code: def _initialise(cls, cache_dir=None):
      cls._tz_cache = _TzCache()
  
imports: import peewee
  from threading import Lock
  import os
  import appdirs
  import atexit
  import datetime
  import pickle
  from .utils import get_yf_logger
label_desc: Use image node_id 2 for calling the _TzCacheManager obj's underlying member method code with example usage: obj._initialise(cls, cache_dir) without return types