convert youtube to mp3

youtube.py

from __future__ import unicode_literals
import youtube_dl   

ydl_opts = {
    'format': 'bestaudio/best',
    'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'mp3',
        'preferredquality': '192',
    }], 
} 

videos_list = [
]

videos_urls = ['https://www.youtube.com/watch?v={}'.format(v) for v in videos_list]

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    ydl.download(videos_urls)