[Blender Python] Add an asset from the User Asset Library into the scene (vidoe explination https://www.skool.com/cgpython/make-a-button-to-add-a-model?p=abc92a32)

add_asset_from_user_asset_lib.py

import pathlib
import bpy


def find_user_asset_dir():
    user_lib_index = bpy.context.preferences.filepaths.asset_libraries.find("User Library")
    if user_lib_index == -1:
        return None
    
    user_asset_lib = bpy.context.preferences.filepaths.asset_libraries[user_lib_index]
    return user_asset_lib.path


class ImportManOperator(bpy.types.Operator):
    bl_idname = "import_scene.man_asset"
    bl_label = "Import Man Model"

    def execute(self, context):
        user_asset_dir = find_user_asset_dir()
        if user_asset_dir is None:
            self.report({'ERROR'}, "User Asset Library not found")
            return {'CANCELLED'}
        
        # TODO: Update the name of the blend file that you want to use
        file_path = pathlib.Path(user_asset_dir) / "man.blend"
        if not file_path.exists():
            self.report({'ERROR'}, f"File not found: {file_path}")
            return {'CANCELLED'}
    
        with bpy.data.libraries.load(str(file_path)) as (data_from, data_to):
            for name in data_from.objects:
                if name == "man":
                    data_to.objects = [name]
                
        scene = bpy.context.scene
        # link the objects into the scene collection
        for obj in data_to.objects:
            if obj is None:
                continue
            scene.collection.objects.link(obj)

        return {'CANCELLED'}


class VIEW3D_PT_my_custom_panel(bpy.types.Panel):  # class naming convention ‘CATEGORY_PT_name’

    # where to add the panel in the UI
    bl_space_type = "VIEW_3D"  # 3D Viewport area (find list of values here https://docs.blender.org/api/current/bpy_types_enum_items/space_type_items.html#rna-enum-space-type-items)
    bl_region_type = "UI"  # Sidebar region (find list of values here https://docs.blender.org/api/current/bpy_types_enum_items/region_type_items.html#rna-enum-region-type-items)

    bl_category = "My Custom Panel category"  # found in the Sidebar
    bl_label = "My Custom Panel label"  # found at the top of the Panel

    def draw(self, context):
        """define the layout of the panel"""
        row = self.layout.row()
        row.operator("import_scene.man_asset", text="Add Man")



def register():
    bpy.utils.register_class(ImportManOperator)
    bpy.utils.register_class(VIEW3D_PT_my_custom_panel)


def unregister():
    bpy.utils.unregister_class(VIEW3D_PT_my_custom_panel)
    bpy.utils.unregister_class(ImportManOperator)


if __name__ == "__main__":
    register()