a lot of stuff

Content/Python/basic_scripting_demo/1.py

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+import unreal
+
+sub = unreal.get_editor_subsystem(unreal.EditorActorSubsystem)
+actors = sub.get_all_level_actors()
+unreal.log(f"{len(actors)} actors in level")

Content/Python/basic_scripting_demo/2.py

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+import unreal
+
+OLD = unreal.load_asset("/Game/ImportedAssets/Trees/SM_tree04.SM_tree04")
+NEW = unreal.load_asset("/Game/ImportedAssets/Trees/SM_tree01.SM_tree01")
+
+sub = unreal.get_editor_subsystem(unreal.EditorActorSubsystem)
+actors = sub.get_all_level_actors()
+
+old_mesh_count = 0
+
+for actor in actors:
+    comp = actor.get_component_by_class(unreal.StaticMeshComponent)
+    if comp and comp.static_mesh == OLD:
+        old_mesh_count += 1
+
+print(f"Found {old_mesh_count} instances of the old mesh")

Content/Python/basic_scripting_demo/3.py

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+import unreal
+
+OLD = unreal.load_asset("/Game/ImportedAssets/Trees/SM_tree04.SM_tree04")
+NEW = unreal.load_asset("/Game/ImportedAssets/Trees/SM_tree01.SM_tree01")
+
+sub = unreal.get_editor_subsystem(unreal.EditorActorSubsystem)
+actors = sub.get_all_level_actors()
+
+old_mesh_count = 0
+
+with unreal.ScopedEditorTransaction("Swap meshes"):
+    for actor in actors:
+        comp = actor.get_component_by_class(unreal.StaticMeshComponent)
+        if comp and comp.static_mesh == OLD:
+            comp.set_editor_property("static_mesh", NEW)
+            # comp.set_static_mesh(NEW) -- tak tez mozna ale undo nie zadziala bo zmiana nie jest robiona przez edytor wiec jej on nie rejestruje
+            old_mesh_count += 1
+
+unreal.log(f"Swapped {old_mesh_count} meshes")