def is_ambiguous(self, dt):
naive_dst = self._naive_is_dst(dt)<EOL>return (not naive_dst and<EOL>(naive_dst != self._naive_is_dst(dt - self._dst_saved)))<EOL>
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