code: def __str__(self):
      return str(self._asdict())
  
imports: import collections
  from collections import namedtuple
  import logging
  import json
  import random
  import re
  from typing import List
  from stanza.models.classifiers.utils import WVType
  from stanza.models.common.vocab import PAD, PAD_ID, UNK, UNK_ID
  import stanza.models.constituency.tree_reader
label_desc: Use image node_id 3 for calling the SentimentDatum obj's underlying member method code with example usage: obj.__str__() and returns: str