code: def __str__(self):
      if self._key is not None:
          return f"{self._key}"
      else:
          return repr(self)
  
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 14 for calling the ZoneInfo obj's underlying member method code with example usage: obj.__str__() and returns: self, repr