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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def decode(self, hashid):
 """Restore a tuple of numbers from the passed `hashid`. :param hashid The hashid to decode (1, 23, 456) """

        if not hashid or not _is_str(hashid):
            return ()
        try:
            numbers = tuple(_decode(hashid, self._salt, self._alphabet,
                                    self._separators, self._guards))

            return numbers if hashid == self.encode(*numbers) else ()
        except ValueError:
            return ()