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()
 
@@ -20,6 +20,8 @@ down = pygame.image.load('down.png')        # 头 朝下
 x, y = 240, 120
 position = [(180, 90), (180, 120), (210, 120), (x, y)]
 
+apple_x = 300
+apple_y = 300
 setheading = "right"
 snake_head = right
 
@@ -51,8 +53,14 @@ while True:
         y -= 30
     else:
         y += 30
-    position.append((x, y))
+    
     position.pop(0)
+    if apple_x == x and apple_y == y:
+        apple_x = random.randint(0,22)*30 - 30
+        apple_y = random.randint(0,16)*30 - 30
+        
+    else:
+        position.append((x, y))
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
@@ -62,7 +70,7 @@ while True:
         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()
     FPSCLOCK.tick(3)
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