Python 设计模式总结

class Singleton(object):
    def __new__(cls, *args, **kwargs):
        if not hasattr(cls, '_insurance'):
            cls._insurance = super(Singleton, cls).__new__(
                cls, *args, **kwargs)

        return cls._insurance


if __name__ == '__main__':
    s1 = Singleton()
    s2 = Singleton()
    print(s1)
    print(s2)

<__main__.Singleton object at 0x1019f6320>
<__main__.Singleton object at 0x1019f6320>