Beginner Blender Python tutorial code for linking objects, materials, and scens from one .blend file into another (tutorial video: https://youtu.be/ZrN9w8SMFjo)

linking_objects_materials_scens_between_blend_files.py

# extend Python's functionality to work with file paths
import pathlib

# give Python access to Blender's functionality
import bpy


def remove_libraries():
    """remove the linked blend files"""
    bpy.data.batch_remove(bpy.data.libraries)


def link_blend_file_objects(blend_file_path, link=False):
    """link the blender file objects into the current blender file"""
    with bpy.data.libraries.load(blend_file_path, link=link) as (data_from, data_to):
        data_to.objects = data_from.objects

    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)


def link_blend_file_scenes(blend_file_path, link=False):
    """link the blender file scenes into the current blender file"""
    with bpy.data.libraries.load(blend_file_path, link=link) as (data_from, data_to):
        data_to.scenes = data_from.scenes


def link_blend_file_materials(blend_file_path, link=False):
    """link the blender file materials into the current blender file"""
    with bpy.data.libraries.load(blend_file_path, link=link) as (data_from, data_to):

        for material_name in data_from.materials:
            if "blue" in material_name:
                data_to.materials.append(material_name)


def main():
    remove_libraries()

    # define the path to the blend file
    blend_file_path = str(pathlib.Path().home() / "tmp" / "objects.blend")

    link_blend_file_objects(blend_file_path, link=True)


main()