如何在这个pygame程序中移动图片？

import pygame
import sys

pygame.init()

screen = pygame.display.set_mode((800, 600))
pygame.display.set_caption("Moving Image")

image = pygame.image.load("image.png")

image_rect = image.get_rect()
image_rect.center = (400, 300)

clock = pygame.time.Clock()

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

    # 检测按键状态
    keys = pygame.key.get_pressed()
    if keys[pygame.K_LEFT]:
        image_rect.x -= 5
    if keys[pygame.K_RIGHT]:
        image_rect.x += 5
    if keys[pygame.K_UP]:
        image_rect.y -= 5
    if keys[pygame.K_DOWN]:
        image_rect.y += 5

    # 清空屏幕
    screen.fill((255, 255, 255))

    # 绘制图片
    screen.blit(image, image_rect)

    # 更新屏幕
    pygame.display.flip()

    # 控制帧率
    clock.tick(60)