from dataclasses import dataclass

1from dataclasses import dataclass
2
3@dataclass
4class InventoryItem:
5    """Class for keeping track of an item in inventory."""
6    name: str
7    unit_price: float
8    quantity_on_hand: int = 0
9
10    def total_cost(self) -> float:
11        return self.unit_price * self.quantity_on_hand
12

1def __init__(self, name: str, unit_price: float, quantity_on_hand: int=0):
2    self.name = name
3    self.unit_price = unit_price
4    self.quantity_on_hand = quantity_on_hand
5    
6    def total_cost(self) -> float:
7        return self.unit_price * self.quantity_on_hand
8
9# Is the same as:
10    
11from dataclasses import dataclass
12
13@dataclass
14class InventoryItem:
15    """Class for keeping track of an item in inventory."""
16    name: str
17    unit_price: float
18    quantity_on_hand: int = 0
19      
20    def total_cost(self) -> float:
21        return self.unit_price * self.quantity_on_hand
22