save project

snake.py

@@ -26,8 +26,6 @@ position = [(180, 90), (180, 120), (210, 120), (x, y)]
 setheading = "right"
 snake_head = right
 score=0
-if x<0 or x>630 or y<0 or y>450:
-    exit()
 while True:
     for event in pygame.event.get():
         if event.type == locals.QUIT:
@@ -64,6 +62,8 @@ while True:
         apple_y=30*m-30
     else:
         position.pop(0)
+    if x<0 or x>630 or y<0 or y>450:
+        exit()
     position.append((x, y))
     # 将背景图画上去
     screen.blit(background, (0, 0))