Python version of https://docs.unrealengine.com/en-US/ProductionPipelines/ScriptingAndAutomation/Blueprints/StartupObjects/index.html

unreal_on_asset_import.py

import unreal


@unreal.uclass()
class OnAssetPostImportAction(unreal.EditorUtilityObject):
    @unreal.ufunction(override=True)
    def run(self):
        """ Add a callable static function to be called whenever an asset is
        imported.

        """
        # Get the Import Subsystem,
        import_subsytem = unreal.get_editor_subsystem(unreal.ImportSubsystem)

        # Add a callable to the OnAssetPostImport delegate,
        import_subsytem.on_asset_post_import.add_callable(
            OnAssetPostImportAction.log_import_name
        )

    @unreal.ufunction(static=True, params=[unreal.Factory, unreal.Object], meta=dict(BlueprintEvent=True))
    def log_import_name(factory, created_object):
        """ Static function that should print asset name whenever a new asset is 
        imported.

        :param factory: the factory class used for import
        :type factory: unreal.Factory
        :param created_object: the imported asset,
        :type created_object: unreal.Object

        """
        print("Hello %s" % created_object.get_name())


def main():
    # Execute the run function for our Editor Utility Object,
    OnAssetPostImportAction().run()


if __name__ == '__main__':
    main()

Not really the forum for this, but try looking at scoped slow tasks

i know the scoped slow tasks, but i mean
like this forum "StartupObjects/index.html" what we talk ,
if it run ,it will run a long time to "print("Hello %s" % created_object.get_name())" when i import some assets
but with UE running, i want it stop, stop this code running， back to the time i can import assets without this code by my thought
it is the question i think a lot ,when i keep develop this forum.
Sorry to occupy your time.