#!/usr/bin/env python

# Inserts a new, empty spreadsheet column before the given index.

import csv

import sys

def main():

    try: _prog_name, col_num, name, fill_value = sys.argv

    except ValueError: raise SystemExit('Usage: '+sys.argv[0]

        +' <in col# col_name fill_value [| '+sys.argv[0]

        +' col_2# col_2_name col_2_value]... >out')

    col_num = int(col_num)

    # Transform input

    reader = csv.reader(sys.stdin)

    writer = csv.writer(sys.stdout)

    is_header = True

    value = name

    for row in reader:

        row.insert(col_num, value)

        if is_header:

            is_header = False

            value = fill_value

        writer.writerow(row)

main()