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
9 maintainers
Metadata
9 maintainers
Release files for greenlet 0.4.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
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|---|---|---|---|---|
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Built distributions (wheels)
Total release size: 2.4 MB
Release files / greenlet-0.4.0.zip
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Release files / greenlet-0.4.0.win-amd64-py3.3.exe
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Release files / greenlet-0.4.0.win-amd64-py3.2.exe
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Release files / greenlet-0.4.0.win-amd64-py3.1.exe
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Release files / greenlet-0.4.0.win-amd64-py2.7.exe
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Release files / greenlet-0.4.0.win32-py3.3.exe
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Release files / greenlet-0.4.0.win32-py3.2.exe
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Release files / greenlet-0.4.0.win32-py3.1.exe
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Release files / greenlet-0.4.0-py3.3-win-amd64.egg
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Release files / greenlet-0.4.0-py3.1-win-amd64.egg
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