如何修复discord.py中ctx缺失的MissingRequiredArgument报错且保留类与self

报错信息 #

Traceback (most recent call last):
File "C:\Users\sasha\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\bot.py", line 939, in invoke
await ctx.command.invoke(ctx)
File "C:\Users\sasha\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\core.py", line 855, in invoke
await self.prepare(ctx)
File "C:\Users\sasha\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\core.py", line 789, in prepare
await self._parse_arguments(ctx)
File "C:\Users\sasha\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\core.py", line 697, in _parse_arguments
transformed = await self.transform(ctx, param)
File "C:\Users\sasha\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\core.py", line 542, in transform
raise MissingRequiredArgument(param)
discord.ext.commands.errors.MissingRequiredArgument: ctx is a required argument that is missing.

问题原因 #

• 你在__init__方法里用inspect手动遍历添加类内命令的逻辑错误，会把类方法的self参数识别为命令需要用户传入的参数，打乱了框架自动传入ctx的逻辑，最终导致框架判定ctx参数缺失
• 你使用了已经废弃的pass_context=True参数，discord.py v1.5之后ctx会默认自动注入，不需要手动开启该参数
• 代码存在拼写错误：reg方法内调用的self.embed()不存在，你定义的对应方法名为embed_channel

修复代码（保留原有类结构和self参数） #

#!/usr/bin/python3
from discord.ext import commands
import discord

TOKEN = "你的机器人令牌" # 自行补充实际令牌值

class StarBot(commands.Bot):
    def __init__(self, command_prefix, **options):
        super().__init__(command_prefix, **options)

    async def setup_hook(self):
        # 官方推荐的类内命令注册方式，替换原来的inspect遍历逻辑
        self.add_command(self.reg)

    async def on_ready(self):
        print('Logged on as {0}!'.format(self.user))

    # 删除废弃的pass_context参数
    @commands.command(name='reg', help='Для регистрации')
    async def reg(self, ctx):
        if ' '.join(str(ctx.channel).split(' ')[:2]) == 'Direct Message':
            # 修正方法名拼写错误
            await self.embed_channel(ctx.channel, "Начало регистрации")

    async def embed_channel(self, channel, title, string='', color=0xff9900):
        embed = discord.Embed(color=color, title=title, description=string)
        msg = await channel.send(embed=embed)
        return msg

intents = discord.Intents.all()
bot = StarBot(command_prefix='/', intents=intents)
bot.run(TOKEN)

内容的提问来源于stack exchange，提问作者Phoenix