[Python] discord.ext.commands.errors.CommandNotFound: Command "coucou" is not found

I'm trying to create a bot Discord with Python. I created a class MyBot like this:

import discord
from discord.ext import commands

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

class MyBot(commands.Bot):
def __init__(self):
super().__init__(command_prefix="!", intents=intents, description="My Bot !!")

async def on_ready(self):
print("My Bot is Online !")

async def coucou(ctx):
await ctx.send("You say coucou, i say coucou !")


And in my main.py I have:

import discord
import os
from discord.ext import commands
from Classbot.class_bot import MyBot as MB

from dotenv import load_dotenv
load_dotenv(dotenv_path="config")

bot = MB()
bot.coucou()
bot.run(os.getenv("mytoken"))


The bot is online and I have the message "My Bot is Online !" but in Discord when I try: !coucou, I get this error:

discord.ext.commands.errors.CommandNotFound: Command "coucou" is not found


I don't succeed in calling the method coucou. It works if I don't create a class and put all the code in the same main.py page but I want to use a class.

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