save project

snake.py

 import pygame
 from pygame import locals
+import random
 
 # 初始化pygame，为使用硬件做准备
 pygame.init()
@@ -19,6 +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 = 360
+apple_y = 300
 
 setheading = "right"
 snake_head = right
@@ -52,9 +55,16 @@ while True:
     else:
         y += 30
     position.append((x, y))
-    position.pop(0)
-    # 将背景图画上去
+        num1=random.randint(1,22)
+        num2=random.randint(1,16)
+        apple_x = 30*num1-30
+        apple_y = 30*num2-30
+    else:
+        position.pop(0)
+
     screen.blit(background, (0, 0))
+    if x <0or x>630or y<0or y>450:
+        exit()
     # 将贪吃蛇的头画上去
     screen.blit(snake_head, position[-1])
     # 将贪吃蛇的身体画上去