py/DAG.nodeStaleState