class_docstr: Implementation of lock with the file system as the backend for synchronization.
  This version patches for the `FileLock._expiry_time` crash(https://github.com/py-sherlock/sherlock/issues/71)
  
  `sherlock.FileLock` might not work as expected for Python threads.
  It uses re-entrant OS locks, meaning that multiple Python threads could acquire the lock at the same time.
  For different processes/OS threads, the file lock will work as expected.
  We need to patch the lock to handle Python threads too.
code: def _acquire_file_lock(self) -> bool:
      if not self._lock_file_enabled:
          return True
  
      owner = str(uuid.uuid4())
  
      # Acquire lock at OS level
      with self._lock_file:
          if self._data_file.exists():
              for _retry in range(10):
                  try:
                      data = json.loads(self._data_file.read_text())
                      break
                  except BaseException:
                      time.sleep(0.1)
                  if _retry == 9:
                      pass
  
              now = self._now()
              has_expired = self._has_expired(data, now)
              if owner != data["owner"]:
                  if not has_expired:
                      # Someone else holds the lock.
                      return False
                  else:
                      # Lock is available for us to take.
                      data = {
                          "owner": owner,
                          "expiry_time": self._expiry_time(),
                      }
              else:
                  # Same owner so do not set or modify Lease.
                  return False
          else:
              data = {
                  "owner": owner,
                  "expiry_time": self._expiry_time(),
              }
  
          # Write new data back to file.
          self._data_file.touch()
          self._data_file.write_text(json.dumps(data))
  
          # We succeeded in writing to the file so we now hold the lock.
          self._owner = owner
  
          return True
  
imports: from collections import defaultdict
  import datetime
  import json
  from pathlib import Path
  import threading
  import time
  from typing import Callable
  from typing import Dict
  from typing import Optional
  import uuid
  from pydantic import BaseModel
  import redis
  from sherlock.lock import BaseLock
  from sherlock.lock import FileLock
  from sherlock.lock import RedisLock
  from ..serde.serializable import serializable
label_desc: Use image node_id 6 for calling the PatchedFileLock obj's underlying member method code with example usage: obj._acquire_file_lock() and returns: True, True, False, False