notifykit 0.3.0

A modern efficient Python toolkit for building applications that need to watch filesystem changes

👀 A cross-platform filesystem watcher toolkit for Python

notifykit is a set of components for building modern Python applications with a need for watching filesystem events efficiently.

[!Note] notifykit has been running successfully in production for 2+ years.

Installation

pip install notifykit
# or
uv add notifykit

notifykit is available for:

CPython 3.10+ on the following platforms:

• Linux: x86_64, aarch64, x86, armv7, s390x, ppc64le, musl-x86_64, musl-aarch64
• MacOS: x86_64 & arm64
• Windows: x64 & x86

PyPy 3.11+ on the following platforms:

• Linux: x86_64 & aarch64
• MacOS: x86_64

Usage

import asyncio
from pathlib import Path

from notifykit import Notifier, CommonFilter


async def watch(watched_dir: Path) -> None:
    notifier = Notifier(
        debounce_ms=200,
        filter=CommonFilter(),
    )
    await notifier.watch([watched_dir])

    async for events in notifier:
        # process your events
        print(events)


if __name__ == "__main__":
    watched_dir = Path("./watched_dir")
    watched_dir.mkdir(exist_ok=True)

    asyncio.run(watch(watched_dir))

Features

• Simple Modern Pythonic API (async)
• High Performance
• Cross-platform (Linux, MacOS, Windows)
• Built-in event filtering (CommonFilter, custom EventFilter subclasses)
• Easy to mock in tests
• Makes common cases easy and advanced cases possible

Sources of Inspiration

• https://github.com/seb-m/pyinotify/issues
• https://github.com/absperf/asyncinotify/
• https://docs.rs/notify/latest/notify/
• https://github.com/samuelcolvin/watchfiles
• https://github.com/pantsbuild/pants/tree/612e891e90432e994327b6ddaf57502366a714c0/src/rust/engine
• https://github.com/pola-rs/polars/blob/d0c8de592b71d4b934b1598926536f03e10007bd/py-polars/src/file.rs#L206
• https://github.com/TheoBabilon/async-tail/