# twisted > An asynchronous networking framework written in Python - **URL**: https://www.freshcrate.ai/projects/twisted - **Author**: pypi - **Category**: Frameworks - **Latest version**: `twisted-26.4.0` (2026-05-11) - **License**: MIT License - **Source**: https://github.com/twisted/twisted/blob/HEAD/NEWS.rst - **Homepage**: https://pypi.org/project/Twisted/ - **Language**: Python - **GitHub**: 5,961 stars, 1,208 forks - **Registry**: pypi (`twisted`) - **Tags**: `pypi` ## Description Twisted ####### |gitter|_ |rtd|_ |pypi|_ |ci|_ For information on changes in this release, see the `NEWS `_ file. Sponsors -------- Twisted is an MIT-licensed open source project with its ongoing development made possible entirely by the support of community and these awesome sponsors. If you'd like to join them, please consider `sponsoring Twisted's `_ development. |thinkst|_ |sftpplus|_ What is this? ------------- Twisted is a Python event-based framework for internet applications. 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 `_. Documentation and Support ------------------------- Twisted's documentation is available from the `Twisted Matrix Read The Docs website `_. This documentation contains how-tos, code examples, and an API reference. Help is also available on the `Twisted mailing list `_. There is also an IRC channel, ``#twisted``, on the `Libera.Chat `_ network. A web client is available at `web.libera.chat `_. Unit Tests ---------- Twisted has a comprehensive test suite, which can be run by ``tox``:: $ tox -l # to view all test environments $ tox -e nocov # to run all the tests without coverage $ tox -e withcov # to run all the tests with coverage $ tox -e alldeps-withcov-posix # install all dependencies, run tests with coverage on POSIX platform You can test running the test suite under the different reactors with the ``TWISTED_REACTOR`` environment variable:: $ env TWISTED_REACTOR=epoll tox -e alldeps-withcov-posix 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. Static Code Checkers -------------------- You can ensure that code complies to Twisted `coding standards `_:: $ tox -e lint # run pre-commit to check coding stanards $ tox -e mypy # run MyPy static type checker to check for type errors Or, for speed, use pre-commit directly:: $ pipx run pre-commit run Copyright --------- All of the code in this distribution is Copyright (c) 2001-2025 Twisted Matrix Laboratories. Twisted is made available under the MIT license. The included `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 `_ file for specific legal details. .. |pypi| image:: https://img.shields.io/pypi/v/twisted.svg .. _pypi: https://pypi.python.org/pypi/twisted .. |gitter| image:: https://img.shields.io/gitter/room/twisted/twisted.svg .. _gitter: https://gitter.im/twisted/twisted .. |ci| image:: https://github.com/twisted/twisted/actions/workflows/test.yaml/badge.svg .. _ci: https://github.com/twisted/twisted .. |rtd| image:: https://readthedocs.org/projects/twisted/badge/?version=latest&style=flat .. _rtd: https://docs.twistedmatrix. ## Recent releases | Version | Date | Urgency | Changes | | --- | --- | --- | --- | | `twisted-26.4.0` | 2026-05-11 | High | Twisted 26.4.0 (2026-05-11) ============================== This is the last release with support for Python 3.9. Security -------- - twisted.names was fix for Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. Reported and fixed by Tomas Illuminati Balbin CVE-2026-42304 (#12626) Features -------- - twisted.internet.ssl.CertificateOptions has a new constructor argument, contextForServerName, which takes a callback that will get invoked w | | `25.5.0` | 2026-04-21 | Low | Imported from PyPI (25.5.0) | | `twisted-25.5.0` | 2025-06-07 | Low | # Twisted 25.5.0 (2025-06-07) ## Bugfixes - twisted.internet.runner.procmon.ProcessMonitor: startProcess() catches exceptions raised by reactor.spawnProcess() and attempts to restart the failed process. (#12421) ## Deprecations and Removals - twisted.trial.unittest.TestCase.deferSetUp, twisted.trial.unittest.TestCase.deferTestMethod, twisted.trial.unittest.TestCase.deferTearDown, and twisted.trial.unittest.TestCase.deferRunCleanups were removed and converted to priv | | `twisted-25.5.0` | 2025-06-07 | Low | # Twisted 25.5.0 (2025-06-07) ## Bugfixes - twisted.internet.runner.procmon.ProcessMonitor: startProcess() catches exceptions raised by reactor.spawnProcess() and attempts to restart the failed process. (#12421) ## Deprecations and Removals - twisted.trial.unittest.TestCase.deferSetUp, twisted.trial.unittest.TestCase.deferTestMethod, twisted.trial.unittest.TestCase.deferTearDown, and twisted.trial.unittest.TestCase.deferRunCleanups were removed and converted to priv | | `twisted-25.5.0` | 2025-06-07 | Low | # Twisted 25.5.0 (2025-06-07) ## Bugfixes - twisted.internet.runner.procmon.ProcessMonitor: startProcess() catches exceptions raised by reactor.spawnProcess() and attempts to restart the failed process. (#12421) ## Deprecations and Removals - twisted.trial.unittest.TestCase.deferSetUp, twisted.trial.unittest.TestCase.deferTestMethod, twisted.trial.unittest.TestCase.deferTearDown, and twisted.trial.unittest.TestCase.deferRunCleanups were removed and converted to priv | | `twisted-25.5.0` | 2025-06-07 | Low | # Twisted 25.5.0 (2025-06-07) ## Bugfixes - twisted.internet.runner.procmon.ProcessMonitor: startProcess() catches exceptions raised by reactor.spawnProcess() and attempts to restart the failed process. (#12421) ## Deprecations and Removals - twisted.trial.unittest.TestCase.deferSetUp, twisted.trial.unittest.TestCase.deferTestMethod, twisted.trial.unittest.TestCase.deferTearDown, and twisted.trial.unittest.TestCase.deferRunCleanups were removed and converted to priv | | `twisted-25.5.0` | 2025-06-07 | Low | # Twisted 25.5.0 (2025-06-07) ## Bugfixes - twisted.internet.runner.procmon.ProcessMonitor: startProcess() catches exceptions raised by reactor.spawnProcess() and attempts to restart the failed process. (#12421) ## Deprecations and Removals - twisted.trial.unittest.TestCase.deferSetUp, twisted.trial.unittest.TestCase.deferTestMethod, twisted.trial.unittest.TestCase.deferTearDown, and twisted.trial.unittest.TestCase.deferRunCleanups were removed and converted to priv | | `twisted-25.5.0` | 2025-06-07 | Low | # Twisted 25.5.0 (2025-06-07) ## Bugfixes - twisted.internet.runner.procmon.ProcessMonitor: startProcess() catches exceptions raised by reactor.spawnProcess() and attempts to restart the failed process. (#12421) ## Deprecations and Removals - twisted.trial.unittest.TestCase.deferSetUp, twisted.trial.unittest.TestCase.deferTestMethod, twisted.trial.unittest.TestCase.deferTearDown, and twisted.trial.unittest.TestCase.deferRunCleanups were removed and converted to priv | | `twisted-25.5.0` | 2025-06-07 | Low | # Twisted 25.5.0 (2025-06-07) ## Bugfixes - twisted.internet.runner.procmon.ProcessMonitor: startProcess() catches exceptions raised by reactor.spawnProcess() and attempts to restart the failed process. (#12421) ## Deprecations and Removals - twisted.trial.unittest.TestCase.deferSetUp, twisted.trial.unittest.TestCase.deferTestMethod, twisted.trial.unittest.TestCase.deferTearDown, and twisted.trial.unittest.TestCase.deferRunCleanups were removed and converted to priv | | `twisted-25.5.0` | 2025-06-07 | Low | # Twisted 25.5.0 (2025-06-07) ## Bugfixes - twisted.internet.runner.procmon.ProcessMonitor: startProcess() catches exceptions raised by reactor.spawnProcess() and attempts to restart the failed process. (#12421) ## Deprecations and Removals - twisted.trial.unittest.TestCase.deferSetUp, twisted.trial.unittest.TestCase.deferTestMethod, twisted.trial.unittest.TestCase.deferTearDown, and twisted.trial.unittest.TestCase.deferRunCleanups were removed and converted to priv | ## Citation - HTML: https://www.freshcrate.ai/projects/twisted - Markdown: https://www.freshcrate.ai/projects/twisted.md - Dependencies JSON: https://www.freshcrate.ai/api/projects/twisted/deps _Generated by freshcrate.ai. Indexes pypi releases for AI-agent ecosystem packages._