Bot Discord Python Queue System - list

Question

hello guys
I have 1 problem that seems very usual, so i wanted to make queue system on my music bot discord using lists.
I see a similar question from stack overflow too Discord py - music bot queue command,in this site I copied the answers and change a little bit to my code.
But then i tried to play some music, it show error like this
IndexError : list assigment index out of range
What does my code look like:
queue = []
class Music(commands.Cog):
def __init__(self, bot):
self.bot = bot
self.queue = queue
#bot.command(name='join', help='Tells the bot to join the voice channel')
async def join(self, ctx):
if not ctx.message.author.voice:
await ctx.send("{} tidak terkonek ke voice channel".format(ctx.message.author.name))
return
else:
channel = ctx.message.author.voice.channel
self.queue = {}
await ctx.send(f'Connected to ``{channel}``')
await channel.connect()
#commands.Cog.listener()
async def on_ready(self):
print('Music cog successfully loaded.')
#bot.command(name='p', help='To play song')
async def play(self, ctx, *, url): #im not using try: and except: because its always skips the 'try': part
channel = ctx.message.author.voice.channel
voice_client = discord.utils.get(bot.voice_clients, guild=ctx.guild)
if voice_client is not None:
if not voice_client.is_connected():
voice_client = await channel.connect()
else:
await ctx.send(f"konekin ke {ctx.message.author.voice.channel} voice channel")
try:
voice_client = await channel.connect()
await ctx.send(f"sudah konek ke {ctx.message.author.voice.channel} voice channel")
except Exception as e:
await ctx.send(e)
async with ctx.typing():
filename = await YT_dlpSource.from_url(url)
if len(self.queue) == 0:
self.start_playing(ctx.voice_client, filename)
await ctx.send(f' **Searching for** ``' + url + '``\n **Now Playing:** ``{}'.format(filename.title) + "``")
else:
self.queue[len(self.queue)] = filename
await ctx.send(f' **Searching for** ``' + url + '``\n **Now Playing:** ``{}'.format(filename.title) + "``")
await ctx.send("Somenthing went wrong - please try again later!")
def start_playing(self, voice_client, filename):
self.queue[0] = filename
i = 0
while i < len(self.queue):
try:
voice_client.play(self.queue[i], after=lambda e: print('Player error: %s' % e) if e else None)
except:
pass
i += 1
And the error shows:
Ignoring exception in command p:
Traceback (most recent call last):
File "/home/User/.local/lib/python3.6/site-packages/discord/ext/commands/core.py", line 85, in wrapped
ret = await coro(*args, **kwargs)
File "/home/User/DISCOBOT/discord/cogs/music.py", line 104, in play
self.start_playing(ctx.voice_client, filename)
File "/home/User/DISCOBOT/discord/cogs/music.py", line 116, in start_playing
self.queue[0] = filename
IndexError: list assignment index out of range
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/User/.local/lib/python3.6/site-packages/discord/ext/commands/bot.py", line 939, in invoke
await ctx.command.invoke(ctx)
File "/home/Najwan/.local/lib/python3.6/site-packages/discord/ext/commands/core.py", line 863, in invoke
await injected(*ctx.args, **ctx.kwargs)
File "/home/User/.local/lib/python3.6/site-packages/discord/ext/commands/core.py", line 94, in wrapped
raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: IndexError: list assignment index out of range
Thanks for the help guys.

Answer 1

This is happening because the value of self.queue is empty, i.e., it has no index or items.
Instead of doing this: self.queue[0] = filename
Do this: self.queue.append(filename)