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Lightweight in-process concurrent programming

tag: 0.3.2

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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/

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

Greenlets are lightweight coroutines in-process concurrent
programming. This package is the py.magic.greenlet module from the `py

.. _py lib:

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`_

.. _Concurrence:
.. _Eventlet:
.. _Gevent:

Getting Greenlet

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

  pip install greenlet
  easy_install greenlet
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