class Vault:
    def __init__(self):
        self._treasure = "gold"
        self._known_good_copy = self.__dict__.copy()

    def __getattribute__(self, name):
        if name == "treasure":
            if self.__dict__ != self._known_good_copy:
                print("Attribute deleted!")
            return self._treasure
        else:
            return object.__getattribute__(self, name)

    def __setattr__(self, name, value):
        if name != "_treasure" and name != "_known_good_copy":
            print("Attribute deletion detected!")
            self._known_good_copy = self.__dict__.copy()
        object.__setattr__(self, name, value)
v = Vault()
Vault.treasure = " haha monkeypatched"
print(v.treasure)

'''
class Vault:
    def __init__(self):
        self._treasure = "gold"
        self._known_good_copy = self.__dict__.copy()

    def __get__(self, instance, owner):
        if instance is None:
            return self
        else:
            if instance.__dict__ != self._known_good_copy:
                print("Attribute deleted!")
            return self._treasure

    def __set__(self, instance, value):
        print("Attribute deletion detected!")
        self._known_good_copy = instance.__dict__.copy()

    def __delete__(self, instance):
        print("Attribute deletion detected!")
        self._known_good_copy = instance.__dict__.copy()

    def __set_name__(self, owner, name):
        self.name = name
v = Vault()
Vault._treasure = " haha monkeypatched"
print(v._treasure)
'''