human
Solve the following python programming problem given the following code:
@ patch ('flowlogs_reader.flowlogs_reader.boto3.session', autospec = True) 
def test_region_name(self, mock_session) : 
    FlowLogsReader ('some_group', region_name = 'some-region') 
    mock_session.Session.assert_called_with (region_name = 'some-region') 
    FlowLogsReader ('some_group') 
    mock_session.Session.assert_called_with () 
    FlowLogsReader ('some_group', boto_client_kwargs = { 
        'region_name' : 'my-region', 
}) 
    mock_session.Session.assert_called_with (region_name = 'my-region') 
    def mock_response(* args, **kwargs) : 
        if ('region_name' not in kwargs) : 
            raise NoRegionError 
mock_session.Session ().client.side_effect = self 
    FlowLogsReader ('some_group') 
    mock_session.Session ().client.assert_called_with ('logs', region_name = DEFAULT_REGION_NAME) 

    
    

    Fix the buggy line: mock_session.Session ().client.side_effect = self
assistant
#Here is Python program to fix the buggy line: mock_session.

mock_session.Session ().client.side_effect = def mock_response(