I've written some class which allows me to derive from it to make objects lazy instantiated. Do you see notational improvements or maybe even cases where this method might not work (multiple inheritance etc.)? What else could I try? Here is the code

class LazyProxy(object):
    def __init__(self, cls, *params, **kwargs):
        self.__dict__["_cls"]=cls
        self.__dict__["_params"]=params
        self.__dict__["_kwargs"]=kwargs

        self.__dict__["_obj"]=None

    def __getattr__(self, name):
        if self.__dict__["_obj"] is None:
            self.__init_obj()

        return getattr(self.__dict__["_obj"], name)

    def __setattr__(self, name, value):
        if self.__dict__["_obj"] is None:
            self.__init_obj()

        setattr(self.__dict__["_obj"], name, value)

    def __init_obj(self):
        self.__dict__["_obj"]=object.__new__(self.__dict__["_cls"], *self.__dict__["_params"], **self.__dict__["_kwargs"])
        self.__dict__["_obj"].__init__(*self.__dict__["_params"], **self.__dict__["_kwargs"])


class LazyInit(object):
    def __new__(cls, *params, **kwargs):
        return LazyProxy(cls, *params, **kwargs)


class A(LazyInit): # classes meant to be lazy loaded are derived from LazyInit
    def __init__(self, x):
        print("Init A")
        self.x=14+x

a=A(1)
print("Go")
print("15=", a.x)

I've written some class which allows me to derive from it to make objects lazy-instantiated. Do you see notational improvements or maybe even cases where this method might not work (multiple inheritance etc.)? What else could I try?

class LazyProxy(object):
    def __init__(self, cls, *params, **kwargs):
        self.__dict__["_cls"]=cls
        self.__dict__["_params"]=params
        self.__dict__["_kwargs"]=kwargs

        self.__dict__["_obj"]=None

    def __getattr__(self, name):
        if self.__dict__["_obj"] is None:
            self.__init_obj()

        return getattr(self.__dict__["_obj"], name)

    def __setattr__(self, name, value):
        if self.__dict__["_obj"] is None:
            self.__init_obj()

        setattr(self.__dict__["_obj"], name, value)

    def __init_obj(self):
        self.__dict__["_obj"]=object.__new__(self.__dict__["_cls"], *self.__dict__["_params"], **self.__dict__["_kwargs"])
        self.__dict__["_obj"].__init__(*self.__dict__["_params"], **self.__dict__["_kwargs"])


class LazyInit(object):
    def __new__(cls, *params, **kwargs):
        return LazyProxy(cls, *params, **kwargs)


class A(LazyInit): # classes meant to be lazy loaded are derived from LazyInit
    def __init__(self, x):
        print("Init A")
        self.x=14+x

a=A(1)
print("Go")
print("15=", a.x)