how to modify the actual help command in discord.py code example

Example 1: how to change help command on discord python

client = commands.Bot(command_prefix = '~', help_command=None)

@client.command()
async def help(ctx):
    await context.send('`Whatever`')

Example 2: Discord.py - change the default help command

bot = commands.Bot(command_prefix='!', help_command=None)