cog_template.py

#imports discord and the cog library
import discord
from discord.ext import commands

#this is the cog / extension
class Template:

    #needed to make the bot work
    def __init__(self, bot):
        self.bot = bot

    #this is how you register a command. 
    #hidden = True means that when you do [command bang]help it won't show
    @commands.command(hidden=True)
    #function of the command
    async def template_print(self):
        #the bot will say "sup" in the chat
        await self.bot.say("sup")

   #pass_context will pass on the message info of the person who called the command
    @commands.command(pass_context=True)
    #ctx is needed for the pass_context
    #num is a sub-command thing like !clearbot 29
    async def clearbot(self, ctx, num: int):
        """Deletes recent messages"""

        count = 0

        if num < 0:
            return

        while count <= num:
            del_flag = False
            async for msg in self.bot.logs_from(ctx.message.channel, limit=100):
                if count == num:
                    break
                elif msg.author.id == self.bot.user.id:
                    count += 1
                    del_flag = True
                    await self.bot.delete_message(msg)

            if not del_flag:
                break
                
                
#for the bot to add the cog. replace template with the classname
def setup(bot):
    bot.add_cog(Template(bot))