discord.py |播放url中的音频

import discord
from discord.ext import commands
from discord.voice_client import VoiceClient
import youtube_dl

bot = commands.Bot(command_prefix='!')
client = discord.Client()

@bot.command()
async def play(ctx, url):
    voice_channel = ctx.message.author.voice.channel
    voice_client = await voice_channel.connect()

    ydl_opts = {'format': 'bestaudio'}
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        info = ydl.extract_info(url, download=False)
        url2 = info['formats'][0]['url']

    voice_client.play(discord.FFmpegPCMAudio(url2))

bot.run('YOUR_BOT_TOKEN')