code: def kill(self):
      try:
          msg = Message(MessageTypes.SHUTDOWN, None)
          self._emit_msg(msg)
      except:
          pass
  
imports: from __future__ import print_function
  import subprocess
  import fcntl
  import select
  import os
  import sys
  import platform
  from fcntl import F_SETFL
  from os import O_NONBLOCK
  from .sidecar_messages import Message, MessageTypes
  from ..debug import debug
  from metaflow.tracing import inject_tracing_vars
label_desc: Use image node_id 3 for calling the SidecarSubProcess obj's underlying member method code with example usage: obj.kill() without return types