[!answered!] There's an error with my code while I was coding discord bot, can anyone help?

Question

import discord
import os
import discord

client = discord.Client()

@client.event

async def on_ready():
print('We have logged in as {0.user}'.format(client))

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

if message.content.startswith('hello'):
await message.channel.send('Hello!')

#server list

@bot.command(help = "Shows the Guild the bot is in")
async def serverlist(ctx):
if ctx.author.id == ownerID:
msg = "\n".join(f"{x}" for x in bot.guilds)
embed = Embed(
title = "",
description = "",
color = col
)
embed.add_field(name = "All Bots Guilds", value = f"```\n{msg}\n```")
await ctx.send(embed = embed)

client.run(os.getenv('TOKEN'))

It says
NameError: Name 'bot' is not defined

Answer 1

bot = commands.Bot(
command_prefix="!", # Change to desired prefix
case_insensitive=True # Commands aren't case-sensitive
)

Answer 2

For the location where it is
It's at line 24 @bot.command(help = "shows the guild the bot is in")