Discord.py开发反应响应机器人时wait_for缺失event参数报错如何解决？

你遇到的报错本质是类和实例对象用法混淆：

• discord.ext.commands.Bot是类模板，wait_for、get_channel都属于实例方法，只能通过你已经初始化的Bot实例（也就是你代码里的client对象）调用，不能直接用Bot类本身调用
• 直接用类调用实例方法时，Python会把你传入的第一个参数识别为要求的self占位符，所以你传的"reaction_add"被当成了self参数，系统自然提示你缺少必填的event参数

1. 修改报错行的调用对象：将confirmation = await Bot.wait_for("reaction_add", check=check)改为confirmation = await client.wait_for("reaction_add", check=check)
2. 同步修改下一行的get_channel调用：将channel = Bot.get_channel(704609444092182632)改为channel = client.get_channel(704609444092182632)

import discord
from discord.utils import get
from discord.ext import commands
from discord.ext.commands import Bot

client = commands.Bot(command_prefix = "!") 
# 此处替换为你自己的机器人TOKEN
TOKEN = "xxx"

@client.event
async def on_ready():
    print('We have logged in as {0.user}'.format(client))

@client.command(pass_context = "true")
async def ping(ctx):
    def check(reaction, user):
       return user == ctx.author and str(reaction.emoji) in ["✅"] and reaction.message == message
    message = await ctx.send("Test emoji")
    await message.add_reaction("✅")
    confirmation = await client.wait_for("reaction_add", check=check) 
    channel = client.get_channel(704609444092182632)

    if confirmation:
        await channel.send("yay")

client.run(TOKEN)

内容的提问来源于stack exchange，提问作者LLiver