Pygame如何在不删除任何其他内容的情况下更改背景颜色

import pygame

pygame.init()

screen = pygame.display.set_mode((width, height))

background_color = (r, g, b)
screen.fill(background_color)

pygame.display.flip()

import pygame

# 初始化Pygame
pygame.init()

# 创建窗口
width = 800
height = 600
screen = pygame.display.set_mode((width, height))

# 设置背景颜色
background_color = (255, 255, 255)
screen.fill(background_color)

# 刷新窗口
pygame.display.flip()

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

# 退出游戏
pygame.quit()