Basic Bot Setup With Cogs & Custom Prefix

bot.py

"""The Creator of this code is AnshAg2007"""
"""This is a very basic setup of a discord.py bot with cogs and custom prefix
But to use it,you must know the basic cog structures too."""
import discord
import json
import os
from discord.ext import commands
"""At Above we have imported discord.py,os and json database,
we also imported commands from discord extension."""

"""Here Comes Our Custom Prefix Part,
You will need a prefixes.json file to store the prefixes for every server"""
def get_prefix(bot,message):
    with open('prefixes.json', 'r') as f:
        prefixes = json.load(f)
    return prefixes[str(message.guild.id)]

bot = commands.Bot(command_prefix=get_prefix)
"""Here we will make a cogs loader/unloader command,
And will do a basic eval command import called Jishaku/Jsk"""

bot.load_extension('jishaku')
@bot.command(hidden=True)
@commands.is_owner()
async def load(ctx,extension,hidden=True):
    bot.load_extension(f'cogs.{extension}')
    
@bot.command(hidden=True)
@commands.is_owner()
async def unload(ctx,extension):
    bot.unload_extension(f'cogs.{extension}')

for filename in os.listdir('./cogs'):
   if filename.endswith('.py'):
        bot.load_extension(f'cogs.{filename[:-3]}')

@bot.event
async def on_guild_join(guild):
    with open('prefixes.json','r') as f:
        prefixes =json.load(f)
    prefixes[str(guild.id)] = '>>'
    
    with open('prefixes.json','w') as f:
        json.dump(prefixes,f,indent=4)
        
@bot.event
async def on_guild_remove(guild):
    with open('prefixes.json','r') as f:
        prefixes =json.load(f)
    prefixes.pop(str(guild.id))
    
    with open('prefixes.json','w') as f:
        json.dump(prefixes,f,indent=4)
        
        
@bot.command(brief=f'change bot\'s prefix')
@commands.has_guild_permissions(manage_guild=True)
async def prefix(ctx,prefix):
    with open('prefixes.json','r') as f:
        prefixes =json.load(f)
    prefixes[str(ctx.guild.id)] = prefix
    
    with open('prefixes.json','w') as f:
        json.dump(prefixes,f,indent=4)
    await ctx.send(f'Prefix changed to {prefix}')
"""Here you need your bot's token from Developer Portal"""
bot.run('bot token')

Make Sure to paste {} in prefixes.json,if it says ignored error in console,then kick and re-add the bot in the server.

and

ok