code: def test_del_isolation_level_segfault(self):
      with self.assertRaises(AttributeError):
          del self.con.isolation_level
  
imports: import datetime
  import unittest
  import sqlite3
  import weakref
  import functools
  from test import support
  from unittest.mock import patch
  from .util import memory_database, cx_limit
  from .util import MemoryDatabaseMixin
label_desc: Use image node_id 29 for calling the RegressionTests obj's underlying member method code with example usage: obj.test_del_isolation_level_segfault() without return types