class_docstr: Read notebook cells from Markdown documents
class_docstr_tok: ["Read","notebook","cells","from","Markdown","documents"]
code: def __init__(self, fmt=None, default_language=None):
      super().__init__(fmt, default_language)
      self.split_at_heading = (fmt or {}).get("split_at_heading", False)
      self.in_region = False
      self.in_raw = False
      if self.format_version in ["1.0", "1.1"] and self.ext != ".Rmd":
          # Restore the pattern used in Markdown <= 1.1
          self.start_code_re = re.compile(r"^```(.*)")
          self.non_jupyter_code_re = re.compile(r"^```\{")
  
imports: import re
  import warnings
  from copy import copy
  from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_raw_cell
  from packaging.version import parse
  from .doxygen import doxygen_to_markdown
  from .languages import _SCRIPT_EXTENSIONS
  from .cell_metadata import is_active, is_json_metadata, rmd_options_to_metadata, text_to_metadata
  from .languages import _JUPYTER_LANGUAGES_LOWER_AND_UPPER
  from .magics import is_magic, need_explicit_marker, uncomment_magic, unescape_code_start
  from .pep8 import pep8_lines_between_cells
  from .stringparser import StringParser
label_desc: Use image node_id 1 to create a new MarkdownCellReader object from inherited base classes: BaseCellReader with example: obj = MarkdownCellReader(fmt, default_language)