Simple Singleton « Python recipes « ActiveState Codeclass Singleton(type): def __init__(self, *args): type.__init__(self, *args) self._instances = {} def __call__(self, *args): if not args in self._instances: self._instances[args] = type.__call__(self, *args) return self._instances[args] class Test: __metaclass__=Singleton def __init__(self, *args): pass ta1, ta2 = Test(), Test() assert ta1 is ta2 tb1, tb2 = Test(5), Test(5) assert tb1 is tb2 asser
