docs: def sell(self, no, price, value):
      ''' 賣 '''
      self.money += price*value
      try:
        self.store[no] += -value
      except:
        self.store[no] = -value
      try:
        self.avgprice[no]['sell'] += [price]
      except:
        try:
          self.avgprice[no]['sell'] = [price]
        except:
          self.avgprice[no] = {}
          self.avgprice[no]['sell'] = [price]