Python 3.7 po ata, basta yung latest po. Thank you po masterreturn str(comPrice) or str(prod.get_price(bibilhin))
Try mo yang dalawa na yan you get a TypeError. You can't add string and int kaya need mo e convert ang data. Anong version ng Python gamit mo?
idol 
Thank you sirrrrkailangan mong lagyan ng "self' argument lahat ng method mo.. get_price(self, itemsbought)

Idol hahaha, salamat po.