docstr: Execute user code. Must be overridden by subclasses.
          
docstr_tok: ["Execute","user","code",".","Must","be","overridden","by","subclasses","."]
code: def do_execute(
      self,
      code,
      silent,
      store_history=True,
      user_expressions=None,
      allow_stdin=False,
  ):
      """Execute user code. Must be overridden by subclasses."""
      raise NotImplementedError
  
imports: from __future__ import print_function
  import sys
  import time
  import logging
  import uuid
  from datetime import datetime
  from signal import signal, default_int_handler, SIGINT
  import zmq
  from tornado import ioloop
  from zmq.eventloop.zmqstream import ZMQStream
  from traitlets.config.configurable import SingletonConfigurable
  from IPython.core.error import StdinNotImplementedError
  from ipython_genutils import py3compat
  from ipython_genutils.py3compat import unicode_type, string_types
  from ipykernel.jsonutil import json_clean
  from traitlets import Any, Instance, Float, Dict, List, Set, Integer, Unicode, Bool, observe, default
  from jupyter_client.session import Session
  from ._version import kernel_protocol_version
label_desc: Use image node_id 20 for calling the Kernel obj's underlying member method code with example usage: obj.do_execute(code, silent, store_history, user_expressions, allow_stdin) without return types