Pygame,如何在屏幕上绘制一个形状并删除前一个表面？

pip install pygame

import pygame

pygame.init()

screen_width = 800
screen_height = 600
screen = pygame.display.set_mode((screen_width, screen_height))

def draw_rectangle(surface, color, rect):
    pygame.draw.rect(surface, color, rect)

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

    # 用背景色填充整个屏幕
    screen.fill((255, 255, 255))

    # 绘制矩形
    rect = pygame.Rect(100, 100, 200, 200)
    draw_rectangle(screen, (255, 0, 0), rect)

    # 更新屏幕
    pygame.display.update()

pygame.quit()