save project

my_music.py

@@ -47,10 +47,19 @@ while True:
                     else:
                        play_button = stop_img
                        pygame.mixer.music.unpause()
+                if x > 420 and x < 520 and y > 350 and y < 400:
+                    num -= 1
+                    if num <0:
+                        num = len(music_list)-1
+                    pygame.mixer_music.load(music_list[num])
+                    pygame.mixer_music.play()
+                    chick = 0
+                    play_button = stop_img
     if pygame.mixer_music.get_busy()==False:
         num+=1
         if num > len(filelist)-1:
-            num=0
+            num = 0
+
         pygame.mixer.music.load(filelist[num])
         pygame.mixer_music.play()
     # 绘制画面