Checking basic functionality of discord bot

basic_bot.py

#/home/hi-man/anaconda3/bin/python

import os
import discord
from dotenv import load_dotenv

load_dotenv()
token = os.getenv('DISCORD_TOKEN')
guild = os.getenv('CONSTRUCT_CODES')
client = discord.Client()

class MyClient(discord.Client):
    async def on_ready():
        print(f'Logged in as : {client.user}')

    async def on_message(message):
        message.content = message.content.lower()
        if message.author == client.user:
            return

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

client.run(token)