class Singleton(type): def __init__(self, *args, **kwargs): self._instance = None super(Singleton, self).__init__(*args, **kwargs) def __call__(self, *args, **kwargs): if not self._instance: self._instance = super(Singleton, self).__call__(*args, **kwargs) return self._instance class Test(object): __metaclass__ = Singleton pass t1 = Test() t2 = Test() print t1 is t2 #True
用元类实现 单例模式
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转载自blog.csdn.net/dream_is_possible/article/details/79781584
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