discord.py-rewrite -如何获得成员的加入排名？

import discord
from discord.ext import commands

intents = discord.Intents.default()
intents.members = True

bot = commands.Bot(command_prefix='!', intents=intents)

@bot.event
async def on_member_join(member):
    guild = member.guild
    join_position = sorted(guild.members, key=lambda m: m.joined_at).index(member) + 1
    await member.guild.text_channels[0].send(f'{member.name}是第{join_position}位加入的成员！')

bot.run('YOUR_BOT_TOKEN')