diff --git a/mm_agents/accessibility_tree_wrap/heuristic_retrieve.py b/mm_agents/accessibility_tree_wrap/heuristic_retrieve.py
index e37f614..9611ea3 100644
--- a/mm_agents/accessibility_tree_wrap/heuristic_retrieve.py
+++ b/mm_agents/accessibility_tree_wrap/heuristic_retrieve.py
@@ -40,7 +40,7 @@ def judge_node(node: ET, platform="ubuntu", check_image=False) -> bool:
                or node.tag.endswith("textfield")\
                or node.tag.endswith("textarea")\
                or node.tag.endswith("menu")\
-               or node.tag in [ "alert", "canvas", "check-box"
+               or node.tag in { "alert", "canvas", "check-box"
                               , "combo-box", "entry", "icon"
                               , "image", "paragraph", "scroll-bar"
                               , "section", "slider", "static"
@@ -48,7 +48,7 @@ def judge_node(node: ET, platform="ubuntu", check_image=False) -> bool:
                               , "netuiribbontab", "start", "trayclockwclass"
                               , "traydummysearchcontrol", "uiimage", "uiproperty"
                               , "uiribboncommandbar"
-                              ]
+                              }
     keeps = keeps and ( platform=="ubuntu"\
                         and node.get("{{{:}}}showing".format(state_ns), "false")=="true"\
                         and node.get("{{{:}}}visible".format(state_ns), "false")=="true"\