code: def cell_source(cell):
      return "".join(cell.source)
  
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 1 for calling a global function with example usage: cell_source(cell) and returns: str