code: def __reduce__(self):
      return (self.__class__._unpickle, (self._key, self._from_cache))
  
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 16 for calling the ZoneInfo obj's underlying member method code with example usage: obj.__reduce__() and returns: self,  self,  self