import asyncio

from discord.ext import commands
from discord import app_commands

# define Bot with **needed** parameters
bot = commands.Bot(command_prefix="some_prefix", intents=some_intents_definition)

# You can now use `@bot.tree.command()` as a decorator:
@bot.tree.command()
async def my_command(interaction: discord.Interaction) -> None:
  await interaction.response.send_message("Hello from my command!")
### NOTE: the above is a global command, see the `main()` func below:

# we can even use Groups
group = app_commands.Group(name="some-parent", description="description")

@group.command()
async def my_subcommand(interaction: discord.Interaction) -> None:
  await interaction.response.send_message("hello from the subcommand!")
  
bot.tree.add_command(group, guild=discord.Object(id=...))

async def main():
  async with bot:
    # do you setup stuff if you need it here, then:
    bot.tree.copy_global_to(guild=discord.Object(id=...))  # we copy the global commands we have to a guild, this is optional
    await bot.start(MY_TOKEN)

# We still need to sync this tree somehow, but you can make a command as discussed already.