code: def QA_fetch_lhb(date, db=DATABASE):
      '获取某一天龙虎榜数据'
      try:
          collections = db.lhb
          return pd.DataFrame([item for item in collections.find(
              {'date': date}, {"_id": 0})]).set_index('code', drop=False).sort_index()
      except Exception as e:
          raise f QA_fetch_lhb(date, db=DATABASE):
      '获取某一天龙虎榜数据'
      try:
          collections = db.lhb
          return pd.DataFrame([item for item in collections.find(
              {'date': date}, {"_id": 0})]).set_index('code', drop=False).sort_index()
      except Exception as e:
          raise e
docs: 获取某一天龙虎榜数据