code: def __enter__(self) -> "PIDClient":
      return self.start()
  
imports: import logging
  import os
  import selectors
  import signal
  import socket
  import subprocess
  import time
  from typing import Any, Callable, Dict, List, Optional, Tuple, Union
  import determined
label_desc: Use image node_id 4 for calling the PIDClient obj's underlying member method code with example usage: obj.__enter__() and returns: self