save project

my_game.py

@@ -72,4 +72,25 @@ while True:
     screen.blit(obstacle, (rect.x, rect.y)) 
     # 刷新画面
     pygame.display.update()
-    FPS.tick(60)
\ No newline at end of file
+    FPS.tick(60)
+
+
+
+
+
+
+
+
+
+    time += 1
+    if time >= 60:
+        time = 0
+        num = randon.randint (0,50)
+        if num >20:
+            obstacle = Block(bush,cacti,stone)
+            block_list.add(obstacle)
+    for sprite in block_list:
+        sprite.rect.x -= 8
+        screen.blit(sprite.image, (sprite.rect.x, sprite.rect.y))
+        if sprite.rect.x <= 0-sprite.rect.width:
+            sprite.kill()