Discord Bot读取.log文件含IMPORTANT:内容报错，求代码修正

我在Windows 10 + Python 3.10.11环境下，用@client.command装饰器开发Discord机器人，目标是让它从持续更新的.log文件中提取包含IMPORTANT:的内容并发送到Discord频道。但运行?run命令时触发错误，找不到直接读取.log文件输出到Discord的相关资料，刚接触Python，需要基础的语法和代码结构修正指导。

预期效果：机器人输出.log文件中含IMPORTANT:的行
实际情况：执行?run命令后仅返回错误

错误信息 #

Traceback (most recent call last):
  File "C:\Users\\AppData\Local\Programs\Python\Python310\lib\site-packages\discord\ext\commands\core.py", line 235, in wrapped
    ret = await coro(*args, **kwargs)
  File "C:\Users\*USER\OneDrive\Desktop\DiscordBot\main.py", line 18, in follow
    for line in loglines:
TypeError: 'coroutine' object is not iterable

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

Traceback (most recent call last):
  File "C:\Users\**USER\AppData\Local\Programs\Python\Python310\lib\site-packages\discord\ext\commands\bot.py", line 1366, in invoke
    await ctx.command.invoke(ctx)
  File "C:\Users|\*USER\AppData\Local\Programs\Python\Python310\lib\site-packages\discord\ext\commands\core.py", line 1029, in invoke
    await injected(*ctx.args, **ctx.kwargs)  # type: ignore
  File "C:\Users\*USER\AppData\Local\Programs\Python\Python310\lib\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: 'coroutine' object is not iterable
C:\Users\*USER\AppData\Local\Programs\Python\Python310\lib\asyncio\events.py:80: RuntimeWarning: coroutine 'Command.__call__' was never awaited
  self._context.run(self._callback, *self._args)
RuntimeWarning: Enable tracemalloc to get the object allocation traceback

原始代码 #

import discord
import time, os
from discord.ext import commands

@client.event
async def coroutine(ctx, *args): 
  print("Bot Is Ready")

@client.command()
async def run(thefile):
 if __name__ == "__main__":
    logfile = open(os.getenv("APPDATA")+"/.directory/logs/announcement.log", "r")
    loglines = follow(logfile)
    for line in loglines:
        if "IMPORTANT:" in line:
         await print (line)
        
client.run("token is here")

问题分析 #

1. 未初始化Bot实例：代码直接使用client但未创建commands.Bot对象，导致事件和命令无法绑定
2. 错误的事件函数：@client.event装饰的函数应为Discord预设事件（如on_ready），而非自定义的coroutine
3. 缺失follow函数实现：调用了follow(logfile)但未定义该函数，且即使有定义，异步处理逻辑也存在问题
4. await print错误：print是同步函数，不需要用await修饰，且Discord机器人需用ctx.send发送内容到频道
5. 无用参数与路径拼接问题：run命令定义的thefile参数未实际使用，且手动拼接路径易出现Windows系统分隔符兼容问题
6. 日志监听逻辑缺失：未实现持续读取日志新增内容的逻辑，无法跟踪实时更新的.log文件

修正后的代码 #

import discord
import os
import time
from discord.ext import commands

# 初始化Bot，设置命令前缀与必要权限
client = commands.Bot(command_prefix="?", intents=discord.Intents.default())

# 机器人就绪事件
@client.event
async def on_ready():
    print("Bot Is Ready")

# 实现持续读取日志新增内容的函数
def follow(logfile):
    logfile.seek(0, os.SEEK_END)  # 定位到文件末尾
    while True:
        line = logfile.readline()
        if not line:
            time.sleep(1)  # 无新内容时等待1秒
            continue
        yield line

@client.command()
async def run(ctx):
    # 用os.path.join拼接路径，适配Windows系统
    log_path = os.path.join(os.getenv("APPDATA"), ".directory", "logs", "announcement.log")
    try:
        with open(log_path, "r", encoding="utf-8") as logfile:
            # 先读取文件现有内容中的目标行
            for line in logfile:
                cleaned_line = line.strip()
                if "IMPORTANT:" in cleaned_line:
                    await ctx.send(cleaned_line)
            # 持续监听新增内容
            for line in follow(logfile):
                cleaned_line = line.strip()
                if "IMPORTANT:" in cleaned_line:
                    await ctx.send(cleaned_line)
    except FileNotFoundError:
        await ctx.send("日志文件不存在，请检查路径！")
    except Exception as e:
        await ctx.send(f"发生错误：{str(e)}")

# 运行机器人，替换为你的Token
client.run("你的机器人Token")

关键修正说明 #

• 新增commands.Bot实例初始化，指定命令前缀和默认权限（Intents）
• 替换错误事件函数为标准的on_ready，确保机器人就绪时触发提示
• 实现follow函数，通过定位文件末尾+循环读取，实现实时日志监听
• 用ctx.send替代await print，将内容发送到Discord频道
• 用os.path.join拼接路径，解决Windows系统路径分隔符问题
• 添加异常处理，避免文件不存在或其他错误导致机器人崩溃

内容的提问来源于stack exchange，提问作者Comet Caster