docstr: Execute a string with one or more lines of code
docstr_tok: ["Execute","a","string","with","one","or","more","lines","of","code"]
code: def run_cell(self, source):
      """Execute a string with one or more lines of code"""
  
      exec(source, self.user_ns)
  
imports: import os
  import re
  import shlex
  import sys
  import pygments
  from pathlib import Path
  from IPython.utils.text import marquee
  from IPython.utils import openpy
  from IPython.utils import py3compat
label_desc: Use image node_id 14 for calling the Demo obj's underlying member method code with example usage: obj.run_cell(source) without return types