Pygame图像缩放失败

我将要调整图像的大小。代码如下:

def display_image(self):
    print('the original size of the image is: ' + str(self.image.get_rect().size))
    self.resize_image(self.image)
    print('the size after resizing is: ' + str(self.image.get_rect().size))
    #some other code in the function

def resize_image(self, image):
    ratio_w = image.get_width()/self.width  #self.width is the width of the screen
    ratio_h = image.get_height()/self.height  #self.height is the height of the screen
    ration = max(ratio_w, ratio_h)
    new_w = image.get_width()/ratio
    new_h = image.get_height()/ration
    image = pygame.transform.scale(image, (int(new_w),int(new_h)))

根据打印结果,图像大小不变。