[Python] Python updating a subclass attribute [closed]

I'm learning to work with classes in Python and I can't understand why my subclass attribute is not being overwritten.

If I do char.info.name = "SOME" then everything works and the name attribute changes, but if I try to change the char.inv.items attribute from the char.inv class method then it just doesn't change.

Or rather I call char.inv.update() from char.inv.addItem() expecting that addItem() will change the base and update() will update everything in char.inv.items from the base.

def update(self, invDBObject):
self.items = []
inv = list(filter(lambda lst: lst[1] == self.charID, invDBObject))
for item in inv:
self.items.append(self.Item(self.charID, item[0], item[2]))


Is there something I'm doing wrong or something I don't know?

class Character:
def __init__(self, discordID, charID, invDBObject):
self.inv = self.Inv(charID, invDBObject)
class Inv:
def __init__(self, charID:int, invDBObject):
self.charID = charID
self.items = []
self.update(invDBObject)

def addItem(self, itemID, count):
global Database_Conn;Database_Conn.ping(reconnect=True)
DC = Database_Conn.cursor()

insertInDB = DC.execute(f"INSERT INTO inv VALUES ({itemID}, {self.charID}, {count});")
Database_Conn.commit()

invDBObject = DC.execute(f"SELECT * FROM inv;")
invDBObject = DC.fetchall()
self.update(invDBObject)

def update(self, invDBObject):
self.items = []
inv = list(filter(lambda lst: lst[1] == self.charID, invDBObject))
for item in inv:
self.items.append(self.Item(self.charID, item[0], item[2]))
def get(self, id:int):
for item in self.items:
if item.id == id:
return item
return None

class Item:
def __init__(self, charID, itemID, count):
self.charID = charID
self.id = itemID
self.count = count
def write(self):
global Database_Conn;Database_Conn.ping(reconnect=True)
DC = Database_Conn.cursor()
DC.execute(f"UPDATE inv SET count = {self.count} WHERE charID = {self.charID} and itemID = {self.id};")
Database_Conn.commit()


class CharactersHandler:
def __init__(self):
self.characters = []
for player in tqdm(players):
self.characters.append(Character(player[0], player[1], invDBObject))
def find(self, charID=None):
if charID is not None:
else:
for char in self.characters:
if str(char.charID) in str(search).split(sep=","):
else: return char


characters = CharactersHandler()


A function that attempts to change a character's object.

def editCharStats(infoType):
global characters
char = characters.find(int(charID))
itemObj = char.inv.get(int(itemID))
if (itemObj is None) and (int(value)>0):
char.inv.addItem(itemID, value)


When update() is called from __init__ on startup, everything works.

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