greenlet · PyPI

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The greenlet package is a spin-off of Stackless, a version of CPython that supports micro-threads called “tasklets”. Tasklets run pseudo-concurrently (typically in a single or a few OS-level threads) and are synchronized with data exchanges on “channels”.

A “greenlet”, on the other hand, is a still more primitive notion of micro-thread with no implicit scheduling; coroutines, in other words. This is useful when you want to control exactly when your code runs. You can build custom scheduled micro-threads on top of greenlet; however, it seems that greenlets are useful on their own as a way to make advanced control flow structures. For example, we can recreate generators; the difference with Python’s own generators is that our generators can call nested functions and the nested functions can yield values too. Additionally, you don’t need a “yield” keyword. See the example in tests/test_generator.py.

Greenlets are provided as a C extension module for the regular unmodified interpreter.

Greenlets are lightweight coroutines for in-process concurrent programming.

Who is using Greenlet?

There are several libraries that use Greenlet as a more flexible alternative to Python’s built in coroutine support:

Concurrence

Eventlet

Gevent

Getting Greenlet

The easiest way to get Greenlet is to install it with pip or easy_install:

pip install greenlet
easy_install greenlet

Source code archives and windows installers are available on the python package index at http://pypi.python.org/pypi/greenlet

The source code repository is hosted on github: https://github.com/python-greenlet/greenlet

The master branch - i.e. the development version - can be installed directly by running one of the following:

pip install greenlet==dev
easy_install greenlet==dev

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0.4.4

Sep 7, 2014

0.4.3

Aug 7, 2014

0.4.2

Jan 7, 2014

0.4.1

Jun 7, 2013

This release

0.4.0

Jun 21, 2012

0.3.4

Feb 11, 2012

0.3.3

Jan 5, 2012

0.3.2

Dec 15, 2011

0.3.1

Apr 5, 2010

0.3

Mar 23, 2010

0.2

Dec 30, 2008

0.1

Jan 10, 2006

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AWS Cloud computing and Security Sponsor

Datadog Monitoring

Depot Continuous Integration

Google Download Analytics

Pingdom Monitoring

Sentry Error logging

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