在pygame中像这样分层的好方法是什么？

import pygame

class Scene:
    def __init__(self):
        self.layers = []

    def add_layer(self, layer):
        self.layers.append(layer)

    def update(self):
        for layer in self.layers:
            layer.update()

    def draw(self, screen):
        for layer in self.layers:
            layer.draw(screen)

class Layer(pygame.sprite.Group):
    def __init__(self):
        super().__init__()

    def update(self):
        for sprite in self.sprites():
            sprite.update()

    def draw(self, screen):
        self.draw(screen)

class Sprite(pygame.sprite.Sprite):
    def __init__(self, image, position):
        super().__init__()
        self.image = image
        self.rect = self.image.get_rect()
        self.rect.topleft = position

    def update(self):
        # 更新游戏元素的逻辑

    def draw(self, screen):
        screen.blit(self.image, self.rect)

# 游戏初始化
pygame.init()
screen = pygame.display.set_mode((800, 600))
clock = pygame.time.Clock()

# 创建场景和图层
scene = Scene()
background_layer = Layer()
character_layer = Layer()

# 将图层添加到场景中
scene.add_layer(background_layer)
scene.add_layer(character_layer)

# 创建游戏元素
background = Sprite(background_image, (0, 0))
character = Sprite(character_image, (100, 100))

# 将游戏元素添加到对应的图层中
background_layer.add(background)
character_layer.add(character)

# 游戏循环
running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    # 更新场景和图层
    scene.update()

    # 绘制场景和图层
    scene.draw(screen)

    pygame.display.flip()
    clock.tick(60)

pygame.quit()