def download_files(playlist):
    open_text_file = open(playlist + '.txt', 'r')
    read_text_file = open_text_file.read().split('\n')
    for i in read_text_file:
        link = api_vk.audio.search(q=i)
        sleep(1)
        if len(i) == 0:
            print "File name is empty. Skipped."
            continue
        elif link[0] == 0:
            print i + " not found. Skipped."
            continue
        elif os.path.isfile(i + ".mp3"):
            print i + " is exists. Skipped."
            continue
        else:
            link = api_vk.audio.search(q=i, auto_complete=1, sort=2, count=1)[1]['url']
            downloaded_file = urllib.URLopener()
            downloaded_file.retrieve(link, i + '.mp3')
            sleep(3)
    print "\nAll files are downloaded.\nGood bye!"
    sys.exit()