read_and_write.py

from argparse import ArgumentParser

parser = ArgumentParser()
parser.add_argument("input_file", type=str)
parser.add_argument("output_file", type=str)

args = parser.parse_args()

import icartt

ict = icartt.Dataset(args.input_file)
ict.splitChar = ", "

with open(args.output_file, "w") as f:
    ict.write(f)