code: def is_ambiguous(self, dt):
          
          naive_dst = self._naive_is_dst(dt)
          return (not naive_dst and
                  (naive_dst != self._naive_is_dst(dt - self._dst_saved)))
docs: Whether or not the "wall time" of a given datetime is ambiguous in this
          zone.
  
          :param dt:
              A :py:class:`datetime.datetime`, naive or time zone aware.
  
  
          :return:
              Returns ``True`` if ambiguous, ``False`` otherwise.
  
          .. versionadded:: 2.6.0