test_dbm_ndbm.py 文件源码

def test_context_manager(self):
        with dbm.ndbm.open(self.filename, 'c') as db:
            db["ndbm context manager"] = "context manager"

        with dbm.ndbm.open(self.filename, 'r') as db:
            self.assertEqual(list(db.keys()), [b"ndbm context manager"])

        with self.assertRaises(dbm.ndbm.error) as cm:
            db.keys()
        self.assertEqual(str(cm.exception),
                         "DBM object has already been closed")