ASC - Export Script

import bpy

objects = bpy.context.scene.objects

for obj in objects:
    obj.select_set(obj.type == "MESH")

for obj in bpy.context.selected_objects :
    for uvmap in  obj.data.uv_layers :
        uvmap.name = 'UVMap'
bpy.ops.object.select_all(action='DESELECT')

obj_list = []


for mat in bpy.data.materials:
    if("material_1" not in mat.name):
        print("Processing {0}".format(mat.name))
        bpy.ops.object.select_all(action='DESELECT')
        for o in bpy.data.objects:
            for m in o.material_slots:
                if mat.name in m.name:
                    obj_list.append(o)
                    o.select_set(True)
        if(len(obj_list) > 1):
            bpy.context.view_layer.objects.active = obj_list[0]
            bpy.ops.object.join()
        bpy.context.active_object.name = mat.name
        bpy.ops.object.select_all(action='DESELECT')
        obj_list.clear()
        obj_list = []

bpy.ops.object.select_all(action='DESELECT')
for obj in objects:
    obj.select_set(obj.type == "EMPTY")
    bpy.ops.object.delete()