如何在pygame中添加一个闪烁的光标？

import pygame
import sys

pygame.init()

window_size = (800, 600)
window = pygame.display.set_mode(window_size)
pygame.display.set_caption("Blinking Cursor")

cursor_pos = (400, 300)
cursor_size = (10, 20)

cursor_color = (255, 255, 255)
cursor_blink = True

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    # 更新光标的闪烁状态
    cursor_blink = not cursor_blink

    # 清空窗口
    window.fill((0, 0, 0))

    # 绘制光标
    if cursor_blink:
        pygame.draw.rect(window, cursor_color, (cursor_pos[0], cursor_pos[1], cursor_size[0], cursor_size[1]))

    # 更新窗口显示
    pygame.display.flip()