auto save

snake.py

 import pygame
 from pygame import locals# 初始化pygame，为使用pygame做准备
-pygame.init()
-x,y=240,120
-# 创建一个窗口
 screen = pygame.display.set_mode((660,480))
-FPSCLOCK = pygame.time.Clock()
-background = pygame.image.load('bg.png') 
-right = pygame.image.load('right.png')
-food = pygame.image.load('apple.png')
-body = pygame.image.load('body.png')
+FPSCLOCK=pygame.time.Clock()
+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:
+        if event.type==locals.QUIT:
             exit()
-    x +=30
+        elif 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))
+    position.pop(0)
     screen.blit(background,(0,0))
-    screen.blit(right,(x,y))
-    screen.blit(body,(210,120))
-    screen.blit(body,(180,120))
-    screen.blit(body,(180,90))
+    screen.blit(right,position[-1])
+    for i in range(len(position)-1):
+        screen.blit(body,position[i])
     screen.blit(food,(360,300))
     pygame.display.update()
     FPSCLOCK.tick(3)
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-
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