pygame - 《Python编程：从入门到实践》第十二章，外星人入侵实例中无法获取键盘按键和退出游戏
game_functions.py
import pygame
import sys
def 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+=10
def 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 pygame
from settings import Settings
from ship import Ship
import game_functions as gf
def 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？
