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* ci: drop dlltool from nodejs libs release * nodejs: download libsimplex into the user cache * nodejs: load libsimplex at runtime per backend * support bot: select db backend with --db * python: match backend switch error text * nodejs: download prebuilt add-on at runtime * ci: build nodejs add-on for libs release * calculator bot: load libs and add-on in image * support bot: document add-on override * nodejs: keep worker test output free of colors * nodejs: verify sha-256 of downloaded assets * python: pin core libs release with sha-256 * ci: add packages release script * ci: release nodejs add-on and open release PR * ci: publish packages after release PR * nodejs: keep npm from building the add-on * calculator bot: build the add-on in the image * ci: merge package release workflows * ci: open release PR when publishing fails * ci: build the add-on with node-addon-api only * ci: skip publishing in a called packages workflow * ci: update package release actions to Node 24 * nodejs: fix receive test timeout * ci: test packages on pull requests * nodejs: reuse the database in the close stress test * ci: keep failed package tests from hanging * ci: skip preset server tests * ci: plan package builds from the changes * ci: test packages with a given libsimplex * ci: test packages with libsimplex of core changes
SimpleX Chat Python library
Python 3.11+ client for SimpleX Chat bots. Equivalent to the Node.js library.
Install
pip install simplex-chat
The native libsimplex is downloaded lazily on first use. To pre-fetch:
python -m simplex_chat install # sqlite (default)
python -m simplex_chat install --backend postgres # linux-x86_64 only
Quick start
import re
from simplex_chat import Bot, BotProfile, Message, SqliteDb, TextMessage
bot = Bot(
profile=BotProfile(display_name="Squaring bot"),
db=SqliteDb(file_prefix="./squaring_bot"),
welcome="Send me a number, I'll square it.",
)
@bot.on_message(content_type="text", text=re.compile(r"^-?\d+(\.\d+)?$"))
async def square(msg: TextMessage) -> None:
n = float(msg.text or "0")
await msg.reply(f"{n} * {n} = {n * n}")
@bot.on_message(content_type="text")
async def fallback(msg: Message) -> None:
await msg.reply("Send me a number, like 7 or 3.14.")
if __name__ == "__main__":
bot.run()
bot.run() blocks. The connection address is logged on startup — paste it into a SimpleX client to talk to the bot. Ctrl+C to stop.
Three decorators: @bot.on_message(...), @bot.on_command(name), @bot.on_event(tag). Message handlers are first-match-wins in registration order, so register specific filters first and catch-alls last.
See examples/squaring_bot.py for the full example.
Development
uv venv && source .venv/bin/activate
uv pip install -e '.[dev]'
ruff check && pyright && pytest tests/
Wire types under src/simplex_chat/types/_*.py are generated. Regenerate with cabal test simplex-chat-test --test-options='--match Python'.
Release
Manual for now. Bump _version.py:__version__, build a wheel, upload to PyPI:
uv build --wheel
uv publish --token "$PYPI_TOKEN"