auto save

snake.py

 import pygame
+import random
 from pygame import locals
 
 # 初始化pygame，为使用硬件做准备
@@ -19,9 +20,9 @@ down = pygame.image.load('down.png')        # 头 朝下
 
 x, y = 240, 120
 position = [(180, 90), (180, 120), (210, 120), (x, y)]
-
-setheading = "right"
-snake_head = right
+setheading = right      #状态，并不直接控制移动
+apple_x=360
+apple_y=300
 
 while True:
     for event in pygame.event.get():
@@ -29,40 +30,45 @@ while True:
             # 接收到退出事件后退出程序
             exit()
         if 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 event.key == locals.K_RIGHT and setheading != left:
+                setheading = right
+                
+            if event.key == locals.K_LEFT and setheading != right:
+                setheading = left
+               
+            if event.key == locals.K_UP and setheading != down:
+                setheading = up
+                
+            if event.key == locals.K_DOWN and setheading != up:
+                setheading = down
+               
 
     # 设置贪吃蛇的头部坐标
-    if setheading == "right":
+    if setheading == right:
         x += 30
-    elif setheading == "left":
+    elif setheading == left:
         x -= 30
-    elif setheading == "up":
+    elif setheading == up:
         y -= 30
     else:
         y += 30
     position.append((x, y))
     position.pop(0)
+
+    if x==apple_x and y==apple_y:
+        apple_x=random
+        apple_y=random
+
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
-    screen.blit(snake_head, position[-1])
+    screen.blit(setheading, position[-1])
     # 将贪吃蛇的身体画上去
     for i in range(len(position)-1):
         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)
\ No newline at end of file
+    FPSCLOCK.tick(5)
\ No newline at end of file