auto save

snake.py

 import pygame 
+import random
 from pygame import locals
 
 # 初始化pygame，为使用硬件做准备
@@ -14,15 +15,42 @@ food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
 
 x,y=240,120
+apple_x=360
+apple_y=300
 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()
+        if event.type == locals.KEYDOWN:
+           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))
+    if x==apple_x and y==apple_y:
+        apple_x=random.randint(0,660)
+        apple_y=random.randint(0,480)
     position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
@@ -32,7 +60,7 @@ while True:
     for i in range(len(position)-1):
         screen.blit(body,position[i])
     # 将果实画上去
-    screen.blit(food, (360, 300))
+    screen.blit(food, (apple_x, apple_y))
     # 刷新画面
     pygame.display.update()
     FPSCIOCK.tick(3)
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