auto save

snake.py

 import pygame
 from pygame import locals
-
+import random
 # 初始化pygame，为使用硬件做准备
 pygame.init()
 
@@ -18,6 +18,8 @@ down = pygame.image.load('down.png')
 
 
 x, y =  240, 120
+apple_x=360
+apple_y=300
 position = [(180,90),(180,120),(210,120),(x,y)]
 
 setheading = "right"
@@ -32,7 +34,7 @@ while True:
                 setheading = 'right'
             if event.key == locals.K_LEFT and setheading != "right":
                 setheading = 'left'
-            if event.key == locals.K_up and setheading != "down":
+            if event.key == locals.K_UP and setheading != "down":
                 setheading = 'up'
             if event.key == locals.K_DOWN and setheading != "up":
                 setheading = 'down'
@@ -45,8 +47,17 @@ while True:
         y -=30
     else :
         y +=30
+
+
+
     position.append((x, y))
-    position.pop(0)    # 将背景图画上去
+    if x==apple_x and y==apple_y:
+        num1= random.randint(1,22)
+        num2= random.randint(1,16)                                                                                                     #apple_x=random.randint(0,660)
+        apple_x = 30*num1-30
+        apple_y = 30*num2-30                                                                                                                                #apple_y=random.randint(0,480)
+    else:
+        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,position[-1] )
@@ -55,7 +66,7 @@ while True:
         screen.blit(body,position[i])                                                                                                                    #screen.blit(body, (180, 120))
                                                                                                                         #screen.blit(body, (180, 90))
     # 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()
     FPSCLOCK.tick(3)
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