#!/usr/bin/env python3
import csv
import argparse
import sys

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('-c', type=int, dest='columns', action="append")
    parser.add_argument('infile', nargs='+', type=argparse.FileType('rt'))
    args = parser.parse_args()
    if args.columns is None or len(args.columns) == 0:
        args.columns=[0]
    for file in args.infile:
        csv_infile=csv.reader(file)
        for row in csv_infile:
            try:
                outrow = [row[index] for index in args.columns]
                print('\t'.join(outrow))
            except IndexError:
                print("No such column.")
                print("Input has columns: {}".format(",".join([str(x) for x in range(len(row))])))
                print("You selected {}".format(args.columns))
                sys.exit(1)

if __name__ == '__main__':
    main()