Python Lazy objects via __getattribute__, __setattr__ and dynamic classes and inheritance

lazy_object.py

def lazy(cls, *args, **kwargs):
    class _Lazy(cls):
        def __init__(self, *args, **kwargs):
            _Lazy.original_args = args
            _Lazy.original_kwargs = kwargs

        def _lazy_init(self):
            print(f"_lazy_init")
            # remove the traps so that they do not interfere in the next accesses
            del _Lazy.__setattr__
            del _Lazy.__getattribute__
            # invoke the __init__ of the "target" class
            super().__init__(*self.original_args, *self.original_kwargs)
            #change the parent class so that when we do a "type()" we no longer get "_Lazy", but the "real" class
            self.__class__ = _Lazy.__bases__[0]
                
        def __setattr__(self, name, value):
            print(f"setting attribute: {name}")
            #self._lazy_init() # can't do this as it will trigger the traps again
            # however, traps do not have effect on accesses to attributes through the class itself rather than through instances
            _Lazy._lazy_init(self)
            setattr(self, name, value)

        def __getattribute__(self, name):
            print(f"getting attribute: {name}")
            _Lazy._lazy_init(self)
            return getattr(self, name)
    
    return _Lazy(*args, **kwargs)


class Person:
    def __init__(self, name, age):
        print(f"{Person.__name__}.__init__")
        self.name = name
        self.age = age

    def say_hi(self, to_someone):
        print(f"{self.name} with age {self.age} says Bonjour to {to_someone}")


def test_1():
    lazy_p1 = lazy(Person, "Lazy Francois", 14)
    print(f"type: {type(lazy_p1).__name__}")
    # initialization takes place
    lazy_p1.say_hi("Xose") 
    
    # trap has been deactivated
    print(lazy_p1.name)
    lazy_p1.say_hi("Xose") 
    print(f"type: {type(lazy_p1).__name__}")


test_1()
# output:
# type: _Lazy
# getting attribute: say_hi
# _lazy_init
# Person.__init__
# Lazy Francois with age 14 says Bonjour to Xose
# Lazy Francois
# Lazy Francois with age 14 says Bonjour to Xose
# type: Person