code: def attr_names(self):
      return sorted(util.safe_listdir(self._attrs_dir()))
  
imports: import os
  import random
  import threading
  import time
  import uuid
  import yaml
  from guild import opref
  from guild import util
  from guild import yaml_util
label_desc: Use image node_id 19 for calling the Run obj's underlying member method code with example usage: obj.attr_names() and returns: sorted