class CustomExporter(CsvItemExporter):

    def __init__(self, settings, *args, **kwargs):
        super().__init__(settings)

        delimiter = settings.get('CSV_DELIMITER', ',')
        self._kwargs['delimiter'] = delimiter

        dir_path = settings.get(name='OUTPUT_DIRECTORY')
        uri = settings.get(name='FEED_URI')
        self.urifmt = os.path.join(dir_path, uri)
        self.csv_writer = csv.writer(self.stream, **self._kwargs)