auto save

my_music.py

@@ -23,14 +23,17 @@ while True:
         if event.key == locals.K_UP:
             volume += 0.1
             if volume > 1:
-                volume = 1
+                volume == 1
             pygame.mixer.music.set_volume(volume)
         if event.key == locals.K_DOWN:
             volume -= 0.1
             if volume < 0:
-                volume = 0
+                volume == 0
             pygame.mixer.music.set_volume(volume)
-
+   
+    
+    if pygame.mixer.music.get_busy() == False:
+        pygame.mixer.music.play()
 
     # 绘制画面
     screen.blit(bg_img, (0, 0))      # 填充背景