我正在尝试编写一个discord机器人，它可以同时打印新消息并将用户输入从控制台发送到选定的通道。以下是我目前所做的工作：

import discord
from threading import Thread
from asyncio import run

intents = discord.Intents.all()
intents.members = True
client = discord.Client(intents=intents,chunk_guilds_at_startup=False)

main_channel = int(input('Enter channel ID you want to chat in: '))

channel = 613

@client.event
async def on_ready():
  global channel
  channel = await client.fetch_channel(main_channel)

async def send():
  while True:
    await channel.send(input('Send a message: '))
  
z = Thread(target=lambda:run(send()))
z.start()

try:
  client.run('##########################')
except discord.errors.HTTPException:
  from os import system
  system('kill 1')

我在第42行得到了TypeError: 'int' object has no attribute 'send'，为什么在on_ready（）中没有给全局变量赋值？