code: def add(self, sentence_text, **kwargs):
          ''' Parse a text string and add it to this doc '''
          sent = MeCabSent.parse(sentence_text, **kwargs)
          self.sents.append(sent)
          return senf add(self, sentence_text, **kwargs):
          ''' Parse a text string and add it to this doc '''
          sent = MeCabSent.parse(sentence_text, **kwargs)
          self.sents.append(sent)
          return sent
docs: Parse a text string and add it to this doc