hello写了一段代码

import discord
import os

async def on_ready():
  await client.change_presence(game=discord.Game(name=" dm for support  ;)"))

client.run("<TOKEN>") 
TOKEN = os.environ['TOKEN']

但总是带着错误回来

Traceback (most recent call last):
  File "main.py", line 10, in <module>
    client.run("<TOKEN>") 
NameError: name 'client' is not defined