code: def _get_pid(self):
      lockfile = self.guild_path("LOCK")
      try:
          raw = open(lockfile, "r").read(10)
      except (IOError, ValueError):
          return None
      else:
          try:
              return int(raw)
          except ValueError:
              return None
  
imports: import os
  import random
  import threading
  import time
  import uuid
  import yaml
  from guild import opref
  from guild import util
  from guild import yaml_util
label_desc: Use image node_id 11 for calling the Run obj's underlying member method code with example usage: obj._get_pid() and returns: None, int, None