def sort_filenames(filenames):
    """
    sort a list of files by filename only, ignoring the directory names
    """
    basenames = [os.path.basename(x) for x in filenames]
    indexes = [i[0] for i in sorted(enumerate(basenames), key=lambda x:x[1])]
    return [filenames[x] for x in indexes]
sort a list of files by filename only, ignoring the directory names