recursively change names to all lowercase and replace spaces with _

change_name.py

import glob
from pathlib import Path

file_list = glob.glob('**/*', recursive=True)
file_list.sort(key=len, reverse=True)

def rename(file):
    _name = file.name.replace(' ', '_').lower()
    _name = file.parent / Path(_name)
    file.rename(_name)

for file in file_list:
    if file == __file__:
        continue
    _file = Path(file)
    rename(_file)