save project

snake.py

@@ -62,7 +62,7 @@ while True:
         score+=10
     else:
         position.pop(0)
-    if x<0 and x>630 or y<0 and y>450:
+    if x<0 or x>630 or y<0 or y>450:
         exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))