@classmethod
    def _filename_year(cls, filename):
        return filename[0:4]
Change the subject of a MUC room.
dataset/ETHPy150Open openelections/openelections-core/openelex/base/datasource.py/BaseDatasource._filename_year--crossover with--dataset/ETHPy150Open ralphm/wokkel/wokkel/muc.py/MUCClientProtocol.subject