code: def __init_subclass__(cls):
      cls._strong_cache = collections.OrderedDict()
      cls._weak_cache = weakref.WeakValueDictionary()
  
imports: import bisect
  import calendar
  import collections
  import functools
  import re
  import weakref
  from datetime import datetime, timedelta, tzinfo
  from .None import _common, _tzpath
label_desc: Use image node_id 1 for calling the ZoneInfo obj's underlying member method code with example usage: obj.__init_subclass__(cls) without return types