Simple and minimal Discord bot made using discord.py for assigning a specific role when a user reacts to a given message.

reaction_role_bot.py

import discord

BOT_TOKEN = '(bot token here)'
MESSAGE_ID = 1234
EMOJI_NAME = 'emojiName'
ROLE_ID = 4321


class ReactionRole(discord.Client):

    async def on_raw_reaction_add(self, payload):
        await self.add_remove_role(payload)

    async def on_raw_reaction_remove(self, payload):
        await self.add_remove_role(payload)

    async def add_remove_role(self, payload):
        if payload.message_id != MESSAGE_ID:
            return
        if payload.emoji.name != EMOJI_NAME:
            return
        guild = self.get_guild(payload.guild_id)
        if guild is None:
            return

        member = guild.get_member(payload.user_id)
        role = guild.get_role(ROLE_ID)
        if not member or not role:
            return

        if payload.event_type == 'REACTION_ADD':
            print(f'Adding {role} to {member}')
            await member.add_roles(role)
        elif payload.event_type == 'REACTION_REMOVE':
            print(f'Removing {role} from {member}')
            await member.remove_roles(role)


intents = discord.Intents.default()
intents.members = True

client = ReactionRole(intents=intents)
client.run(BOT_TOKEN)

This is mostly for my own reference. This is a very simple bot I needed and most of the stuff out there was overly complicated or bloated. This is very minimal, and doesn't have anything extra. It's looking for one emote on one message, and it adds/removes one role from whichever user reactions or unreacts on that messages.

You can easily expand this to handle multiple roles/emotes/messages if you're familiar with Python, but this code should give you a quick idea of what the base is on the discord API side.