[Python] Discord.py commands aren't responding

1. 
   I am trying to make a Discord bot using discord.py.
   
   
2. 
   I created two commands.
   
   
3. 
   When I sent ?hello bot didn't respond.
   

Here's the code:

import discord
import asyncio
import ast
from discord.ext import commands
intents = discord.Intents.default()
intents.members = True
intents.message_content = True
bot = commands.Bot(command_prefix='?', intents=intents)

@bot.event
async def on_ready():
print(f'logged in baby {bot.user}')

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

if 'nigg' in message.content or 'wigg' in message.content:
author = message.author
guild = message.guild
await author.add_roles(discord.utils.get(guild.roles, name='Racist'))
await message.delete()

@bot.command()
async def calculate(ctx, *, expression: str):
await ctx.send(f'{expression} = {eval(expression)}')

@bot.command()
async def hello(ctx):
print('hi')
await ctx.send('hello guys')

bot.run('token')


And yes – the bot was running while I typed that command.

I tried using @bot.command() and expected bot to respond but nothing happened.

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