code: def number_lines(lines, first_num):
      # indent the code (so it markdowns as a code block) and give it line numbers
      return "\n".join(
          f"    {line_num:3} | {line}"
          for line_num, line in enumerate(lines, start=first_num)
      )
  
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 2 for calling a global function with example usage: number_lines(lines, first_num) and returns: str