code: def _write_attr(self, root, attr, key):
      s = as_str(getattr(self, attr, ""))
      if s:
          root.set(key, s)
  
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 1 for calling the WinHPCTask obj's underlying member method code with example usage: obj._write_attr(root, attr, key) without return types