def parse_rows(self, response):
        """Receives a response and a dict (representing each row) with a key for
        each provided (or detected) header of the CSV file.  This spider also
        gives the opportunity to override adapt_response and
        process_results methods for pre and post-processing purposes.
        """

        for row in csviter(response, self.delimiter, self.headers, self.quotechar):
            ret = iterate_spider_output(self.parse_row(response, row))
            for result_item in self.process_results(response, ret):
                yield result_item
Receives a response and a dict (representing each row) with a key for
        each provided (or detected) header of the CSV file.  This spider also
        gives the opportunity to override adapt_response and
        process_results methods for pre and post-processing purposes.
        
stackoverflow/venv/lib/python3.6/site-packages/scrapy/spiders/feed.py