code: def buy(self, index):
          
          item = self.items[index]
          us = UserShopFront(self.usr, item.owner, item.id, str(item.price))
          us.load()
          
          if not item.name in us.inventory:
              return False
          
          if not us.inventory[item.name].buy():
              return False
                  
          return True
docs: Attempts to buy indexed item, returns result
             
          Parameters:
             index (int) -- The item index
             
          Returns
             bool - True if item was bought, false otherwise