756 Bytes
import argparse
from os.path import isfile

if __name__ == "__main__":

    parser = argparse.ArgumentParser(
        description="Convert old files with wrong id to new one. Masseffect.")

    parser.add_argument("file", type=str, help="feature, x2x, or list file")
    parser.add_argument("--outfile", type=str, default="out.txt", help="output file")

    args = parser.parse_args()
    assert isfile(args.file), "The given file does not exist."

    with open(args.file, "r") as f, open(args.outfile, "w") as of:
        for line in f:
            splited = line.replace("\n", "").split(" ")
            metas = splited[0].split(",")
            splited[0] = ",".join(metas)
            of.write(" ".join(splited) + "\n")