save project

snake.py

@@ -68,7 +68,7 @@ while True:
     else:
         position.pop(0)
     # 将背景图画上去
-    if x < 0 or x > 630 or y < 0 or y > 450
+    if x < 0 or x > 630 or y < 0 or y > 450:
     
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去