save project

my_music.py

@@ -49,7 +49,9 @@ while True:
 
         # 按下鼠标
         if x>120 and x<220 and y>350 and y<250:
-            
+            num-=1
+            if num<0:
+                num=len(music_list)
         if event.type == locals.MOUSEBUTTONDOWN:
             if event.button==1
                 x,y=event.pos