I had to rename the folders in a sub-directory on my Mac OS to lower case and this was the only code I could get to work. It appears you need to remove the directory and create a new one with the right case, you cannot simply use `os.rename`

rename_folder_mac_os_using_python

import glob
import pathlib
import shutil
import os


src = '/Users/rds/Local Sites/biblejot/app/public_static/kjv/**/index.html'
temp = '/Users/rds/Local Sites/biblejot/app/public_static/kjv/temp/'
path = pathlib.Path(temp)
path.mkdir(parents=True, exist_ok=True)
files = glob.glob(src, recursive=True)
for f in files:
    folders = f.split("/")
    old_dir = "/".join(folders[:-1])
    new_dir = folders[:-2] + [folders[-2].lower()]    
    temp_file = os.path.join(temp, folders[-1])
    print(f"{f} >> {temp_file}")
    shutil.move(f, temp_file)
    # delete folder
    shutil.rmtree(old_dir, True)
    # create new folder
    new_path = "/".join(new_dir)
    path = pathlib.Path(new_path)
    path.mkdir(parents=True, exist_ok=True)
    # append file
    new_path = os.path.join(new_path, folders[-1])
    print(f"{temp_file} >> {new_path}")
    shutil.move(temp_file, new_path)