@query
    def __contains__(self, member):
        """:keyword:`in` operator.  Tests whether the set contains
        the given operand ``member``.

        :param member: the value to test
        :returns: ``True`` if the sorted set contains the given
                  operand ``member``
        :rtype: :class:`bool`

        .. note::

           This method internally uses :redis:`ZSCORE` command.

        """
        try:
            element = self.value_type.encode(member)
        except __HOLE__:
            return False
        return self.session.client.zscore(self.key, element) is not None
dataset/ETHPy150Open dahlia/sider/sider/sortedset.py/SortedSet.__contains__