def subscribing_strategy(self):
        """订阅一个策略

        Returns:
            [type] -- [description]
        """

        res = self.subscribed_strategy.assign(
            remains=self.subscribed_strategy.end.apply(
                lambda x: pd.Timestamp(x) - pd.Timestamp(datetime.date.today())
            )
        )
        #res['left'] = res['end_time']
        # res['remains']
        res.assign(
            status=res['remains'].apply(
                lambda x: 'running'
                if x > datetime.timedelta(days=0) else 'timeout'
            )
        )
        return res.query('status=="running"')