How to create simple thread safe singletone that protect __init__ on import module

[umen]

Hello all
i trying to create simple singletone that is easy to understand .
i need it to be thread safe , and that the __init(self)__
should be initiated only once even if it importing the singletune module .
i managed to construct this :

class DBUtils():
    __instance = None
    __data = None
    def __new__(cls):
        if cls.__instance is None:
            cls.__instance = super(DBUtils, cls).__new__(cls)
            cls.__instance.__initialized = False
        return cls.__instance

    def __init__(self):
        if (self.__initialized): return
        self.__initialized = True
        self.__data = 1

but im not sure if it thread safe ..
my question is :
are there any more elegant way to implemant it ?
to be able using metadata or inheritance of somekind ?
examples from the internet dosn't protecting from invoking the __init(self)__ from import module stage .

Thanks