Minimal Python3 code example (for Discord.py BOT library) for playing an audio file in a voice channel

audioTest.py

#
# Minimal code for an audio file player BOT in a voice channel
#   
# Entirely based on the example from Rapptz (that was NOT working for me)
# https://github.com/Rapptz/discord.py/blob/master/examples/basic_voice.py
#
# Nov 15 2022

import asyncio
import discord
from discord.ext import commands

from config_private import *        # Import private credentials (prefs.py)


ffmpeg_options = {              # type > ffmpeg --help, to list options
    'options': '-vn',           # disable video
}


class AudioTest(commands.Cog):
    def __init__(self, bot):
        self.bot = bot

    @commands.command()
    async def testme(self, ctx):
        """USAGE  !testme (joins the voice chan specified by CHANNEL, and plays a file)"""

        # This is the filename to play
        filename = './a.mp3'        # it works with *.wav files too

        channel = await self.bot.fetch_channel(CHANNEL)

        vc = await channel.connect()
        await ctx.send(f'Connected!')

        vc.play(discord.FFmpegPCMAudio(filename))
        vc.source = discord.PCMVolumeTransformer(vc.source)
        vc.source.volume = 0.5


        while vc.is_playing():
            await ctx.send(f'Still playing...')
            await asyncio.sleep(0.5)

        await vc.disconnect(force=True) 
        await ctx.send(f'Disconnected!')




intents = discord.Intents.default()
intents.message_content = True

bot = commands.Bot(
    command_prefix=commands.when_mentioned_or("!"),
    description='Minimal audio-file player bot example',
    intents=intents,
)


@bot.event
async def on_ready():
    print(f'Logged in as {bot.user} (ID: {bot.user.id})')
    print('------')


async def main():
    async with bot:
        await bot.add_cog(AudioTest(bot))
        await bot.start(TOKEN)


asyncio.run(main())