python singleton instance with qwindow

단일 창을 활용하고 싶을 때,

싱클턴 클래스 작성

class SingletonInstance:
    __instance = None

    @classmethod
    def get_Instance(self):
        return self.__instance

    @classmethod
    def instance(self):
        print("instance")
        if self.__instance ==None:
            self.__instance = self()
        else:
            self.instance = self.get_Instance

        return self.__instance

class ChartWindow(QMainWindow, SingletonInstance):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        self.kiwoom = KiwoomApi()

    def __del__(self):
        self.__instance = None

싱클턴 클래스를 상속 받아 활용.

self.chart_window = ChartWindow.instance()