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()
 
@@ -22,6 +22,8 @@ position = [(180, 90), (180, 120), (210, 120), (x, y)]
 
 setheading = "right"
 snake_head = right
+apple_x = 360
+apple_y= 300
 
 while True:
     for event in pygame.event.get():
@@ -52,8 +54,16 @@ while True:
     else:
         y += 30
     position.append((x, y))
+    if x==apple_x and y==apple_y:
+        num1= random.randint(1,22)
+        num2= random.randint(1,16)
+        apple_x=num1*30-30
+        apple_y=num2*30-30
+    else:
         position.pop(0)
-    # 将背景图画上去
+    if x<0 or x>630 or y>450 or y<0:
+        exit()
+    # 将背景图画上
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
     screen.blit(snake_head, position[-1])
@@ -62,7 +72,7 @@ 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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