code: def __iter__(self):
      for sent in self.sents:
          for tok in sent:
              yield tok
  
file_path: scattertext/scattertext/WhitespaceNLP.py
imports: import re
  from scattertext.emojis.ProcessedEmojiStructure import VALID_EMOJIS
label_desc: Use image node_id 4 for calling the Doc obj's underlying member method code with example usage: obj.__iter__() without return types