auto save

snake.py

 import pygame
 from pygame import locals
-xy = []
+xy = [(180,90),(210,90),(240,90),(270,90)]
 FPS = pygame.time.Clock()
+fx = 'right'
+x = 0
+y = 0
 
 # 初始化pygame，为使用硬件做准备
 pygame.init()
@@ -12,6 +15,9 @@ screen = pygame.display.set_mode((660, 480))
 # 背景
 background = pygame.image.load('bg.png')
 right = pygame.image.load('right.png')
+left = pygame.image.load('left.png')
+up = pygame.image.load('up.png')
+down = pygame.image.load('down.png')
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
 
@@ -21,10 +27,36 @@ while True:
         if event.type == locals.QUIT:
             # 接收到退出事件后退出程序
             exit()
+        if event.type == locals.KEYDOWN:
+            if event.key == K_RIGHT and fx != 'left':
+                fx = 'right'
+            elif event.key == K_LEFT and fx != 'right':
+                fx = 'left'
+            elif event.key == K_UP and fx != 'down':
+                fx = 'up'
+            else:
+                if fx != 'up':
+                    fx = 'down'
+    xy.append((x,y))
+    xy.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
-    screen.blit(right, xy[3])
+    if fx == 'right':
+        screen.blit(right, xy[3])
+        x += 30
+    else:
+        if fx == 'left':
+            screen.blit(left,xy[3])
+            x -= 30
+        else:
+            if fx == 'up':
+                screen.blit(up,xy[3])
+                y -= 30
+            else:
+                screen.blit(down,xy[3])
+                y += 30
+
     # 将贪吃蛇的身体画上去
     screen.blit(body, xy[2])
     screen.blit(body, xy[1])