dataclass_addition.py

# My playing around with dataclass addition, to see how I'd implement this example without a static method:
# https://stackoverflow.com/a/49269322/493553
from copy import copy
from dataclasses import dataclass

@dataclass
class Stats:
    strength: int = 0
    speed: int = 0
    intellect: int = 0
    tenacity: int = 0
    
    def __iadd__(self, other):
        for attr in self.__dict__:
            setattr(self, attr, getattr(self, attr) + getattr(other, attr))
        return self
    
    def __add__(self, other):
        if not other:
            return self
        obj = copy(self)
        obj += other
        return obj
    
    __radd__ = __add__

    
a = Stats(1, 2, tenacity=3)
b = Stats(4, 5, 6, 7)
print(sum([a, b]))  # prints: Stats(strength=5, speed=7, intellect=6, tenacity=10)