save project

snake.py

@@ -61,8 +61,10 @@ 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  or y>450:
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去