nerimity-sdk 0.2.2

A fully-featured Python SDK for building Nerimity bots

nerimity-sdk

A Python library for building bots on Nerimity.

pip install nerimity-sdk

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How it works

You create a Bot, attach handlers to it with decorators, then call bot.run(). The bot connects to Nerimity over a WebSocket, receives events, and dispatches them to your handlers.

Nerimity server
      │
      │  WebSocket (Socket.IO)
      ▼
  GatewayClient          ← receives raw events, puts them in a queue
      │
      ▼
  EventEmitter           ← deserializes events into typed objects, calls your handlers
      │
      ├── @bot.on("message:created")   ← your event listeners
      ├── @bot.command("ping")         ← prefix commands  (!ping)
      ├── @bot.slash("info")           ← slash commands   (/info)
      └── @bot.button("confirm:*")     ← button clicks

Everything your handlers need is in the ctx (Context) object passed to them.

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Quickstart

1. Get a bot token

Go to nerimity.com/app/settings/developer/applications, create an application, add a Bot, and copy the token.

2. Scaffold a project

nerimity create my-bot
cd my-bot
cp .env.example .env   # paste your token in here
python bot.py

3. Or start from scratch

# bot.py
import os
from dotenv import load_dotenv
from nerimity_sdk import Bot

load_dotenv()
bot = Bot(token=os.environ["NERIMITY_TOKEN"], prefix="!")

@bot.on("ready")
async def on_ready(me):
    print(f"Logged in as {me.username}#{me.tag}")

@bot.command("ping", description="Replies with Pong!")
async def ping(ctx):
    await ctx.reply("Pong! 🏓")

bot.run()

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Core concepts

The Bot object

bot = Bot(
    token=os.environ["NERIMITY_TOKEN"],
    prefix="!",          # prefix for commands like !ping
)

bot.run() is blocking — it connects and stays connected until you Ctrl+C.

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Event listeners

Listen to anything happening on Nerimity:

@bot.on("message:created")
async def on_message(event):
    # event is a typed MessageCreatedEvent — not a raw dict
    print(event.message.content)

@bot.on("server:member_joined")
async def on_join(event):
    print(f"{event.member.user.username} joined {event.server_id}")

@bot.on("*")  # wildcard — fires for every event
async def log_everything(event):
    print(event)

Every event is a typed dataclass — you get autocomplete, not event["data"]["user"]["id"] chains.

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Prefix commands

Commands triggered by a message starting with your prefix (e.g. !ping):

@bot.command("ping", description="Replies with Pong!")
async def ping(ctx):
    await ctx.reply("Pong!")

With argument converters — ctx.args are already the right types:

from nerimity_sdk import Int, MemberConverter

@bot.command("add", description="Add two numbers", args=[Int, Int])
async def add(ctx):
    a, b = ctx.args   # guaranteed ints, friendly error if user types garbage
    await ctx.reply(f"{a} + {b} = {a + b}")

@bot.command("kick", args=[MemberConverter], guild_only=True)
async def kick(ctx):
    member = ctx.args[0]   # a Member object, not a raw string
    if not await ctx.confirm(f"Kick {member.user.username}?"):
        return await ctx.reply("Cancelled.")
    await ctx.rest.kick_member(ctx.server_id, member.user.id)
    await ctx.reply("Done.")

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The Context object (ctx)

Every command handler receives a ctx with everything you need:

ctx.author          # User who sent the message
ctx.server          # Server it was sent in (None in DMs)
ctx.channel_id      # Where to reply
ctx.args            # Parsed arguments
ctx.flags           # --flag=value flags
ctx.mentions        # [@:id] mentions resolved to User objects

await ctx.reply("hello")                    # send a message
await ctx.react("👍")                       # react to the message
await ctx.ask("What's your name?")          # wait for a follow-up
await ctx.confirm("Are you sure?")          # yes/no prompt → True/False/None
await ctx.author.send(bot.rest, "Hi!")      # send a DM

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Slash commands

Registered with Nerimity's API and shown in the / menu:

@bot.slash("info", description="Show bot info")
async def info(sctx):
    await sctx.reply(f"Running nerimity-sdk")

@bot.slash("ban", description="Ban a user", args_hint="<user_id>")
async def ban(sctx):
    await sctx.defer()   # ack immediately if this will take a moment
    user_id = sctx.args[0] if sctx.args else None
    if not user_id:
        return await sctx.reply("Usage: /ban <user_id>")
    await sctx.rest.ban_member(sctx.server_id, user_id)
    await sctx.reply(f"Banned.")

Slash commands are automatically synced to Nerimity when the bot starts.

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Buttons

from nerimity_sdk import Button, ComponentRow

@bot.command("poll")
async def poll(ctx):
    msg = await ctx.reply("Vote!")

    # Register handlers for the buttons on this specific message
    @bot.button(f"vote:yes:{msg.id}", ttl=300)   # expires after 5 min
    async def on_yes(bctx):
        await bctx.reply(f"{bctx.user.username} voted Yes!")

    @bot.button(f"vote:no:{msg.id}", ttl=300)
    async def on_no(bctx):
        await bctx.reply(f"{bctx.user.username} voted No!")

Use {name} segments to capture dynamic parts:

@bot.button("confirm:{action}:{target}")
async def on_confirm(bctx):
    action = bctx.params["action"]   # e.g. "delete"
    target = bctx.params["target"]   # e.g. "msg_123"
    await bctx.reply(f"Confirmed: {action} on {target}")

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Error handling

Without error handlers, errors are logged but don't crash the bot. With them, you can send a friendly message to the user:

@bot.on_command_error
async def on_error(ctx, error):
    await ctx.reply(f"❌ {error}")

@bot.on_slash_error
async def on_slash_error(sctx, error):
    await sctx.reply(f"❌ {error}")

@bot.on_button_error
async def on_button_error(bctx, error):
    await bctx.reply(f"❌ {error}")

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Plugins

Split your bot into reloadable modules:

# plugins/welcome.py
from nerimity_sdk import PluginBase, listener, mention

class WelcomePlugin(PluginBase):
    name = "welcome"

    @listener("server:member_joined")
    async def on_join(self, event):
        await self.bot.rest.create_message(
            "YOUR_CHANNEL_ID",
            f"👋 Welcome {mention(event.member.user.id)}!"
        )

async def setup(bot):
    await bot.plugins.load(WelcomePlugin())

Load it:

await bot.plugins.load_from_path("plugins/welcome.py")

# Hot-reload without restarting:
await bot.plugins.reload("welcome")

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Persistent storage

Save data between restarts:

from nerimity_sdk import JsonStore

bot = Bot(token=..., store=JsonStore("data.json"))

# In any command:
await bot.store.set(f"guild:{ctx.server_id}:prefix", "?")
prefix = await bot.store.get(f"guild:{ctx.server_id}:prefix") or "!"

Swap JsonStore for SqliteStore or RedisStore with no other code changes.

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Scheduled tasks

@bot.cron("0 9 * * 1")   # every Monday at 09:00 UTC
async def weekly():
    await bot.rest.create_message("CHANNEL_ID", "Good morning!")

Requires pip install "nerimity-sdk[cron]".

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Waiting for events

# Wait for a specific member to join
event = await bot.wait_for(
    "server:member_joined",
    check=lambda e: e.member.user.id == "12345",
    timeout=60,
)

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Paginator

For long responses like help menus or leaderboards:

from nerimity_sdk import Paginator

@bot.command("help")
async def help_cmd(ctx):
    pages = bot.router.help_text().split("\n\n")
    await Paginator(pages).send(ctx)

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Mention helpers

from nerimity_sdk import mention

mention("123456")          # → "[@:123456]"  (use in messages to ping someone)
ctx.mentions               # list of User objects mentioned in the command message

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CLI tools

nerimity create my-bot    # scaffold a new project
nerimity version          # show SDK version
nerimity lint             # check your bot code for common mistakes
nerimity-help             # quick reference in your terminal

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Optional extras

pip install "nerimity-sdk[cron]"     # @bot.cron() scheduled tasks
pip install "nerimity-sdk[watch]"    # watch=True auto-reload plugins on save
pip install "nerimity-sdk[sqlite]"   # SqliteStore
pip install "nerimity-sdk[redis]"    # RedisStore

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Full docs

https://joddabodscripts.github.io/Nerimity-SDK/

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Built by @Lyney:SHOW on Nerimity · JoddabodScripts on GitHub