code: def test_cant_reenter(self):
      raised_ok = False
      with self.conn:
          try:
              with self.conn:
                  pass
          except psycopg2.ProgrammingError:
              raised_ok = True
  
      self.assert_(raised_ok)
  
      # Still good
      with self.conn:
          pass
  
imports: import psycopg2
  import psycopg2.extensions
  import unittest
  from .testutils import ConnectingTestCase, skip_before_postgres, skip_if_crdb
label_desc: Use image node_id 8 for calling the WithConnectionTestCase obj's underlying member method code with example usage: obj.test_cant_reenter() without return types