auto save

snake.py

 import pygame
 from pygame import locals
-import random
-# 初始化pygame，为使用硬件做准备
-pygame.init()
-# 创建一个窗口
-screen = pygame.display.set_mode((660, 480))
-FPSCLOCK = pygame.time.Clock()  # pygame时钟，控制游戏速度（帧数）
-# 背景
 background = pygame.image.load('bg.png')
 right = pygame.image.load('right.png')      # 头 朝右
 food = pygame.image.load('apple.png')       # 食物 苹果
@@ -39,8 +32,7 @@ while True:
             if event.key == locals.K_DOWN and setheading != "up":
                 setheading = 'down'
                 snake_head = down
-    if x<0 or x>630 or y<0 or y>450:
-        exit()
+    
     # 设置贪吃蛇的头部坐标
     if setheading == "right":
         x += 30
@@ -59,19 +51,26 @@ while True:
         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])
+
     # 将贪吃蛇的身体画上去
     for i in range(len(position)-1):
         screen.blit(body, position[i])
+
     # 将果实画上去
     screen.blit(food, (apple_x, apple_y))
+
     # 刷新画面
     info = 'Score:'+str(score)
     text = my_font.render(info,True,(0,0,0))
     screen.blit(text,(540,10))
     pygame.display.update()
-    FPSCLOCK.tick(3)
\ No newline at end of file
+    FPSCLOCK.tick(30)
\ No newline at end of file