更新 'game_functions.py'

game_functions.py

@@ -92,6 +92,15 @@ def check_play_button(ai_settings, screen, stats, sb, play_button, ship, aliens,
         aliens.empty()
         bullets.empty()
 
+        # 清空外星人列表和子弹列表
+        aliens.empty()
+        bullets.empty()
+
         # 创建一群新的外星人，并让飞船居中
         create_fleet(ai_settings, screen, ship, aliens)
-        ship.center_ship()
+        ship.center_ship()
+
+def update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets):
+    """更新子弹的位置，并删除已消失的子弹"""
+    # 更新子弹的位置
+    bullets.update()