Link Frame Handler #Blender

link_frame_handler.py

import bpy

C = bpy.context
scene = C.scene

# path to the blend
filepath = "C:\\Users\\poor\\Desktop\\assets.blend"
prefix = "RNDR"


# link all objects starting with RNDR
with bpy.data.libraries.load(filepath, link=True) as (data_from, data_to):
    data_to.objects = [name for name in data_from.objects if name.startswith(prefix)]

object_dict = {}
for c, o in enumerate(data_to.objects, start=1):
    object_dict[c] = o


def unlink_obj(scene):
    coll = C.view_layer.active_layer_collection.collection
    objs = [c for c in coll.objects if c.name.startswith(prefix)]
    for obj in objs:
        coll.objects.unlink(obj)


def link_obj(scene):
    coll = C.view_layer.active_layer_collection.collection
    obj = object_dict.get(scene.frame_current)
    if obj:
        coll.objects.link(obj)


bpy.app.handlers.frame_change_pre.clear()
bpy.app.handlers.frame_change_post.clear()      
bpy.app.handlers.frame_change_pre.append(unlink_obj)
bpy.app.handlers.frame_change_post.append(link_obj)