save project

snake.py

@@ -57,10 +57,11 @@ while True:
     if x==apple_x and y==appie_y:
         apple_x=random.randint(0,21)*30
         apple_y=random.randint(0,17)*30
-        score+=1000000000000000000000000000000000000000000000000000000000000000000000
+        score+=10
     else:   
         position.pop(0)
-    # 将背景图画上去
+    if x<0 or x>630 or y<0 or y >450:
+    exit()    # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
     screen.blit(snake_head, position[-1])