A Cogs Example for the rewrite version of - discord.py

bot_example.py

import discord
from discord.ext import commands

import sys, traceback

"""This is a multi file example showcasing many features of the command extension and the use of cogs.
These are examples only and are not intended to be used as a fully functioning bot. Rather they should give you a basic
understanding and platform for creating your own bot.

These examples make use of Python 3.6.2 and the rewrite version on the lib.

For examples on cogs for the async version:
https://gist.github.com/leovoel/46cd89ed6a8f41fd09c5

Rewrite Documentation:
http://discordpy.readthedocs.io/en/rewrite/api.html

Rewrite Commands Documentation:
http://discordpy.readthedocs.io/en/rewrite/ext/commands/api.html

Familiarising yourself with the documentation will greatly help you in creating your bot and using cogs.
"""


def get_prefix(bot, message):
    """A callable Prefix for our bot. This could be edited to allow per server prefixes."""

    # Notice how you can use spaces in prefixes. Try to keep them simple though.
    prefixes = ['>?', 'lol ', '!?']

    # Check to see if we are outside of a guild. e.g DM's etc.
    if not message.guild:
        # Only allow ? to be used in DMs
        return '?'

    # If we are in a guild, we allow for the user to mention us or use any of the prefixes in our list.
    return commands.when_mentioned_or(*prefixes)(bot, message)


# Below cogs represents our folder our cogs are in. Following is the file name. So 'meme.py' in cogs, would be cogs.meme
# Think of it like a dot path import
initial_extensions = ['cogs.simple',
                      'cogs.members',
                      'cogs.owner']

bot = commands.Bot(command_prefix=get_prefix, description='A Rewrite Cog Example')

# Here we load our extensions(cogs) listed above in [initial_extensions].
if __name__ == '__main__':
    for extension in initial_extensions:
        try:
            bot.load_extension(extension)
        except Exception as e:
            print(f'Failed to load extension {extension}.', file=sys.stderr)
            traceback.print_exc()


@bot.event
async def on_ready():
    """http://discordpy.readthedocs.io/en/rewrite/api.html#discord.on_ready"""

    print(f'\n\nLogged in as: {bot.user.name} - {bot.user.id}\nVersion: {discord.__version__}\n')

    # Changes our bots Playing Status. type=1(streaming) for a standard game you could remove type and url.
    await bot.change_presence(activity=discord.Streaming(name='Cogs Example', url='https://twitch.tv/kraken'))
    print(f'Successfully logged in and booted...!')


bot.run('TOKEN', bot=True, reconnect=True)

members.py

import discord
from discord.ext import commands


class MembersCog(commands.Cog, name="Member Commands"):
    def __init__(self, bot):
        self.bot = bot

    @commands.command()
    @commands.guild_only()
    async def joined(self, ctx, *, member: discord.Member):
        """Says when a member joined."""
        await ctx.send(f'{member.display_name} joined on {member.joined_at}')

    @commands.command(name='coolbot')
    async def cool_bot(self, ctx):
        """Is the bot cool?"""
        await ctx.send('This bot is cool. :)')

    @commands.command(name='top_role', aliases=['toprole'])
    @commands.guild_only()
    async def show_toprole(self, ctx, *, member: discord.Member=None):
        """Simple command which shows the members Top Role."""

        if member is None:
            member = ctx.author

        await ctx.send(f'The top role for {member.display_name} is {member.top_role.name}')
    
    @commands.command(name='perms', aliases=['perms_for', 'permissions'])
    @commands.guild_only()
    async def check_permissions(self, ctx, *, member: discord.Member=None):
        """A simple command which checks a members Guild Permissions.
        If member is not provided, the author will be checked."""

        if not member:
            member = ctx.author

        # Here we check if the value of each permission is True.
        perms = '\n'.join(perm for perm, value in member.guild_permissions if value)

        # And to make it look nice, we wrap it in an Embed.
        embed = discord.Embed(title='Permissions for:', description=ctx.guild.name, colour=member.colour)
        embed.set_author(icon_url=member.avatar_url, name=str(member))

        # \uFEFF is a Zero-Width Space, which basically allows us to have an empty field name.
        embed.add_field(name='\uFEFF', value=perms)

        await ctx.send(content=None, embed=embed)
        # Thanks to Gio for the Command.

# The setup fucntion below is neccesarry. Remember we give bot.add_cog() the name of the class in this case MembersCog.
# When we load the cog, we use the name of the file.
def setup(bot):
    bot.add_cog(MembersCog(bot))

owner.py

from discord.ext import commands


class OwnerCog(commands.Cog, name="Owner Commands"):

    def __init__(self, bot):
        self.bot = bot
    
    # Hidden means it won't show up on the default help.
    @commands.command(name='load', hidden=True)
    @commands.is_owner()
    async def cog_load(self, ctx, *, cog: str):
        """Command which Loads a Module.
        Remember to use dot path. e.g: cogs.owner"""

        try:
            self.bot.load_extension(cog)
        except Exception as e:
            await ctx.send(f'**`ERROR:`** {type(e).__name__} - {e}')
        else:
            await ctx.send('**`SUCCESS`**')

    @commands.command(name='unload', hidden=True)
    @commands.is_owner()
    async def cog_unload(self, ctx, *, cog: str):
        """Command which Unloads a Module.
        Remember to use dot path. e.g: cogs.owner"""

        try:
            self.bot.unload_extension(cog)
        except Exception as e:
            await ctx.send(f'**`ERROR:`** {type(e).__name__} - {e}')
        else:
            await ctx.send('**`SUCCESS`**')

    @commands.command(name='reload', hidden=True)
    @commands.is_owner()
    async def cog_reload(self, ctx, *, cog: str):
        """Command which Reloads a Module.
        Remember to use dot path. e.g: cogs.owner"""

        try:
            self.bot.unload_extension(cog)
            self.bot.load_extension(cog)
        except Exception as e:
            await ctx.send(f'**`ERROR:`** {type(e).__name__} - {e}')
        else:
            await ctx.send('**`SUCCESS`**')


def setup(bot):
    bot.add_cog(OwnerCog(bot))

simple.py

import discord
from discord.ext import commands


"""A simple cog example with simple commands. Showcased here are some check decorators, and the use of events in cogs.

For a list of inbuilt checks:
http://dischttp://discordpy.readthedocs.io/en/rewrite/ext/commands/api.html#checksordpy.readthedocs.io/en/rewrite/ext/commands/api.html#checks

You could also create your own custom checks. Check out:
https://github.com/Rapptz/discord.py/blob/master/discord/ext/commands/core.py#L689

For a list of events:
http://discordpy.readthedocs.io/en/rewrite/api.html#event-reference
http://discordpy.readthedocs.io/en/rewrite/ext/commands/api.html#event-reference
"""


class SimpleCog(commands.Cog, name="Simple Commands"):
    """SimpleCog"""

    def __init__(self, bot):
        self.bot = bot

    @commands.command(name='repeat', aliases=['copy', 'mimic'])
    async def do_repeat(self, ctx, *, our_input: str):
        """A simple command which repeats our input.
        In rewrite Context is automatically passed to our commands as the first argument after self."""

        await ctx.send(our_input)

    @commands.command(name='add', aliases=['plus'])
    @commands.guild_only()
    async def do_addition(self, ctx, first: int, second: int):
        """A simple command which does addition on two integer values."""

        total = first + second
        await ctx.send(f'The sum of **{first}** and **{second}**  is  **{total}**')

    @commands.command(name='me')
    @commands.is_owner()
    async def only_me(self, ctx):
        """A simple command which only responds to the owner of the bot."""

        await ctx.send(f'Hello {ctx.author.mention}. This command can only be used by you!!')

    @commands.command(name='embeds')
    @commands.guild_only()
    async def example_embed(self, ctx):
        """A simple command which showcases the use of embeds.

        Have a play around and visit the Visualizer."""

        embed = discord.Embed(title='Example Embed',
                              description='Showcasing the use of Embeds...\nSee the visualizer for more info.',
                              colour=0x98FB98)
        embed.set_author(name='MysterialPy',
                         url='https://gist.github.com/MysterialPy/public',
                         icon_url='http://i.imgur.com/ko5A30P.png')
        embed.set_image(url='https://cdn.discordapp.com/attachments/84319995256905728/252292324967710721/embed.png')

        embed.add_field(name='Embed Visualizer', value='[Click Here!](https://leovoel.github.io/embed-visualizer/)')
        embed.add_field(name='Command Invoker', value=ctx.author.mention)
        embed.set_footer(text='Made in Python with discord.py@rewrite', icon_url='http://i.imgur.com/5BFecvA.png')

        await ctx.send(content='**A simple Embed for discord.py@rewrite in cogs.**', embed=embed)
    
    @commands.Cog.listener()
    async def on_member_ban(self, guild, user):
        """Event Listener which is called when a user is banned from the guild.
        For this example I will keep things simple and just print some info.
        Notice how because we are in a cog class we do not need to use @bot.event

        For more information:
        http://discordpy.readthedocs.io/en/rewrite/api.html#discord.on_member_ban

        Check above for a list of events.
        """

        print(f'{user.name}-{user.id} was banned from {guild.name}-{guild.id}')

# The setup fucntion below is neccesarry. Remember we give bot.add_cog() the name of the class in this case SimpleCog.
# When we load the cog, we use the name of the file.
def setup(bot):
    bot.add_cog(SimpleCog(bot))

There's been another update to rewrite; now it's necessary to add the @commands.Cog.listener() decorator to your on_member_ban method and any other listeners inside cogs. https://discordpy.readthedocs.io/en/rewrite/ext/commands/api.html#discord.ext.commands.Cog.listener

I DIDN'T SEE THAT EVENT