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Lightweight in-process concurrent programming

Project Description

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:

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

Release history Release notifications

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0.4.13

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0.4.12

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0.4.11

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0.4.10

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0.4.0

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0.3.4

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Filename, size & hash SHA256 hash help File type Python version Upload date
greenlet-0.4.0-py2.4-win32.egg (11.5 kB) Copy SHA256 hash SHA256 Egg 2.4 Jun 21, 2012
greenlet-0.4.0-py2.5-win32.egg (11.6 kB) Copy SHA256 hash SHA256 Egg 2.5 Jun 21, 2012
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greenlet-0.4.0-py2.7-win-amd64.egg (13.6 kB) Copy SHA256 hash SHA256 Egg 2.7 Jun 21, 2012
greenlet-0.4.0-py3.1-win32.egg (13.1 kB) Copy SHA256 hash SHA256 Egg 3.1 Jun 21, 2012
greenlet-0.4.0-py3.1-win-amd64.egg (13.8 kB) Copy SHA256 hash SHA256 Egg 3.1 Jun 21, 2012
greenlet-0.4.0-py3.2-win32.egg (12.9 kB) Copy SHA256 hash SHA256 Egg 3.2 Jun 21, 2012
greenlet-0.4.0-py3.2-win-amd64.egg (13.6 kB) Copy SHA256 hash SHA256 Egg 3.2 Jun 21, 2012
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greenlet-0.4.0.win32-py2.4.exe (76.5 kB) Copy SHA256 hash SHA256 Windows Installer 2.4 Jun 21, 2012
greenlet-0.4.0.win32-py2.5.exe (76.6 kB) Copy SHA256 hash SHA256 Windows Installer 2.5 Jun 21, 2012
greenlet-0.4.0.win32-py2.6.exe (212.8 kB) Copy SHA256 hash SHA256 Windows Installer 2.6 Jun 21, 2012
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greenlet-0.4.0.win32-py3.1.exe (212.8 kB) Copy SHA256 hash SHA256 Windows Installer 3.1 Jun 21, 2012
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greenlet-0.4.0.win-amd64-py2.7.exe (241.0 kB) Copy SHA256 hash SHA256 Windows Installer 2.7 Jun 21, 2012
greenlet-0.4.0.win-amd64-py3.1.exe (241.7 kB) Copy SHA256 hash SHA256 Windows Installer 3.1 Jun 21, 2012
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greenlet-0.4.0.zip (72.8 kB) Copy SHA256 hash SHA256 Source None Jun 21, 2012

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