eventlet
Highly concurrent networking library
Decision gist · record as of 2026-08-14
No for new projects—the maintainers explicitly discourage new usage and recommend asyncio instead. Yes-with-conditions if you are already maintaining eventlet code and need stability fixes or are actively migrating to asyncio. The library is actively maintained for bug fixes but will not receive new features, and retirement is planned.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low friction installation with only two runtime dependencies (dnspython, greenlet).
- Actively maintained as of the latest release, though the project explicitly discourages new usage and is planning eventual retirement.
License · maintenance · safety
MIT (permissive) — MIT license is permissive and imposes no significant restrictions on use, modification, or distribution.
last release 2026-08-14 (0 days) · last repo commit 2026-08-14 · 1,275 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 7,514,505 downloads/mo, #1,729 on PyPI
Alternatives
Verify before relying
pip install eventlet
import eventlet
from eventlet import spawn
def hello():
print('Hello from greenlet')
spawn(hello).wait()- Whether existing eventlet codebases can be migrated to asyncio without major rewrites
- Performance characteristics compared to native asyncio in modern Python versions
- Timeline and concrete plan for eventlet's retirement
What it is and what it does
Eventlet is a concurrent networking library that lets you write network code in a blocking style while gaining the scalability benefits of non-blocking I/O through coroutines and greenlets. It uses epoll or libevent under the hood to handle many concurrent connections efficiently. The library has been around since its early releases but is now in maintenance-only mode: the maintainers explicitly discourage new projects from adopting it and recommend using asyncio instead, which is now part of the Python standard library. Eventlet will only receive stability and bug fixes going forward, with no new features except those supporting migration to asyncio. If you're starting a new project, the maintainers suggest using asyncio; if you already depend on eventlet, the project provides migration guidance.
Use it for
- Maintaining or extending existing eventlet-based applications that predate asyncio adoption
- Running legacy network services that were built with eventlet's coroutine model
- Gradual migration of eventlet code to asyncio using the project's migration tools
- Educational exploration of how coroutine-based concurrency works before moving to asyncio
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
No for new projects—the maintainers explicitly discourage new usage and recommend asyncio instead.
Yes-with-conditions if you are already maintaining eventlet code and need stability fixes or are actively migrating to asyncio. The library is actively maintained for bug fixes but will not receive new features, and retirement is planned.
Install
eventlet on PyPI
Before you install
Low friction installation with only two runtime dependencies (dnspython, greenlet). Actively maintained as of the latest release, though the project explicitly discourages new usage and is planning eventual retirement.
Requires Python 3.10 or later.
License in practice
MIT license is permissive and imposes no significant restrictions on use, modification, or distribution.
Quickstart
pip install eventlet
import eventlet
from eventlet import spawn
def hello():
print('Hello from greenlet')
spawn(hello).wait()Verify before relying
- Whether existing eventlet codebases can be migrated to asyncio without major rewrites
- Performance characteristics compared to native asyncio in modern Python versions
- Timeline and concrete plan for eventlet's retirement
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 2 packagesdnspythongreenlet |
| Maintenance | Actively maintained 0 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 7,514,505 / month, #1,729 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseOperating System :: MacOS :: MacOS XOperating System :: Microsoft :: WindowsOperating System :: POSIXProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: InternetTopic :: Software Development :: Libraries :: Python Modules |
Evidence: eventlet-0.41.2-py3-none-any.whl
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