save project

my_music.py

-import pygame
+import pygame 
 from pygame import locals
 
 pygame.init()  # 初始化
@@ -49,6 +49,23 @@ while True:
                 else:
                     play_button = play_img
                     pygame.mixer.music.pause()
+            if x > 120 and x < 220 and  y < 400
+               num -= 1
+               if num < 0
+                  num = len(music_list) -1
+               pygame.mixer.music.load(path+"\\"+music_list[num])
+               pygame.mixer.music.play()
+               play_button = stop_img
+               chick = 0
+            if x > 420 and x < 520 and y >350 and y < 400
+                num += 1
+                if num > len(music_list) -1:
+                    num = 0
+                pygame.mixer.music.load(path+"\\"+music_list[num])
+                pygame.mixer.music.play()
+                play_button = stop_img
+                chick = 0
+                 
 
     if pygame.mixer.music.get_busy() == False:
         pygame.mixer.music.play()