Batch renaming files under this script's folder

rename.py

# -*- coding: utf-8 -*-
# This script renames all files under this script's folder
# Ruofei Du
# 12/13/2017
import glob, os

prefix = 'bing_'
dir_path = os.path.dirname(os.path.realpath(__file__))
sub_dir_list = glob.glob(dir_path + '*')
for dir_item in sub_dir_list:
    files = glob.glob(dir_item + '/*.*')
    i = 0
    for f in files:
        p = f.rfind('.')
        extension = f[p+1:]
        if extension == 'cmd' or extension == 'py' or p < 0:
            continue
        os.rename(f, os.path.join(prefix + str(i) + '.' + extension))
        i += 1