#!/usr/bin/env python2.7

import sys
import csv

with open(sys.argv[1], 'rb') as src_file:
  # create csv reader
  src = csv.reader(src_file)

  with open(sys.argv[2], 'wb') as dst_file:
    # create csv writer
    dst = csv.writer(dst_file)

    # walk, mutate, and write rows
    for row in src:
      dst.writerow(row + (['foo'] * 2))