尝试使用 Discord.py rewrite 向特定频道发送消息，但它不起作用

问题描述

我目前正在开发一个 discord 机器人，我正在尝试在用户升级后使用 Discord.py rewrite 向特定频道发送消息，但我收到此错误:

I'm currently working on a discord bot and I'm trying to send a message to a specific channel using Discord.py rewrite once the user levels up, and I'm getting this error:

   await channel.message.send(f"{message.author.mention} is now level {self.users[author_id]['level']}! congrats!")
AttributeError: 'NoneType' object has no attribute 'message'

所有代码如下:

import discord
from discord.ext import commands

import json
import asyncio

class Levels(commands.Cog):
    @commands.Cog.listener()
    async def on_message(self, message):
        if message.author == self.bot.user:
            return

        author_id = str(message.author.id)
        bot = commands.Bot(command_prefix='!')

        if author_id not in self.users:
            self.users[author_id] = {}
            self.users[author_id]['level'] = 1
            self.users[author_id]['exp'] = 0

        self.users[author_id]['exp'] += 1

        if author_id in self.users:
            if self.lvl_up(author_id):
                channel = bot.get_channel('636399538650742795')
                await channel.message.send(f"{message.author.mention} is now level {self.users[author_id]['level']}! congrats!")

    def __init__(self, bot):
        self.bot = bot

        with open(r"cogsuserdata.json", 'r') as f:
            self.users = json.load(f)

            self.bot.loop.create_task(self.save_users())

    async def save_users(self):
        await self.bot.wait_until_ready()
        while not self.bot.is_closed():
            with open(r"cogsuserdata.json", 'w') as f:
                json.dump(self.users, f, indent=4)

            await asyncio.sleep(5)


    def lvl_up(self, author_id):
        author_id = str(author_id)
        current_xp = self.users[author_id]['exp']
        current_lvl = self.users[author_id]['level']
        if current_xp >= ((3 * (current_lvl ** 2)) / .5):
            self.users[author_id]['level'] += 1
            return True
        else:
            return False

我真的不确定这里的问题是什么，但如果有人知道这个问题，如果你能告诉我如何解决这个问题，我将非常感激.

I'm really not sure what the issue is here but if anyone knows the problem I would be very appreciative if you could let me know how I can correct this.

感谢阅读我已经尝试了好几个小时.

Thanks for reading I've been trying to figure this out for hours.

仍然有问题.

推荐答案

你得到 AttributeError 因为 channel 是 None.

You get AttributeError because channel is None.

要修复它，您需要从频道 ID 中删除引号，如下所示:

To fix it you need to remove quotes from channel id like this:

channel = bot.get_channel(636399538650742795)

此处对此进行了描述:https://discordpy.readthedocs.io/en/latest/migrating.html#snowflakes-are-int

我还在下一行看到另一个错误.channel 也没有 message 属性.我认为您需要像这样修复它:

Also i see another error on the next line. The channel has no message attribute too. I think you need to fix it like this:

await channel.send(f"{message.author.mention} is now level {self.users[author_id]['level']}! congrats!")

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