#!/usr/bin/python

import os, sys

import glob

nargs = len(sys.argv)

if not 3 <= nargs <= 5:
    print "usage: %s search_text replace_text [infile [outfile]]" % \
        os.path.basename(sys.argv[0])
else:
    stext = sys.argv[1]
    rtext = sys.argv[2]
    input = sys.stdin
    output = sys.stdout
    files = glob.glob('./employee/*/*py')
    for file in files:

      if nargs > 3:
          input = open(file)
      if nargs > 4:
          output = open(file + '_copy', 'w')
      for s in input.xreadlines(  ):
          output.write(s.replace(stext, rtext))
      output.close(  )
      input.close(  )