FLACファイルに同じフォルダのカバー画像を埋め込む

python

import os
import mutagen
from mutagen import File
from mutagen.flac import Picture, FLAC

def add_cover(filename, albumart):
    audio = File(filename)
    if len(audio.pictures) == 0:
        image = Picture()
        image.type = 3
        if os.path.splitext(albumart)[1] == '.jpg':
            mime = 'image/jpeg'
        elif os.path.splitext(albumart)[1] == '.png':
            mime = 'image/png'
        image.desc = 'front cover'
        with open(albumart, 'rb') as pic:
            image.data = pic.read()
            audio.add_picture(image)
            audio.save()

#フォルダ指定
parent = input(r'親フォルダのパスは？　　')
print(parent)
for (root, dirs, files) in os.walk(parent):
    if len(dirs) > 0:
        for dir_name in dirs:
            pass
    if len(files) > 0:
        for file_name in files:
            if file_name.endswith('.flac'):
                audio = root + '/' + file_name
                img = 'none'
                if os.path.exists(root + '/' + 'cover' + '.jpg'):
                    img = root + '/' + 'cover' + '.jpg'
                elif os.path.exists(root + '/' + 'cover' + '.png'):
                    img = root + '/' + 'cover' + '.png'
                if img != 'none':
                    print(audio)
                    add_cover(audio,img)
                else:
                    print(img + ':' + file_name)
input('enterを押すと終わる')                    
print('END')