code: def __repr__(self):
      return f"{self.__class__.__name__}(content={repr(str(self))})"
  
imports: from collections import namedtuple
  from functools import partial, wraps
  from nltk.corpus.reader.api import CategorizedCorpusReader
  from nltk.corpus.reader.plaintext import PlaintextCorpusReader
  from nltk.corpus.reader.util import concat, read_blankline_block
  from nltk.tokenize import blankline_tokenize, sent_tokenize, word_tokenize
label_desc: Use image node_id 2 for calling the MarkdownBlock obj's underlying member method code with example usage: obj.__repr__() and returns: self, str, repr, str