python-engineio
Engine.IO server and client for Python
Decision gist · record as of 2026-08-14
Yes. python-engineio is actively maintained, has low install friction, carries a permissive MIT license, and ranks in the top 1000 PyPI packages with no known vulnerabilities. Install it if you need realtime bidirectional communication in a Python application and want automatic transport negotiation between WebSocket and HTTP long-polling.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8 or higher; simple-websocket must be installed as a runtime dependency.
- Low install friction with a single runtime dependency (simple-websocket).
- Active maintenance with a release just 2 days ago and steady commit activity.
License · maintenance · safety
MIT (permissive) — MIT license permits commercial and private use with minimal restrictions; you may use, modify, and distribute this package freely provided you include the license notice.
last release 2026-08-12 (2 days) · last repo commit 2026-08-12 · 257 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 28,662,792 downloads/mo, #831 on PyPI
Alternatives
Verify before relying
pip install python-engineio
import engineio
eio = engineio.Server()
@eio.event
def connect(sid, environ):
print(f'Client {sid} connected')
eio.start_background_task(eio.wait)- Whether the package supports both synchronous and asynchronous usage patterns beyond what the description states.
- Performance characteristics and throughput limits for typical deployments.
- Compatibility with specific ASGI/WSGI frameworks or if it works standalone.
What it is and what it does
python-engineio is a Python implementation of the Engine.IO protocol, which provides realtime bidirectional communication between clients and servers. It handles the low-level transport layer, automatically falling back from WebSocket to HTTP long-polling when needed, making it suitable for applications that require live updates or instant messaging capabilities.
The package acts as both a server and client library, allowing you to build realtime applications without managing transport negotiation yourself. It depends on simple-websocket for WebSocket support and is actively maintained with recent releases. The library is designed for developers building chat applications, live dashboards, collaborative tools, or any system requiring push notifications from server to client.
Use it for
- Building realtime chat or messaging applications where messages must reach clients instantly.
- Creating live notification systems that push updates to connected clients without polling.
- Developing collaborative editing or whiteboarding tools requiring bidirectional sync.
- Implementing live dashboards or monitoring interfaces that update in real time.
- Adding realtime features to web applications that need fallback from WebSocket to HTTP.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
python-engineio is actively maintained, has low install friction, carries a permissive MIT license, and ranks in the top 1000 PyPI packages with no known vulnerabilities. Install it if you need realtime bidirectional communication in a Python application and want automatic transport negotiation between WebSocket and HTTP long-polling.
Install
python-engineio on PyPI
Before you install
Low install friction with a single runtime dependency (simple-websocket). Active maintenance with a release just 2 days ago and steady commit activity. Supports Python 3.8+.
Requires Python 3.8 or higher; simple-websocket must be installed as a runtime dependency.
License in practice
MIT license permits commercial and private use with minimal restrictions; you may use, modify, and distribute this package freely provided you include the license notice.
Quickstart
pip install python-engineio
import engineio
eio = engineio.Server()
@eio.event
def connect(sid, environ):
print(f'Client {sid} connected')
eio.start_background_task(eio.wait)Verify before relying
- Whether the package supports both synchronous and asynchronous usage patterns beyond what the description states.
- Performance characteristics and throughput limits for typical deployments.
- Compatibility with specific ASGI/WSGI frameworks or if it works standalone.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.8 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagesimple-websocket |
| Maintenance | Actively maintained 2 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 28,662,792 / month, #831 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Environment :: Web EnvironmentIntended Audience :: DevelopersOperating System :: OS IndependentProgramming Language :: Python :: 3 |
Evidence: python_engineio-4.13.5-py3-none-any.whl
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See also python-socketio · simple-websocket · Flask-SocketIO · autobahn · ws4py · websocket · fastapi-socketio · gevent-websocket · obs-websocket-py