Greenlets are lightweight coroutines for in-process concurrent programming.
The "greenlet" package is a spin-off of
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 Who is using Greenlet?
There are several libraries that use Greenlet as a more flexible
alternative to Python's built in coroutine support: The easiest way to get Greenlet is to install it with pip: Source code archives and binary distributions are available on the
python package index at https://github.com/python-greenlet/greenlet Documentation is available on readthedocs.org:
pip install greenlet