from pathlib import Path


def default_raw_csv_filename(job_id):
    """ Returns the filename for the raw CSV associated with job_id

    Parameters
    ----------
    job_id: str
        The job_id to generate the filename for

    Returns
    -------
    filename: pathlib.Path
        The filename associated with job_id which will be appended
        to some base path by the caller.
    """
    assert isinstance(job_id, str)

    return Path(f'original_{job_id}.csv')