save project

snake.py

@@ -65,6 +65,8 @@ while True:
         score += 10
     else:
         position.pop(0) 
+    if x <0 or x >638 or y ,0 or y>450:
+        eslt:
         
     # 将背景图画上去
     screen.blit(background, (0, 0))