code: def _get_per_user_string():
      try:
          from os import getuid
      except ImportError:
          checksum = _new_md5()
          from os import environ
  
          checksum.update(environ["USERNAME"].encode("utf-8"))
          return checksum.hexdigest()
      else:
          return "uid%d" % getuid()
  
imports: from pytools import memoize
  import os
  import sys
  from tempfile import mkstemp
  from os import unlink
  from pytools.prefork import call_capture_output
label_desc: Use image node_id 5 for calling a global function with example usage: _get_per_user_string() and returns: unknown, checksum