Rename same filenames from entire directory

rename_dup.py

import os
import filecmp

dirnow = os.getcwd()
print("Now in: {} \n".format(dirnow))

names_seen = list()

def renamestuff(path):
	n = 1
	for root, dirs, files in os.walk(path):
		for name in files:

			filePath = os.path.join(os.path.abspath(root), name)

			if n == 20:
				n = 1

			if name.lower() in names_seen:
				newname = name.replace('.', ' ({}).'.format(n))
				os.rename(filePath, os.path.join(os.path.abspath(root), newname))
				n += 1

				# names_seen.append(newname)

			else:
				names_seen.append(name)
				n = 1

			print(name)
	return

renamestuff(os.path.join(dirnow, 'dir'))
print('\n', names_seen)