和Arcade街机模块作者的交流email_how to change sprite’s scale dynamicly?

hello, I want to change sprite’s scale , when its moving, below is a example code  :

 

class Effect(arcade.Sprite):

    def __init__(self,x,y):

        super().__init__(“images/lovely_turtle.png”,scale=0.1)

        self.alpha = 50

        self.center_x = x

        self.center_y = y

        self.change_y = 1

        

    def update(self):

        super().update()

        if self.bottom > SCREEN_HEIGHT :self.kill()

        self.scale += 0.1 

 

But it is not change scale when it moving. How can change it size when it moving?