Script to convert CamelCase filenames to snake_case

rename.py

import os
import re

files = [f for f in os.listdir('.') if os.path.isfile(f)]

def convert(name):
    s = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s).lower()

for file in files:
	print(convert(file))
	if file != 'rename.py':
		os.rename(file, convert(file))