code: def list_devices():
      return ["host"]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import copy
  import os
  import re
  import subprocess
  import random
  import tempfile
  from utils import util
label_desc: Use image node_id 2 for calling the HostDevice obj's underlying member method code with example usage: obj.list_devices() and returns: list