. Why does it give me a "TypeError: 'NoneType' object" error? Code's in pyt-CodePudding

import os

from discord import FFmpegPCMAudio
from discord.ext.commands import Bot
from dotenv import load_dotenv

load_dotenv()
TOKEN = os.getenv('OTY2MDQ5MjA1ODg4MDk0MjY4.Yl8Fbw.k3ftJGOLznBIFmdnaFCNd73qaEk')
PREFIX = os.getenv('!')

client = Bot(command_prefix = list(PREFIX)) 


@client.event
async def on_ready():
    print('Nichijou Shuffle Bot Ready')


@client.command(aliases=['p', 'play'])
async def play(ctx, url: str = 'https://node-33.zeno.fm/tncreqmcwnhvv?zs=tdK49JAMSyu6lo3su_Wf-A&rj-tok=AAABgEq0dCAA2dBg3bs1EtEs7Q&rj-ttl'):
    channel = ctx.message.author.voice.channel
    global player
    try:
        player = await channel.connect()
    except:
        pass
    player.play(FFmpegPCMAudio('https://node-33.zeno.fm/tncreqmcwnhvv?zs=tdK49JAMSyu6lo3su_Wf-A&rj-tok=AAABgEq0dCAA2dBg3bs1EtEs7Q&rj-ttl'))


@client.command(aliases=['s', 'stop'])
async def stop(ctx):
    player.stop()


client.run(TOKEN)

I'm trying out this discord bot that plays music through a stream link. The error is happening in line 11. Credit to davestsomewhere for the code. I didn't modify the code at all but it keeps showing me the "TypeError: 'NoneType' object is not iterable" error. Don't know how to code but I think this is the only place where I can get an answer.

CodePudding user response：

It comes from the PREFIX that is equal to None. Thus the problem lies at the initialization of the PREFIX.

os.gentenv() returns the value of the environment variable key if it exists otherwise returns the default value. I don't know what you are trying to achieve with os.getenv('!'), but either the value associated with this key is None, either the key doesn't exist and the default value is in your case set to None.

CodePudding user response：

the issue can be replicated in this minimal example:

import os
PREFIX = os.getenv('!')
list(PREFIX)

The environment variable ! is not set, PREFIX then is None and making a list out of it is not possible. I'm not sure what should be in the environment variable and ! seems like a uncommon name to me.