Discord music bot

import discord
from discord.ext import commands
import os
import youtube_dl

client = commands.Bot(command_prefix="!")

## komendy ktore potrzebujemy
# play
# stop
# pause
# resume
# leave

# skip
# loop?
# add w wersji 3

@client.event
async def on_ready():
    print("Bot jest gotowy.")

@client.command()
async def play(ctx, url : str):
    song = os.path.isfile("song.mp3")
    try:
        if song:
            os.remove("song.mp3")
    except PermissionError:
        await ctx.send("Piosenka jeszcze leci! Użyj komendy stop.")
        return

    voiceChannel = discord.utils.get(ctx.guild.voice_channels, name="rozmówki")
    await voiceChannel.connect()
    voice = discord.utils.get(client.voice_clients, guild=ctx.guild)

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

    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        ydl.download([url])
    for file in os.listdir("./"):
        if file.endswith(".mp3"):
            os.rename(file, "song.mp3")
    voice.play(discord.FFmpegPCMAudio("song.mp3"))



client.run("your_token")