Python3 file and folder/directory sanitizer/format/renamer

fformat.py

import os, re, unicodedata

def clean(input_str):
    # remove accents, only_ascii
    nfkd_form = unicodedata.normalize('NFKD', input_str)
    only_ascii = nfkd_form.encode('ASCII', 'ignore')
    name = str(only_ascii, 'utf-8')
    # replace non alphanumeric caracters by underscore
    name = re.sub('[^0-9a-zA-Z]+', '_', name)
    return name

def clean_file(name, path):
    s = os.path.splitext(name)
    filename, extension = s[0], s[1]
    clean_file = clean(filename)
    base = os.path.dirname(path)
    new_file = os.path.join(base, clean_file+extension)
    os.rename(path, new_file)

def clean_folder(name, path):
    clean_folder = clean(name)
    base = os.path.dirname(path)
    new_folder = os.path.join(base, clean_folder)
    os.rename(path, new_folder)
    return new_folder

def process_folder(path):
    for f_name in os.listdir(path):
        if not f_name.startswith("."):
            f_path = os.path.join(path, f_name)
            if os.path.isfile(f_path):
                clean_file(f_name, f_path)
            if os.path.isdir(f_path):
                n = clean_folder(f_name, f_path)
                process_folder(n)

process_folder(os.getcwd())