def on_tick(self, context, tick):    print(tick)    fd_symbol = tick.symbol    fd_time = tick.time    fd_open = tick.open    fd_high = tick.high    fd_low = tick.low    fd_last = tick.last    fd_limit_up = tick.limit_up    fd_limit_down = tick.limit_down    fd_pre_close = tick.pre_close    fd_pre_settlement = tick.pre_settlement    fd_volume = tick.volume               #当前成交量    fd_total_volume = tick.total_volume          #总成交量    fd_list = tick.quotes[1][0]    f11_1 = timeturn(fd_time)    print(fd_list)

tick里的bid_p值怎么取？？