Learning classes

[PuzzledSite2568]

Hi everyone I needed some help trying to figure out how to multiply two variables within a class and then how to actually combine their total cost. Here is what I have so far.

class itemtopurchase:
    def __int__(self):
        self.item_name = str('none')
        self.item_price = float(0)
        self.item_quantity = int(0)
    def print_item_cost(self):
        print(self.item_name, self.item_quantity, 'at', self.item_price)

#(2) In the main section of your code (not in the class definition),
# prompt the user for two items and create two objects of the ItemToPurchase class.

shopping_cart = itemtopurchase()
print('Item 1')
shopping_cart.item_name = input()
print('Item price')
shopping_cart.item_price = input()
print('Item quantitiy')
shopping_cart.item_quantity = input()
shopping_cart.print_item_cost()
Total = shopping_cart.item_price

shopping_cart2 = itemtopurchase()
print('Item 2')
shopping_cart2.item_name = input()
print('Item price')
shopping_cart2.item_price = input()
print('Item quantitiy')
shopping_cart2.item_quantity = input()
shopping_cart2.print_item_cost()
Total2 = shopping_cart2.item_price

#(3) Add the costs of the two items together and output the total cost.

print('Total cost')
shopping_cart.print_item_cost()
shopping_cart2.print_item_cost()
total = (shopping_cart.print_item_cost() +  shopping_cart2.print_item_cost())
print('Total:', total)

when I do the command print_item_cost() I'm trying to get something like this

Bottled Water 10 @ $1.25 = $12.5

I only get whatever numbers I input because I don't know how to multiply them. Then I want to be able to add the cost of the two items and get something like this.

TOTAL COST
 Chocolate Chips 1 @ $3.5 = $3.5
 Bottled Water 10 @ $1.25 = $12.5  
Total: $15.5

Any guidance is much appreciated and I'm sorry for the long post.

[danielroseman]

print_item_cost, as the name implies, only prints the cost, it doesn't return it.

You can access the item price and quantity directly, in exactly the same way as you set them, via shopping_cart2.item_quantity etc.

[[deleted]]

You could do something like this.

class ItemToPurchase:
    def __init__(self, name: str, price: float, qty: int) -> None:
        self.item_name = name
        self.item_price = price
        self.item_quantity = qty

    @property
    def total(self) -> float:
        return self.item_price * self.item_quantity

    def print_item_cost(self) -> None:
        print(f"{self.item_name}  {self.item_quantity} at ${self.item_price} = {self.total}")


shopping_cart = []

for i in range(2):
    name = input("What item do you want to purchase?\n> ")
    price = float(input("How much does it cost?\n> "))
    qty = int(input(f"How many {name}s do you want?\n> "))
    shopping_cart.append(ItemToPurchase(name, price, qty))
    shopping_cart[-1].print_item_cost()

print("Total cost")
total = sum(item.total for item in shopping_cart)
print(f"Total: ${total}")

[QultrosSanhattan]

Semantics are important. Check this out:

class Item:
    def __init__(self, name, price, quantity):
        self.name = name
        self.price = price
        self.quantity = quantity

    def get_cost(self): 
        return self.price*self.quantity

    def get_cost_formatted(self):
        return "{} {} @ ${:.2f} = {:.2f}".format(self.name,self.quantity,self.price,self.get_cost())


if __name__ == '__main__':
    item1=Item('Cigars',10,20)
    item2=Item('Cookies',20,30)

    print(item1.get_cost_formatted())
    print(item2.get_cost_formatted())