def x_offset_gff(GFFParseobj, x_offset):
    """Takes in a gff object (a gff file parsed as a pandas dataframe),
    and an x_offset value and shifts the start, stop, center, lmost, and rmost.

    Returns a GFFParse object with the shifted values in GFFParse.features.
    """
    for columnname in ['start', 'stop', 'center', 'lmost', 'rmost']:
        GFFParseobj.features[columnname] = GFFParseobj.features[columnname
            ] + x_offset
    return GFFParseobj
