Customize Python Discord bot

import json...@client.eventasync def on_guild_join(guild):    with open('guilds.json', 'r') as f:        guilds = json.load(f)    # Set default prefix variable and name of server    guilds[str(guild.id)] = {        "guild Name": guild.name,        "Prefix": "$"    }    # Push dictionary to JSON file    with open('guilds.json', 'w') as f:        json.dump(guilds, f, indent=4)...

...@client.eventasync def on_guild_remove(guild):    with open('guilds.json', 'r') as f:        guilds = json.load(f)    # Remove guild dictionary from JSON file    guilds.pop(str(guild.id))    # Apply changes to file    with open('guilds.json', 'w') as f:        json.dump(guilds, f, indent=4)...

...@client.eventasync def on_message(message):    # Stop the bot from replying to itself or any other bot    if message.author.bot: return    # Send a reply to a human    if message.content == "ping":        await message.channel.send("pong")...

from nextcord.ext import commandsclass <ClassName>(commands.Cog):    # Initialize with `self` and `bot: commands.Bot`    def __init__(self, bot: commands.Bot):        self.bot = bot    # All commands/listeners always take a parameter of "self"    @commands.Cog.listener()    async def <commandName>(self):        # Do some stuffdef setup(bot: commands.Bot):    bot.add_cog(<ClassName>(bot))

...async def on_command_error(self, ctx: commands.Content, error: commands.CommandError):    if isinstance(error, commands.CommandNotFound):        message = f'{error}'    elif isinstance(error, commands.UserInputError):        message = 'Your input was incorrect'    else:        message = 'Something went wrong while running a command'    await ctx.send(message, delete_after=5)    await ctx.message.delete(delay=5)...

import os...# Load extensions on bot startfor filename in os.listdir('./cogs'):    if filename.endswith('.py'):        client.load_extension(f'cogs.{filename[:-3]}')...