code: def find_username():
      domain = os.environ.get("USERDOMAIN")
      username = os.environ.get("USERNAME", "")
      if domain is None:
          return username
      else:
          return f"{domain}\\{username}"
  
imports: import os
  import re
  import uuid
  from xml.etree import ElementTree
  from traitlets import Bool, Enum, Instance, Integer, List, Unicode
  from traitlets.config.configurable import Configurable
label_desc: Use image node_id 3 for calling a global function with example usage: find_username() and returns: username, domain, str, username