save project

snake.py

@@ -53,6 +53,8 @@ while True:
         score=score+10
     else:
         position.pop(0)
+    if x<0 or x>630 or y<0 or y>450:
+        break
     screen.blit(background, (0, 0))
     screen.blit(snake_head, position[-1])
     for i in range(len(position)-1):