auto save

snake.py

 import pygame
 from pygame import locals
-
 # 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()
@@ -12,14 +10,39 @@ background = pygame.image.load('bg.png')
 right = pygame.image.load('right.png')
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
+left = pygame.image.load('left.png')
+up = pygame.image.load('up.png')
+down = pygame.image.load('down.png')
 x,y = 240,120
 position = [(180,90),(180,120),(210,120),(x,y)]
+setheading = "right"
+snake_head = right
 while True:
     for event in pygame.event.get():
         if event.type == locals.QUIT:
             # 接收到退出事件后退出程序
             exit()
-    x  += 30
+    elif event in pygame.event.get():
+        if event.key == locals.K_RIGHT and setheading != "left":
+            setheading = 'right'
+           snake_head = right
+        if event.key == locals.K_LEFT and setheading != "right":
+            setheading = 'left'
+           snake_head = left
+    if event.key == locals.K_UP and setheading != "down":
+            setheading = 'up'
+           snake_head = up
+    if event.key == locals.K_DOWN and setheading != "up":
+            setheading = 'down'
+           snake_head = down
+    if setheading == "right":
+        x  += 30
+    elif setheading == "left":
+        x -= 30
+    elif setheading == "up":
+        y += 30
+    else:
+        y += 30
     position.append((x,y))
     position.pop(0)
     # 将背景图画上去