code: def unsubscribe_stratgy(self, strategy_id):
          
  
          today = datetime.date.today()
          order_id = str(uuid.uuid1())
          if strategy_id in self._subscribed_strategy.keys():
              self._subscribed_strategy[strategy_id]['status'] = 'canceled'
  
          self.coins_history.append(
              [0,
               strategy_id,
               str(today),
               0,
               order_id,
               'unsubscribe']
          )
docs: 取消订阅某一个策略
  
          Arguments:
              strategy_id {[type]} -- [description]