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Python の Singleton

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いつも忘れるので。メモとして。(エキスパート Python から引用)
class MySingletonClass(object):

    def __new__(clsObj, *args, **kwargs):
        if not hasattr(clsObj, "__instance__"):
            clsObj.__instance__ = super(MySingletonClass,
        return clsObj.__instance__


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