import scrapy
class PricescrapyItem(scrapy.Item):
    top_class = scrapy.Field()      # 大类
    sec_class = scrapy.Field()      # 小类
    product_name = scrapy.Field()   # 名称
    low_price = scrapy.Field()      # 最低价
    avg_price = scrapy.Field()      # 平均价
    high_price = scrapy.Field()     # 最高价
    specs = scrapy.Field()          # 规格
    origin = scrapy.Field()         # 来源
    unit = scrapy.Field()           # 单位
update_date = scrapy.Field()    # 更新时间
