我怎样才能让我的不和谐机器人发送mp3文件？(discord.py)

pip install discord.py

import discord

client = discord.Client()

@client.event
async def on_ready():
    print(f'We have logged in as {client.user}')

@client.event
async def on_message(message):
    if message.author == client.user:
        return

    if message.content.startswith('!send_mp3'):
        # 检查是否附带了mp3文件
        if len(message.attachments) > 0 and message.attachments[0].filename.endswith('.mp3'):
            # 获取第一个附件
            attachment = message.attachments[0]
            
            # 将附件保存到本地
            await attachment.save(attachment.filename)
            
            # 发送附件
            await message.channel.send(file=discord.File(attachment.filename))
        else:
            await message.channel.send('请附带一个mp3文件')

# 替换为你的机器人令牌
client.run('your_bot_token')