运行Discord机器人触发RuntimeError: no running event loop问题求助

在树莓派3上运行一款监控Fortnite版本及服务器状态的Discord机器人时，触发RuntimeError: no running event loop错误，尝试多个方案未解决，以下是问题详情及代码：

错误回溯 #

Traceback (most recent call last):
  File "/home/monksbot/testfordiscordbot.py", line 41, in <module>
    version_update_background_task.start()
  File "/home/monksbot/.local/lib/python3.9/site-packages/discord/ext/tasks/__init__.py", line 398, in start
    self._task = asyncio.create_task(self._loop(*args, **kwargs))
  File "/usr/lib/python3.9/asyncio/tasks.py", line 360, in create_task
    loop = events.get_running_loop()
RuntimeError: no running event loop

原代码 #

from discord.ext import tasks
import discord
import requests

client = discord.Client(intents=discord.Intents.all())
slash = SlashCommand(client, sync_commands=True)

guild_ids = [1018805336003584070]

@client.event
async def on_ready():
    activity = discord.Activity(type=discord.ActivityType.watching, name="Fortnite APIs")
await client.change_presence(status=discord.Status.online, activity=activity)

@tasks.loop(seconds=10)
async def version_update_background_task():
  aes = requests.get("https://fortnitecentral.gmatrixgames.ga/api/v1/aes")
  version = aes.json()["version"]
  mainaes = aes.json()["mainKey"]
  channel = client.get_channel(1018805336917950487)
  if version != "21.51":
    await channel.send(f"@here NEW VERSION DETECTED: Fortnite v{version} is now avaliable for download!\n\n> Main Key: {mainaes}")
    url = 'https://fortnite-api.com/images/map.png'
    req = requests.get(url)
    with open('images/Map.png', 'wb') as f:
        f.write(req.content)
        await channel.send("New Fortnite Map Detected!", file=discord.File('images/Map.png'))
        version_update_background_task.end()

@tasks.loop(seconds=10)
async def lightswitch_task():
  lightswitch = requests.get("https://fn-api.com/api/status")
  onoff = lightswitch.json()["data"]["status"]
  message = lightswitch.json()["data"]["message"]
  channel = client.get_channel(1018805336917950487)
  if onoff != "UP":
    await channel.send(f"@here {message}\n\n> Fortnite servers are now {onoff} for maintenance!", file=discord.File('images/BEGUN.png'))
    lightswitch_task.end()

@lightswitch_task.before_loop
async def lightswitch_task_before_loop():
    await client.wait_until_ready() 
@version_update_background_task.before_loop
async def version_update_background_task_before_loop():
    await client.wait_until_ready() 

version_update_background_task.start()
lightswitch_task.start()
client.run("no")

问题原因及解决方案 #

核心问题 #

你在全局作用域直接调用version_update_background_task.start()和lightswitch_task.start()，此时Discord客户端的事件循环还未启动（client.run()才会启动事件循环），而tasks.loop的start()方法需要依赖已运行的事件循环，因此触发错误。

修复步骤 #

1. 将任务启动逻辑移至on_ready事件中：当客户端成功连接Discord并准备就绪后，再启动后台任务，此时事件循环已正常运行。
2. 修正on_ready函数的缩进错误：原代码中await client.change_presence未缩进，属于语法错误，会导致函数逻辑异常。
3. 补充缺失的导入：原代码使用了SlashCommand但未导入，需添加from discord_slash import SlashCommand。
4. （可选但推荐）替换同步请求为异步请求：requests.get是同步阻塞调用，会卡住Discord机器人的事件循环，建议改用aiohttp实现异步HTTP请求，避免机器人响应延迟。

修改后的完整代码 #

from discord.ext import tasks
import discord
import requests
from discord_slash import SlashCommand  # 补充缺失的导入
import os

# 自动创建images目录，避免写入文件报错
os.makedirs('images', exist_ok=True)

client = discord.Client(intents=discord.Intents.all())
slash = SlashCommand(client, sync_commands=True)

guild_ids = [1018805336003584070]

@client.event
async def on_ready():
    activity = discord.Activity(type=discord.ActivityType.watching, name="Fortnite APIs")
    await client.change_presence(status=discord.Status.online, activity=activity)  # 修正缩进
    # 在客户端就绪后启动任务
    version_update_background_task.start()
    lightswitch_task.start()
    print("机器人已就绪，任务启动完成")

@tasks.loop(seconds=10)
async def version_update_background_task():
    aes = requests.get("https://fortnitecentral.gmatrixgames.ga/api/v1/aes")
    version = aes.json()["version"]
    mainaes = aes.json()["mainKey"]
    channel = client.get_channel(1018805336917950487)
    if version != "21.51":
        await channel.send(f"@here NEW VERSION DETECTED: Fortnite v{version} is now available for download!\n\n> Main Key: {mainaes}")
        url = 'https://fortnite-api.com/images/map.png'
        req = requests.get(url)
        with open('images/Map.png', 'wb') as f:
            f.write(req.content)
        await channel.send("New Fortnite Map Detected!", file=discord.File('images/Map.png'))
        version_update_background_task.end()

@tasks.loop(seconds=10)
async def lightswitch_task():
    lightswitch = requests.get("https://fn-api.com/api/status")
    onoff = lightswitch.json()["data"]["status"]
    message = lightswitch.json()["data"]["message"]
    channel = client.get_channel(1018805336917950487)
    if onoff != "UP":
        await channel.send(f"@here {message}\n\n> Fortnite servers are now {onoff} for maintenance!", file=discord.File('images/BEGUN.png'))
        lightswitch_task.end()

@lightswitch_task.before_loop
async def lightswitch_task_before_loop():
    await client.wait_until_ready() 

@version_update_background_task.before_loop
async def version_update_background_task_before_loop():
    await client.wait_until_ready() 

# 移除全局的任务启动调用，移至on_ready中
client.run("你的机器人Token")

额外提示 #

• 替换"你的机器人Token"为实际的Discord机器人令牌，不要泄露令牌。
• 确保树莓派上已安装所有依赖包：pip install discord.py discord-py-slash-command requests

内容的提问来源于stack exchange，提问作者Monks