def parse(self, response):
    with open('quotes-data.csv', 'w') as output_file:
        csv_writer = csv.writer(output_file, delimiter='t', quotechar="'")

        csv_writer.writerow(['title', 'author', 'description', 'tags'])
        i = 1
        for quote in response.xpath('//div[@class="book"]'):
            title  =  quote.xpath('./div[@class="title"]/text()').extract_first()
            author = quote.xpath('.//div[@class="author"]/text()').extract_first()
            description =  quote.xpath('.//div[@class="description"]/text()').extract_first()
            tags = quote.xpath('.//div[@class="keywords"]/span[@class="tag"]/text()').extract()
            tags = ' '.join(tags)
            tags = f'"{tags}"'
            author = f'"{author}"'
            description = f'"{description}"'
            row = [i, author, title, description, tags]
            csv_writer.writerow(row)

            i += 1

            yield {
                'title': title,
                'author': author,
                'tags': tags,
                'description': description
            }