An opinionated, static typed Discord microframework for Python3 and asyncio that supports Discord’s v10 REST and Gateway APIs.
Built on good intentions and the hope that it will be extendable and reusable, rather than an obstacle for future development.
Python 3.8, 3.9, 3.10 and 3.11 are currently supported.
Install Hikari from PyPI with the following command:
python -m pip install -U hikari # Windows users may need to run this instead... py -3 -m pip install -U hikari
Hikari provides two different default bot implementations to suit your needs:
is one which will connect to Discord through the gateway and receive
events through there. A simple startup example could be the following:
import hikari bot = hikari.GatewayBot(token="...") @bot.listen() async def ping(event: hikari.GuildMessageCreateEvent) -> None: """If a non-bot user mentions your bot, respond with 'Pong!'.""" # Do not respond to bots nor webhooks pinging us, only user accounts if not event.is_human: return me = bot.get_me() if me.id in event.message.user_mentions_ids: await event.message.respond("Pong!") bot.run()
This will only respond to messages created in guilds. You can use
DMMessageCreateEvent instead to only listen on
MessageCreateEvent to listen to both DMs and guild-based messages. A full list of events
can be found in the events docs.
If you wish to customize the intents being used in order to change which events your bot is notified about, then you
can pass the
intents kwarg to the
import hikari # the default is to enable all unprivileged intents (all events that do not target the # presence, activity of a specific member nor message content). bot = hikari.GatewayBot(intents=hikari.Intents.ALL, token="...")
The above example would enable all intents, thus enabling events relating to member presences to be received (you’d need to whitelist your application first to be able to start the bot if you do this).
Events are determined by the type annotation on the event parameter, or alternatively as a type passed to the
@bot.listen() decorator, if you do not want to use type hints.
import hikari bot = hikari.GatewayBot("...") @bot.listen() async def ping(event: hikari.MessageCreateEvent): ... # or @bot.listen(hikari.MessageCreateEvent) async def ping(event): ...
spawns an interaction server to which Discord will only send interaction events,
which can be handled and responded to.
An example of a simple
RESTBot could be the following:
import asyncio import hikari # This function will handle the interactions received async def handle_command(interaction: hikari.CommandInteraction): # Create an initial response to be able to take longer to respond yield interaction.build_deferred_response() await asyncio.sleep(5) # Edit the initial response await interaction.edit_initial_response("Edit after 5 seconds!") # Register the commands on startup. # # Note that this is not a nice way to manage this, as it is quite spammy # to do it every time the bot is started. You can either use a command handler # or only run this code in a script using `RESTApp` or add checks to not update # the commands if there were no changes async def create_commands(bot: hikari.RESTBot): application = await bot.rest.fetch_application() await bot.rest.set_application_commands( application=application.id, commands=[ bot.rest.slash_command_builder("test", "My first test command!"), ], ) bot = hikari.RESTBot( token="...", token_type="...", public_key="...", ) bot.add_startup_callback(create_commands) bot.set_listener(hikari.CommandInteraction, handle_command) bot.run()
GatewayBot, registering listeners is done through
.set_listener, and it takes in an interaction type
that the handler will take in.
Note that a bit of a setup is required to get the above code to work. You will need to host the project to the World Wide Web (scary!) and then register the URL on the Discord application portal for your application under “Interactions Endpoint URL”.
A quick way you can get your bot onto the internet and reachable by Discord (for development environment only) is through a tool like ngrok or localhost.run. More information on how to use them can be found in their respective websites.
Common helpful features#
Both implementations take in helpful arguments such as customizing timeouts for requests and enabling a proxy, which are passed directly into the bot during initialization.
Also note that you could pass extra options to
bot.run during development, for example:
import hikari bot = hikari.GatewayBot("...") # or bot = hikari.RESTBot("...", "...") bot.run( asyncio_debug=True, # enable asyncio debug to detect blocking and slow code. coroutine_tracking_depth=20, # enable tracking of coroutines, makes some asyncio # errors clearer. propagate_interrupts=True, # Any OS interrupts get rethrown as errors. )
Many other helpful options exist for you to take advantage of if you wish. Links to the respective docs can be seen below:
You may only want to integrate with the REST API, for example if writing a web dashboard.
This is relatively simple to do:
import hikari import asyncio rest = hikari.RESTApp() async def print_my_user(token): await rest.start() # We acquire a client with a given token. This allows one REST app instance # with one internal connection pool to be reused. async with rest.acquire(token) as client: my_user = await client.fetch_my_user() print(my_user) await rest.close() asyncio.run(print_my_user("user token acquired through OAuth here"))
Optional features can be specified when installing hikari:
server- Install dependencies required to enable Hikari’s standard interaction server (RESTBot) functionality.
speedups- Detailed in
# To install hikari with the speedups feature: python -m pip install -U hikari[speedups] # To install hikari with both the speedups and server features: python -m pip install -U hikari[speedups, server]
You may wish to use a command framework on top of Hikari so that you can start writing a bot quickly without implementing your own command handler.
Hikari does not include a command framework by default, so you will want to pick a third party library to do it:
Making your application more efficient#
As your application scales, you may need to adjust some things to keep it performing nicely.
Python optimization flags#
CPython provides two optimization flags that remove internal safety checks that are useful for development, and change other internal settings in the interpreter.
python bot.py- no optimization - this is the default.
python -O bot.py- first level optimization - features such as internal assertions will be disabled.
python -OO bot.py- second level optimization - more features (including all docstrings) will be removed from the loaded code at runtime.
A minimum of first level of optimization is recommended when running bots in a production environment.
If you have a C compiler (Microsoft VC++ Redistributable 14.0 or newer, or a modern copy of GCC/G++, Clang, etc), it is
recommended you install Hikari using
pip install -U hikari[speedups]. This will install
aiohttp with its available
orjson which will provide you with a substantial performance boost.
If you use a UNIX-like system, you will get additional performance benefits from using a library called
This replaces the default
asyncio event loop with one that uses
libuv internally. You can run
pip install uvloop
and then amend your script to be something similar to the following example to utilise it in your application:
import os if os.name != "nt": import uvloop uvloop.install() # Your code goes here
Eventually, we will start providing the option to use compiled components of this library over pure Python ones if it suits your use case. This should also enable further scalability of your application, should PEP 554 – Multiple Interpreters in the Stdlib be accepted.
Currently, this functionality does not yet exist.
To familiarize yourself a bit with the project, we recommend reading our contributing manual.
If you wish to contribute something, you should first start by cloning the repository.
In the repository, make a virtual environment (
python -m venv .venv) and enter it (
source .venv/bin/activate on
Linux, or for Windows use one of
The first thing you should run is
pip install -r dev-requirements/nox.txt to install nox.
This handles running predefined tasks and pipelines.
Once this is complete, you can run
nox without any arguments to ensure everything builds and is correct.
Where can I start?#
Check out the issues tab on GitHub. If you are nervous, look for issues marked as “good first issue” for something easy to start with!
Feel free to also join our Discord to directly ask questions to the maintainers! They will be glad to help you out and point you in the right direction.