How to Fix Type Object Errors

In this tutorial, you'll learn about How to Fix Type Object Errors. We cover key concepts, practical examples, and best practices.

Fix type object errors when type-specific data duplicated per instance instead of shared via type object.

Quick Fix

Wrong

class Monster:
    def __init__(self,name,hp,mp,attack,defense):
        self.name=name; self.hp=hp; self.mp=mp
        self.attack=attack; self.defense=defense
goblins=[Monster('Goblin',50,10,15,5) for _ in range(100)]

All goblins share same stats. Duplicated 100 times. Memory waste. Changing goblin stats requires updating all instances.

Right

class MonsterType:
    def __init__(self,name,hp,mp,attack,defense):
        self.name=name; self.hp=hp; self.mp=mp
        self.attack=attack; self.defense=defense
class Monster:
    def __init__(self,type_):
        self.type=type_
        self.hp=type_.hp
    @property
    def attack(self): return self.type.attack
    @property
    def defense(self): return self.type.defense
goblin_type=MonsterType('Goblin',50,10,15,5)
goblins=[Monster(goblin_type) for _ in range(100)]

One MonsterType shared by all goblins. Stats from type object. Memory efficient. Type changes affect all instances.

Prevention

Type Object pattern shares type data across instances. Flyweight for game entities.

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