code: def get_user_id():
      """Gets the UUID of the current user.
  
      Returns:
          a tuple of
  
          -   UUID string
          -   True/False whether the UUID was newly created
      """
      uid_path = os.path.join(foc.FIFTYONE_CONFIG_DIR, "var", "uid")
  
      def read():
          try:
              with open(uid_path) as f:
                  return next(f).strip()
          except (IOError, StopIteration):
              return None
  
      if not read():
          os.makedirs(os.path.dirname(uid_path), exist_ok=True)
          with open(uid_path, "w") as f:
              f.write(str(uuid.uuid4()))
  
      return read()
  
label_desc: Use image node_id 1 for calling a global function with example usage: get_user_id() and returns: read, next, None