在discord.py中编辑角色图标会返回错误，知道为什么吗？

Question

@bot.command(name='role')
async def role(ctx, role_id, new_icon_url):

    new_icon_url = str(new_icon_url)
    if new_icon_url.count('<:') != 0:
        new_icon_url = new_icon_url.split(':')
        new_icon_url = new_icon_url[2]
        new_icon_url = new_icon_url.replace('>', '')
        new_icon_url = 'https://cdn.discordapp.com/emojis/%{placeholder}%.png'.replace('%{placeholder}%', new_icon_url)

    role = discord.utils.get(ctx.guild.roles, id=int(role_id))

    if role is not None:
        try:
            await role.edit(display_icon=new_icon_url)
            await ctx.send(f"Role icon for {role.name} has been updated.")
        except discord.errors.Forbidden:
            await ctx.send("I don't have the required permissions to edit role icons.")
    else:
        await ctx.send(f"Role with ID {role_id} not found.")

错误信息：

Traceback (most recent call last):
  File "C:\Users\VosQu\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\discord\ext\commands\core.py", line 235, in wrapped
    ret = await coro(*args, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\VosQu\OneDrive\Desktop\Brewy Poo\brew.py", line 271, in role
    new_icon_url = bytes(new_icon_url)
                   ^^^^^^^^^^^^^^^^^^^
TypeError: string argument without an encoding

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

Traceback (most recent call last):
  File "C:\Users\VosQu\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\discord\ext\commands\bot.py", line 1350, in invoke
    await ctx.command.invoke(ctx)
  File "C:\Users\VosQu\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\discord\ext\commands\core.py", line 1029, in invoke
    await injected(*ctx.args, **ctx.kwargs)  # type: ignore
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\VosQu\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\discord\ext\commands\core.py", line 244, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: TypeError: string argument without an encoding

我本以为它会更改角色图标，但它只是返回了一个错误。

Answer 1

正如错误所示，您需要随字符串一起传递编码系统。例如，使用

utf-8

作为我们的编码系统，它看起来像

bytes(url, "utf-8")

Answer 2

发生此错误是因为

discord.py

模块希望您将

bytes

对象传递给

display_icon

参数，而不是包含图像 url 的字符串。

开发命令的更合适方法是接收图像文件（附加到命令消息中）：

import discord
from discord.ext import commands


@bot.command(name='roleicon')
async def role(ctx: commands.Context, role: discord.Role, new_icon: discord.Attachment):
    try:
        await role.edit(display_icon=await new_icon.read())
    except discord.errors.Forbidden:
        await ctx.send("I don't have the required permissions to edit role icons.")
    else:
        await ctx.send(f"Role icon for {role.name} has been updated.")

备注：

• 不要接收角色 ID，而是使用

  role: discord.Role

  ，库将进行自动转换。此参数表示法还允许用户输入角色的名称或提及；
• 输入变量是良好的编程习惯。这将使您的 IDE 能够检查您的代码并指出可能的错误。