save project

snake.py

@@ -64,7 +64,9 @@ while True:
         score += 1
         score += 1
     else:
     else:
         position.pop(0)
         position.pop(0)
-    
+    #不能出墙
+    if y > 630 or y < 0 or x > 450 or x < 0:
+        position.pop(0) 
     # 将背景图画上去
     # 将背景图画上去
     screen.blit(background, (0, 0))
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
     # 将贪吃蛇的头画上去