code: def parse_markdown_cells(notebook):
      def cell(c):
          if c.cell_type == "markdown":
              return MarkdownCell(c)
          return c
  
      return [cell(c) for c in notebook.cells]
  
imports: import argparse
  import commonmark
  import nbformat
  import os
  import re
  import subprocess
  import sys
  import textwrap
  from pathlib import Path
label_desc: Use image node_id 3 for calling a global function with example usage: parse_markdown_cells(notebook) and returns: unknown, c, MarkdownCell