auto save

snake.py

 import pygame
 from pygame import locals
-x,y=240,120
 # 初始化pygame，为使用硬件做准备
 pygame.init()
 fpsclock=pygame.time.Clock()
@@ -12,21 +11,50 @@ 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'
 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
+        if event.type == locals.KEYDOWN: 
+            if event == locals.K_RIGHT and setheading !='left':
+                setheading ='right'
+                snake_right=right
+            if event == locals.K_LEFT and setheading !='right':
+                setheading ='lift'
+                snake_right=lift
+            if event == locals.K_UP and setheading !='down':
+                setheading ='up'
+                snake_right=up
+            if event == locals.K_DOWN and setheading !='up':
+                setheading ='down'
+                snake_right=down
+    
+    if setheading =='right':
+        x +=30 
+    elif setheading =='lift':
+        x -=30
+    elif setheading =='up':
+        y +=30
+    else:
+        y -=30
+    position.append((x,y))
+    position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
     screen.blit(right, (x, y))
     # 将贪吃蛇的身体画上去
-    screen.blit(body, (210, 120))
-    screen.blit(body, (180, 120))
-    screen.blit(body, (180, 90))
+    for i in range(len(position)-1):
+        screen.blit(body, position[i])
+    
     # 将果实画上去
     screen.blit(food, (360, 300))
     # 刷新画面