def __init__(self, output_info=None):
        """
        Arguments:
          output_info: a StreamInfo object to which to write an internal
            ballot file.

        """
        if output_info is None:
            output_info = utils.PathInfo(os.devnull)
        # We check the argument here to fail fast and help the user locate
        # the source of the issue more quickly.
        assert isinstance(output_info, utils.StreamInfo)
        self.output_info = output_info
dataset/ETHPy150Open cjerdonek/open-rcv/openrcv/parsing.py/BLTParser.__init__/original