code: def checkStock(self):
          
          if not self.preferences:
              logger.debug("no preferences")
              return None
          soup = BeautifulSoup(
              self.xpath(path['stock-table'])[0].html, "html.parser")
          count = 0
          # iterate through product in left panel
          for product in soup.select("div.tradebox"):
              prod_name = product.select("span.instrument-name")[0].text
              stk_name = [x for x in self.preferences
                          if x.lower() in prod_name.lower()]
              if not stk_name:
                  continue
              name = prod_name
              if not [x for x in self.stocks if x.product == name]:
                  self.stocks.append(Stock(name))
              stock = [x for x in self.stocks if x.product == name][0]
              if 'tradebox-market-closed' in product['class']:
                  stock.market = False
              if not stock.market:
                  logger.debug("market closed for %s" % stock.product)
                  continue
              sell_price = product.select("div.tradebox-price-sell")[0].text
              buy_price = product.select("div.tradebox-price-buy")[0].text
              sent = int(product.select(path['sent'])[0].text.strip('%')) / 100
              stock.new_rec([sell_price, buy_price, sent])
              count += 1
          logger.debug(f"added %d stocks" % count)
          return self.stocks
docs: check stocks in preference