code: def _example_order_book(quote_ctx):
      
      stock_code_list = ["US.AAPL", "HK.00700"]
  
      # subscribe "ORDER_BOOK"
      ret_status, ret_data = quote_ctx.subscribe(stock_code_list, ft.SubType.ORDER_BOOK)
      if ret_status != ft.RET_OK:
          print(ret_data)
          exit()
  
      for stk_code in stock_code_list:
          ret_status, ret_data = quote_ctx.get_order_book(stk_code)
          if ret_status != ft.RET_OK:
              print(stk_code, ret_data)
              exit()
          print("%s ORDER_BOOK" % stk_code)
          print(ret_data)
          print("\n\n")
docs: 获取摆盘数据，输出 买价，买量，买盘经纪个数，卖价，卖量，卖盘经纪个数