save project

my_Tetris.py

@@ -28,7 +28,7 @@ while True:
             elif event.key==locals.K_LEFT:
                 if centre[1]>1:
                     centre[1]-=1
-            else:
+            elif event.key==locals.K_DOWN:
                 if centre[0]<25:
                     centre[0]+=1
     # 将背景图画上去