如何在pygame中删除矩形？

import pygame
import sys

# 初始化pygame
pygame.init()

# 设置窗口大小和标题
screen_width, screen_height = 800, 600
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("删除矩形示例")

# 创建矩形对象
rect_width, rect_height = 100, 100
rect = pygame.Rect(100, 100, rect_width, rect_height)

# 游戏主循环
while True:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_DELETE:
                # 删除矩形
                pygame.draw.rect(screen, (0, 0, 0), rect)
                pygame.display.update()

    # 绘制矩形
    pygame.draw.rect(screen, (255, 0, 0), rect)
    pygame.display.update()