text: from scrapy.loader import ItemLoader
  from scrapy.loader.processors import TakeFirst, Join, Compose
  
  
  class NewsLoader(ItemLoader):
      default_output_processor = TakeFirst()
  
  
  class ChinaLoader(NewsLoader):
      text_out = Compose(Join(), lambda s: s.strip())
      source_out = Compose(Join(), lambda s: s.strip())
  