import json

class SuningPipeline(object):

    def open_spider(self, spider):
        if spider.name == 'book':
            self.f = open('book.jsonlines', 'w', encoding='utf8')

    def process_item(self, item, spider):
        if spider.name == 'book':
            json.dump(item, self.f, ensure_ascii=False)
            self.f.write('\n')

        return item

    def close_spider(self, spider):
        if spider.name == 'book':
            self.f.close()