使用__new__方法 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 class Singleton(object): def __new__(cls, *args, **kw): if not hasattr(cls, '_instance'): orig = super(Singleton, cls) cls._instance = orig.__new__(cls, *args, **kw) return cls._instance class MyClass(Singleton): pass 共享属性 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 class Borg(object): _state = {} def __new__(cls, *args, **kw): ob = super(Borg, cls).……

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