【问题标题】：TypeError: Inheritance a class from URL is forbiddenTypeError：禁止从 URL 继承类
【发布时间】：2018-10-14 08:46:00
【问题描述】：

我在尝试运行我为 Discord 制作的机器人时遇到了这个错误。这发生在下载一些模块后。有没有办法解决这个问题？

Traceback (most recent call last):
  File "C:\Users\Jeriel\Desktop\JerryBot\run.py", line 1, in <module>
    import discord
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\discord\__
init__.py", line 20, in <module>
    from .client import Client, AppInfo
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\discord\cl
ient.py", line 30, in <module>
    from .guild import Guild
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\discord\gu
ild.py", line 39, in <module>
    from .channel import *
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\discord\ch
annel.py", line 31, in <module>
    from .webhook import Webhook
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\discord\we
bhook.py", line 27, in <module>
    import aiohttp
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\aiohttp\__
init__.py", line 6, in <module>
    from .client import *  # noqa
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\aiohttp\cl
ient.py", line 15, in <module>
    from . import connector as connector_mod
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\aiohttp\co
nnector.py", line 17, in <module>
    from .client_proto import ResponseHandler
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\aiohttp\cl
ient_proto.py", line 6, in <module>
    from .http import HttpResponseParser, StreamWriter
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\aiohttp\ht
tp.py", line 8, in <module>
    from .http_parser import (HttpParser, HttpRequestParser, HttpResponseParser,

  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\aiohttp\ht
tp_parser.py", line 15, in <module>
    from .http_writer import HttpVersion, HttpVersion10
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\aiohttp\ht
tp_writer.py", line 304, in <module>
    class URL(yarl.URL):
  File "C:\Users\Jeriel\AppData\Roaming\Python\Python36\site-packages\yarl\__ini
t__.py", line 230, in __init_subclass__
    "is forbidden".format(cls))
TypeError: Inheritance a class <class 'aiohttp.http_writer.URL'> from URL is for
bidden

【问题讨论】：

看起来您可能正在运行旧版本的 aiohttp。尝试运行pip install --upgrade aiohttp

标签： python python-3.x discord.py discord.py-rewrite

【解决方案1】：

Discord.py rewrite 分支最近在 requirements.txt 和 aiohttp 支持方面存在一些问题。需要手动安装低版本的 yarl 来支持 discord.py 所需的 aiohttp 库。

您需要运行以下命令：

pip install "yarl<1.2"

更新

新版本的 discord.py rewrite 修复了这个问题，您不再需要按照上述解决方案进行操作。正确的做法是从 GitHub 重新下载 discord.py rewrite 并升级包。

【讨论】：

【解决方案2】：

我遇到了同样的问题，但为了设置 self-bot，只需将其粘贴到 requirments.txt 中：

yarl<1.2

【讨论】：

【解决方案3】：

此答案适用于 aiohttp。如果有人使用 aiohttp 2.2.5 解决了这个问题，可以使用 yarl 的 0.13.0 版本来解决。举个例子：

pip install yarl==0.13.0

【讨论】：