python_dataclass_basic_definition_with_type_annotations.py

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