save project

my_game.py

@@ -94,7 +94,7 @@ while True:
     for prop in block_list:
         prop.rect.x -= 8
 # ++++++++++++++++++++++
-    screen.blit(obstacle.image, (obstacle.rect.x, obstacle.rect.y)) 
+        screen.blit(prop.image, (prop.rect.x, prop.rect.y)) 
         if prop.rect.x<=0-prop.rect.width:
             prop.kill()
     # 刷新画面