Overview
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Eventlet is a concurrent networking library for Python that allows you to change how you run your code, not how you write it.
It uses epoll or libevent for highly scalable non-blocking I/O. Coroutines ensure that the developer uses a blocking style of programming that is similar to threading, but provide the benefits of non-blocking I/O. The event dispatch is implicit, which means you can easily use Eventlet from the Python interpreter, or as a small part of a larger application.
It's easy to get started using Eventlet, and easy to convert existing applications to use it. Start off by looking at the examples, common design patterns, and the list of basic API primitives.
Quick Example
Here's something you can try right on the command line:
% python >>> import eventlet >>> from eventlet.green import urllib2 >>> gt = eventlet.spawn(urllib2.urlopen, 'http://eventlet.net') >>> gt2 = eventlet.spawn(urllib2.urlopen, 'http://secondlife.com') >>> gt2.wait() >>> gt.wait()
Getting Eventlet
The easiest way to get Eventlet is to use pip:
pip install eventlet
The development tip is available as well:
pip install 'eventlet==dev'
Building the Docs Locally
To build a complete set of HTML documentation, you must have Sphinx, which can be found at http://sphinx.pocoo.org/ (or installed with pip install Sphinx):
cd doc make html
The built html files can be found in doc/_build/html afterward.
Twisted
Eventlet had Twisted hub in the past, but community interest to this integration has dropped over time, now it is not supported, so with apologies for any inconvenience we discontinue Twisted integration.
If you have a project that uses Eventlet with Twisted, your options are:
- use last working release eventlet==0.14
- start a new project with only Twisted hub code, identify and fix problems. As of eventlet 0.13, EVENTLET_HUB environment variable can point to external modules.
- fork Eventlet, revert Twisted removal, identify and fix problems. This work may be merged back into main project.
Apologies for any inconvenience.