在 discord.py wait_for 上带有 check() 的 TypeError答案

【问题标题】：TypeError with check() on discord.py wait_for在 discord.py wait_for 上带有 check() 的 TypeError
【发布时间】：2021-02-06 19:33:55
【问题描述】：

我有一个机器人，它将打开一个使用 wait_for(reaction_add) 功能的关闭民意调查。问题是，当我检查作者是否做出反应时，我得到了一个 TypeError。这是命令：

@bot.command()
async def closepoll(ctx):
    if not ctx.author.guild_permissions.mute_members:
        await ctx.send("You cannot use this")
    else:
        await ctx.send("React to the poll I must close")
        def check(m):
            return m.author == ctx.author
        try:
            reaction, user = await bot.wait_for('reaction_add', timeout=120.0, check=check)
        except asyncio.TimeoutError:
            await ctx.send('Did not receive any reaction')
        else:
            message = reaction.message
            if message.content.startswith("Poll:") and str(user) == str(ctx.author):
                await message.edit(content="This poll is now closed.")
            else:
                await ctx.send("That is not a poll")

但我得到了错误：

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/discord/ext/commands/core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "hypixel.py", line 138, in closepoll
    except asyncio.TimeoutError:
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/asyncio/tasks.py", line 483, in wait_for
    return fut.result()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/discord/client.py", line 339, in dispatch
    result = condition(*args)
TypeError: check() takes 1 positional argument but 2 were given

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/discord/ext/commands/bot.py", line 903, in invoke
    await ctx.command.invoke(ctx)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/discord/ext/commands/core.py", line 855, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/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: TypeError: check() takes 1 positional argument but 2 were given

【问题讨论】：

标签： python asynchronous discord discord.py python-asyncio

【解决方案1】：

check 应采用的参数数量取决于您等待的事件。 reaction_add 事件有两个参数，但你的函数只有一个。

尝试用两个参数定义一个检查函数。比如the documentation给出的例子：

def check(reaction, user):
    return user == message.author and str(reaction.emoji) == '?'

【讨论】：

是的，谢谢，我不应该使用def check(m)，而是应该使用def check(reaction, user)