human
Solve the following python programming problem given the following code:
@ test_base.backend_specific ('postgresql', 'mysql') 
def test_external_writer_in_reader(self) : 
    context = oslo_context.RequestContext () 
    with enginefacade.reader.using (context) as session : 
        ping = session.scalar (select ([1])) 
        self.assertEqual (1, ping) 
        @ enginefacade.writer 
        def go(ctx) : 
            pass 
exc = self.assertRaises (TypeError, go, self) 
        self.assertEqual ("Can't upgrade a READER transaction to a WRITER mid-transaction", exc.args [0]) 
        with enginefacade.writer.independent.using (context) as sess2 : 
            self.assertIsNot (sess2, session) 
            self._assert_ctx_session (context, sess2) 
            session.add (self.User (name = 'u1_nocommit')) 
            sess2.add (self.User (name = 'u1_commit')) 
user = session.query (self.User).first () 
        self.assertEqual ('u1_commit', user.name) 
session = self.sessionmaker (autocommit = True) 
    self.assertEqual (session.query (self.User.name).order_by (self.User.name).all (), [('u1_commit',)]) 

    
    

    Fix the buggy line: exc = self.assertRaises (TypeError, go, self)
assistant
#Here is Python code to fix the buggy line: exc = self.

exc = self.assertRaises (TypeError, go, context)