save project

my_game.py

@@ -91,6 +91,8 @@ while True:
     for obstacle in block_list:
         obstacle.rect.x -= 8
         screen.blit(obstacle.image, (obstacle.rect.x,obstacle.rect.y)) 
+        if obstacle.rect.x <= 0- obstacle.rect.width:  
+            obstacle.kill()
     # 刷新画面
     pygame.display.update()
     FPS.tick(60)
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