@manipulative
    def __setitem__(self, member, score):
        if not isinstance(score, numbers.Real):
            raise TypeError('score must be a float, not ' + repr(score))
        element = self.value_type.encode(member)
        self.session.client.zadd(self.key, score, element)
Sets the ``score`` of the ``member``.  Adds the ``member``
dataset/ETHPy150Open dahlia/sider/sider/sortedset.py/SortedSet.__setitem__