save project

my_game.py

 import pygame
+import random
 from pygame import locals
 
 pygame.init()  # 初始化
@@ -23,6 +24,7 @@ jumpState="running"
 y=400
 t=36
 
+new_stone=random.choice([stone,cacti,apple])
 stone_x=1000
 
 while True:
@@ -59,10 +61,11 @@ while True:
     screen.blit(background, (0, 0))
     screen.blit(road, (0, 500))
     screen.blit(hero[index], (150, y))
-    screen.blit(stone,(stone_x,400))
+    screen.blit(new_stone,(stone_x,400))
 
     if stone_x<-200:
         stone_x=1000
+        new_stone=random.choice([stone,cacti,apple])
     stone_x-=20
 
     # 刷新画面