save project

my_music.py

@@ -50,7 +50,9 @@ while True:
 
     if pygame.mixer.music.get_busy() == False:
         num+=1
-        if num > len(file)
+        if num > len(filelist)-1:
+            num = 0
+        pygame.mixer.music.load(filelist[num])    
         pygame.mixer.music.play()           
     # 绘制画面
     screen.blit(bg_img, (0, 0))      # 填充背景