Python编程从入门到实践第12章，外星人入侵实例中无法获取键盘按键，python第12章,game_functio

Python编程从入门到实践第12章，外星人入侵实例中无法获取键盘按键，python第12章,game_functio

game_functions.py

import pygameimport sysdef check_enents(ship):    """响应按键和鼠标事件"""    for event in pygame.event.get():        if event == pygame.QUIT:            sys.exit()        elif event == pygame.KEYDOWN:            if event == pygame.K_d:                ship.rect.centerx+=10def update_screen(ai_settings,screen,ship):    """更新屏幕上的图像"""    # 重绘屏幕    screen.fill(ai_settings.bg_color)    ship.blitme()    pygame.display.flip()

alien_invasion.py

import pygamefrom settings import Settingsfrom ship import Shipimport game_functions as gfdef run_game():    # 初始化游戏，创建屏幕对象    pygame.init()    ai_settings=Settings()  # 创建设置实例    screen=pygame.display.set_mode((ai_settings.screen_width,ai_settings.screen_height))    ship=Ship(screen)    pygame.display.set_caption("Alien Invasion")    # 开始游戏主循环    while True:        gf.check_enents(ship)        gf.update_screen(ai_settings,screen,ship)run_game()

只能强行终止进程，按红叉无法退出，按d后也没办法向右移动，代码和书上基本一样，求教是哪里错了，和OS X系统有关系么？

编橙之家文章，