code: def __init__(self, heading, level, *args):
      self.heading = heading
      self.level = level
      super().__init__(*args)
  
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 1 to create a new MarkdownSection object from inherited base classes: MarkdownBlock with example: obj = MarkdownSection(heading, level)