#!/usr/bin/env python
#Created by LinuxDynasty
import os, re, sys

os.chdir(sys.argv[1])
ls = os.listdir('./')
for file_o in ls:
  file_n = re.sub("\w\.", ".", file_o)
  os.rename(file_o, file_n)

print os.listdir("./")

To run this script you will do this.

python <script> <"directory">

python rename1.py "/home/dynasty/test"