auto save

snake.py

@@ -59,9 +59,12 @@ while True:
     if x == apple_x and y == apple_y:
         apple_x = random.randint(0,21)*30
         apple_y = random.randint(0,15)*30
+        score += 1
     else:
         position.pop(0)
     if x<0 or x>630 or y<0 or y>450:
+        score -= 3
+    if score == 40:
         exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))
@@ -78,4 +81,4 @@ while True:
     screen.blit(text,(540,10))
     # 刷新画面
     pygame.display.update()
-    FPSCLOCK.tick(1)
\ No newline at end of file
+    FPSCLOCK.tick(4)
\ No newline at end of file