from abc import ABCMeta, abstractmethod
from time import sleep


class Window(metaclass=ABCMeta):
    """定义抽象的原子操作 / 钩子操作，需要在子类实现"""

    @abstractmethod
    def start(self):
        pass

    @abstractmethod
    def repaint(self):
        pass

    @abstractmethod
    def stop(self):
        pass

    def run(self):
        """模板方法 (运行逻辑不用重写)"""

        self.start()

        while True:
            try:
                self.repaint()
                sleep(1)
            except KeyboardInterrupt:
                break

        self.stop()


class MyWindow(Window):
    def __init__(self, msg):
        self.msg = msg

    def start(self):
        print('窗口开始运行')

    def stop(self):
        print('窗口结束运行')

    def repaint(self):
        print(self.msg)


MyWindow('Hello...').run()