[Python] why field = max(0,5) does not work and field -= 5 works well? [closed]

if i use "hp = max(~ )" print hp result won't change at all

if i use "hp -= value" print hp result works fine

Why?

Stat.py

class Stat:
def __init__(self, hp=0, mp=0, dmg=0):
def __add__(self, other):
def damage(self, self_instance, value):
self_instance.base_stat.hp = max(0, self_instance.base_stat.hp - value)
self_instance.base_stat.hp -= value
print(f" magic damage")
if self.hp > 0:
return True
else:
return False


Full code https://github.com/smc9759/Assignment_OOP

Skill.py

from abc import ABC, abstractmethod

class Skill(ABC):
def __init__(self):
@abstractmethod
def use(self, caster, target):
pass

class Spark(Skill):
def __init__(self):
def use(self, caster, target):
skill_dmg = 60 + (caster.stat.dmg * 2)
target.stat.damage(target, skill_dmg)



Character.py

class character(Player):
def __init__(self, name, role):
self.name = name
self.role = role
self.base_stat = role.base_stat.copy()
@property
def stat(self):
return self.base_stat

def use_skill(self, target):
self.role.use_skill(self, target)

def show_status(self):
print(f"Name : {self.name}\n HP : {self.stat.hp}\n MP : {self.stat.mp}")


Role.py

class Role(ABC):
def __init__(self, base_stat=ROLE_STAT_CONFIG["Newbie"], skill = None):
self.base_stat = base_stat


main.py

warrior = character("MC_hammer", WARRIOR)

mage = character("SpoonKiller", MAGE)


mage.use_skill(warrior)
warrior.use_skill(mage)

warrior.show_status()
mage.show_status()


i tried = max i expected changes to hp but there was no change

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