We have a code:
    names = os.listdir(src)
    if ignore is not None:
        ignored_names = ignore(src, names)
    else:
        ignored_names = set()

    os.makedirs(dst)
        
    errors = []

But if I had created this folder. I have exception.

Maybe add "if"?

    if os.path.isdir(dst) is False:
        os.makedirs(dst)
        pass