code: def on_before_trading(self, date_time):
          
  
          if self.cta_call['pos'] > 0:
              self.cta_call['days'] += 1
          if self.cta_put['pos'] > 0:
              self.cta_put['days'] += 1
  
          self.cta_call['done'] = False
          self.cta_put['done'] = False
docs: 开盘的时候检查，如果有持仓，就把持有天数 + 1