save project

snake.py

@@ -59,8 +59,11 @@ while True:
         num2 = random.randint(1,16)
         apple_x = 30*num1-30
         apple_y = 30*num2-30
+        score += 10
     else:
         position.pop(0)
+    if x < 0 or x > 630 or y < 0 pr y > 450:
+        exit():
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去