Rename files in current directory to lowercase. Also works on windows.

lowercase.py

import os

""" 
Make every filename within the same directory lowercase, adding a temporary
character in the process to fool windows into believing that the filename has
really changed (windows treats filenames as case insensitive)

Usage: python lowercase.py
"""

c = "-"
path =  os.getcwd()
filenames = os.listdir(path)

for filename in filenames:
    os.rename(filename, filename+c)
    os.rename(filename+c, filename.lower())