code: def _render_cell(self, cell):
      if not cell:
          return ""
  
      if isinstance(cell, list):
          return ", ".join(
              self._render_cell(contents) for contents in cell
          )
      else:
          return self._render_t(cell)
  
imports: import abc
  import argparse
  import contextlib
  import difflib
  import enum
  import glob
  import itertools
  import json
  import nbformat
  import os.path
  import re
  import subprocess
  import sys
  import textwrap
label_desc: Use image node_id 5 for calling the Rst obj's underlying member method code with example usage: obj._render_cell(cell) and returns: str, str, self