我的意图是在机器人加入时立即为欢迎消息设置一个通道，并能够使用指定的命令进行更改。这是我的代码：
import discord
from discord.ext import commands
import json
def get_welcomechannel(client, message,):
with open('welcomechannel.json', 'r') as f:
welcomechannel = json.load(f)
return welcomechannel[str(message.guild.id)]
@client.event
async def on_guild_join(guild):
general = find(lambda x: x.name == 'general', guild.text_channels)
if general and general.permissions_for(guild.me).send_messages:
await general.send(f'Hello {guild.name}! My name is {client.user.name} and my prefix is ``?``! run ``?help`` to begin using me!')
with open('prefixes.json', 'r') as f:
prefixes = json.load(f)
prefixes[str(guild.id)] = "?"
with open ('prefixes.json', 'w') as f:
json.dump(prefixes, f, indent=4)
with open('welcomechannel.json', 'r') as f:
welcomechannel = json.load(f)
welcomechannel[str(guild.id)] = "general"
with open ('prefixes.json', 'w') as f:
json.dump(prefixes, f, indent=4)
@client.event
async def on_guild_remove(guild):
with open('prefixes.json', 'r') as f:
prefixes = json.load(f)
prefixes.pop(str(guild.id))
with open ('prefixes.json', 'w') as f:
json.dump(prefixes, f, indent=4)
with open('welcomechannel.json', 'r') as f:
welcomechannel = json.load(f)
welcomechannel.pop(str(guild.id))
with open ('welcomechannel.json', 'w') as f:
json.dump(welcomechannel, f, indent=4)
print(f"{guild.name} kicked me!")
#rest of code here...
@client.command(name="changewelcomechannel")
async def changewelcomechannel(ctx, welcomechannel):
with open('welcomechannel.json', 'r') as f:
welcomechannel = json.load(f)
welcomechannel[str(ctx.guild.id)] = welcomechannel
with open ('welcomechannel.json', 'w') as f:
json.dump(welcomechannel, f, indent=4)
await ctx.send(f"Welcome channel is now **{welcomechannel}**!"
但我得到了这个错误：
Ignoring exception in command changewelcomechannel:
2021-11-24T09:38:41.247854+00:00 app[worker.1]: Traceback (most recent call last):
2021-11-24T09:38:41.247927+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/discord/ext/commands/core.py", line 85, in wrapped
2021-11-24T09:38:41.247928+00:00 app[worker.1]: ret = await coro(*args, **kwargs)
2021-11-24T09:38:41.247943+00:00 app[worker.1]: File "/app/bot.py", line 352, in changewelcomechannel
2021-11-24T09:38:41.247943+00:00 app[worker.1]: json.dump(welcomechannel, f, indent=4)
2021-11-24T09:38:41.247957+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/json/__init__.py", line 179, in dump
2021-11-24T09:38:41.247958+00:00 app[worker.1]: for chunk in iterable:
2021-11-24T09:38:41.247976+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/json/encoder.py", line 431, in _iterencode
2021-11-24T09:38:41.247976+00:00 app[worker.1]: yield from _iterencode_dict(o, _current_indent_level)
2021-11-24T09:38:41.248004+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/json/encoder.py", line 405, in _iterencode_dict
2021-11-24T09:38:41.248005+00:00 app[worker.1]: yield from chunks
2021-11-24T09:38:41.248018+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/json/encoder.py", line 340, in _iterencode_dict
2021-11-24T09:38:41.248019+00:00 app[worker.1]: raise ValueError("Circular reference detected")
2021-11-24T09:38:41.248041+00:00 app[worker.1]: ValueError: Circular reference detected
我在本地没有完整的错误代码，所以我必须复制并粘贴我能找到的heroku错误代码。
我在另一个命令中使用了相同的结构，效果很好。我对在python中使用json模块没有太多经验，所以如果有人能帮忙，那就太棒了。非常感谢
编辑：我终于意识到我做错了什么，我应该在中使用另一个变量
welcomechannel[str(ctx.guild.id)] = welcomechannel# this is supposed to be the new variable#
错误是提到了一个循环引用，这是您试图引用其内部对象的地方。当你写时，你会这样做
welcomechannel[str(ctx.guild.id)] = welcomechannel
正如您所看到的，您正在将对象welcomechannel的属性指定给它自己。
也许你想尝试重命名函数参数welcomechannel，因为它目前不明确，即在函数开始后几行，您用json对象覆盖它。您也可以在此处重命名变量：
welcomechannel = json.load(f)