set_material of StaticMeshComponent doesn't work in python

Development Programming & Scripting
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1

I want to assign different material instance for each StaticMeshComponent. First, set material for StaticMeshComponent, then set material.
I’ve tried different ways, set override_materials property, or set_material(0, material). Nothing happened. Also, get_material_slot_names returns [], get_num_materials returns 0. but there are two material slots in the mesh asset.

children_components = root_component.get_children_components(False)
    for child_component in children_components:
        if not isinstance(child_component, unreal.StaticMeshComponent):
            continue
        components.append(child_component)
        child_component.set_editor_property('static_mesh', mesh_asset)
        print(child_component.get_material_slot_names())
        print(child_component.get_num_materials())
        child_component.set_editor_property('override_materials', [material_example, material_example])