code: def on_bar_day(self, tiny_bar):
          
          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)
docs: 收盘时会触发一次日k回调