def on_bar_day(self, tiny_bar):
        """收盘时会触发一次日k回调"""
        bar = tiny_bar
        symbol = bar.symbol
        str_dt = bar.datetime.strftime("%Y%m%d %H:%M:%S")
        str_log = "on_bar_day symbol=%s dt=%s  open=%s high=%s close=%s low=%s vol=%s" % (
            symbol, str_dt, bar.open, bar.high, bar.close, bar.low, bar.volume)
        self.log(str_log)