import timeclass AD():    pass    def __init__(self,content,direction,speed):        self.content = content        self.direction = direction        self.speed = speed    def start(self):        while True:            print(self.content, end='\r')            if self.direction == "1":                self.content = self.content[1:]+self.content[0]            elif self.direction == '2':                self.content = self.content[-1]+self.content[:-1]            if self.speed == "快":                time.sleep(0.25)            elif self.speed == '中':                time.sleep(0.5)            elif self.speed == '慢':                time.sleep(1)if __name__ == "__main__":    content = input('请输入广告语: ')    direction = input('请选择方向, 从右往左请选1, 从左往右请选2... ')    speed = input('请选择滚动速度: 快, 中, 慢... ')                ad = AD(content,direction,speed)    ad.start()复制代码

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