Twisted
=======
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For information on changes in this release, see the `NEWS <NEWS.rst>`_ file.
What is this?
-------------
Twisted is an event-based framework for internet applications, supporting Python 2.7 and Python 3.5+.
It includes modules for many different purposes, including the following:
- ``twisted.web``: HTTP clients and servers, HTML templating, and a WSGI server
- ``twisted.conch``: SSHv2 and Telnet clients and servers and terminal emulators
- ``twisted.words``: Clients and servers for IRC, XMPP, and other IM protocols
- ``twisted.mail``: IMAPv4, POP3, SMTP clients and servers
- ``twisted.positioning``: Tools for communicating with NMEA-compatible GPS receivers
- ``twisted.names``: DNS client and tools for making your own DNS servers
- ``twisted.trial``: A unit testing framework that integrates well with Twisted-based code.
Twisted supports all major system event loops -- ``select`` (all platforms), ``poll`` (most POSIX platforms), ``epoll`` (Linux), ``kqueue`` (FreeBSD, macOS), IOCP (Windows), and various GUI event loops (GTK+2/3, Qt, wxWidgets).
Third-party reactors can plug into Twisted, and provide support for additional event loops.
Installing
----------
To install the latest version of Twisted using pip::
$ pip install twisted
Additional instructions for installing this software are in `the installation instructions <INSTALL.rst>`_.
Documentation and Support
-------------------------
Twisted's documentation is available from the `Twisted Matrix website <https://twistedmatrix.com/documents/current/>`_.
This documentation contains how-tos, code examples, and an API reference.
Help is also available on the `Twisted mailing list <https://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python>`_.
There is also a pair of very lively IRC channels, ``#twisted`` (for general Twisted questions) and ``#twisted.web`` (for Twisted Web), on ``chat.freenode.net``.
Unit Tests
----------
Twisted has a comprehensive test suite, which can be run by ``tox``::
$ tox -l # to view all test environments
$ tox -e py27-tests # to run the tests for Python 2.7
$ tox -e py35-tests # to run the tests for Python 3.5
You can test running the test suite under the different reactors with the ``TWISTED_REACTOR`` environment variable::
$ env TWISTED_REACTOR=epoll tox -e py27-tests
Some of these tests may fail if you:
* don't have the dependencies required for a particular subsystem installed,
* have a firewall blocking some ports (or things like Multicast, which Linux NAT has shown itself to do), or
* run them as root.
Copyright
---------
All of the code in this distribution is Copyright (c) 2001-2020 Twisted Matrix Laboratories.
Twisted is made available under the MIT license.
The included `LICENSE <LICENSE>`_ file describes this in detail.
Warranty
--------
THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
TO THE USE OF THIS SOFTWARE IS WITH YOU.
IN NO EVENT WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
AND/OR REDISTRIBUTE THE LIBRARY, BE LIABLE TO YOU FOR ANY DAMAGES, EVEN IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES.
Again, see the included `LICENSE <LICENSE>`_ file for specific legal details.
.. |pypi| image:: http://img.shields.io/pypi/v/twisted.svg
.. _pypi: https://pypi.python.org/pypi/twisted
.. |travis| image:: https://travis-ci.org/twisted/twisted.svg?branch=trunk
.. _travis: https://travis-ci.org/twisted/twisted
.. |circleci| image:: https://circleci.com/gh/twisted/twisted.svg?style=svg
.. _circleci: https://circleci.com/gh/twisted/twisted
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