remove one or more indices

def remove_index(self, index):
        'remove one or more indices'
        index_rm, single = convert_key_to_index(force_list(self.indices.keys()), index)
        if single:
            index_rm = [index_rm]

        index_new = [i for i in range(len(self.indices)) if i not in index_rm]

        if not index_new: # no index left
            self.clear(True)
            return

        names = mget_list(force_list(self.indices.keys()), index_new)
        items = [mget_list(i, index_new) for i in self.items()]
        self.clear(True)
        _MI_init(self, items, names)