I'm trying to make an inventory system that will work by having a player have an inventory which is a list of items. I want to make a function that allows adding any object whose parent class is item such as, for example, weapon. While I can technically pass any child of the item class as a parameter, how do I make it clear it can be any child and not only the parent?
This is my current code
class item:
def __init__(self, weight : int, cost : int, name : int):
self.weight = weight
self.cost = cost
self.name = name
class weapon(item):
def __init__(self, attackinfo, _weight : int, _cost : int, _name : int):
super().__init__(_weight, _cost, _name)
self.attackinfo = attackinfo
class inventory:
def __init__(self):
self.items = []
def additem(self, _item : item):
self.items.append(item)
inventory1 = inventory()
inventory1.additem(weapon({"dmg" : 3, "range" : 10}, 5, 5, "bow"))
Your type hint already shows that so, in that regards, you have nothing that you need to change. def additem(self, item: Item) means that the item argument can be any instance of the class Item or any of its sub-classes.
Where your type hints fail is that you have declared name: int and then you pass a str in that argument.
You can use explicit type hints throughout like this:
class Item:
weight: int
cost: int
name: str
def __init__(self, weight: int, cost: int, name: str) -> None:
self.weight = weight
self.cost = cost
self.name = name
class Weapon(Item):
damage: int
range: int
def __init__(self, weight: int, cost: int, name: str, damage: int, range: int) -> None:
super().__init__(weight, cost, name)
self.damage = damage
self.range = range
class Inventory:
items: list[Item]
def __init__(self) -> None:
self.items = []
def additem(self, item: Item) -> None:
self.items.append(item)
inventory1 = Inventory()
inventory1.additem(Weapon(5, 5, "bow", 3, 10))
Note: PEP8 suggests using the CapWords convention when naming classes.