.. image:: https://github.com/gevent/gevent/workflows/gevent%20testing/badge.svg :target: https://github.com/gevent/gevent/actions
.. image:: https://ci.appveyor.com/api/projects/status/bqxl88yhpho223jg?svg=true :target: https://ci.appveyor.com/project/denik/gevent
.. image:: https://coveralls.io/repos/gevent/gevent/badge.svg?branch=master&service=github :target: https://coveralls.io/github/gevent/gevent?branch=master
.. This file is included in README.rst from the top-level so it is limited to pure ReST markup, not Sphinx.
gevent is a coroutine_ -based Python_ networking library that uses
greenlet <https://greenlet.readthedocs.io>_ to provide a high-level synchronous API on top of the libev_
or libuv_ event loop.
Features include:
libev_ or libuv_.events_ and
queues_).Cooperative sockets with SSL support <http://www.gevent.org/api/index.html#networking>_Cooperative DNS queries <http://www.gevent.org/dns.html>_ performed through a threadpool,
dnspython, or c-ares.Monkey patching utility <http://www.gevent.org/intro.html#monkey-patching>_ to get 3rd party modules to become cooperativegevent.subprocess_)gevent is inspired by eventlet_ but features a more consistent API,
simpler implementation and better performance. Read why others use gevent_ and check out the list of the open source projects based on gevent_.
gevent was written by Denis Bilenko <http://denisbilenko.com/>_.
Since version 1.1, gevent is maintained by Jason Madden for
NextThought <https://nextthought.com>_ (through gevent 21) and
Institutional Shareholder Services <https://www.issgovernance.com>_
with help from the contributors <https://github.com/gevent/gevent/graphs/contributors>_ and is
licensed under the MIT license.
See what's new_ in the latest major release.
Check out the detailed changelog_ for this version.
.. _events: http://www.gevent.org/api/gevent.event.html#gevent.event.Event .. _queues: http://www.gevent.org/api/gevent.queue.html#gevent.queue.Queue .. _gevent.subprocess: http://www.gevent.org/api/gevent.subprocess.html#module-gevent.subprocess
.. _coroutine: https://en.wikipedia.org/wiki/Coroutine .. _Python: http://python.org .. _libev: http://software.schmorp.de/pkg/libev.html .. _libuv: http://libuv.org .. _inspired by eventlet: http://blog.gevent.org/2010/02/27/why-gevent/ .. _use gevent: http://groups.google.com/group/gevent/browse_thread/thread/4de9703e5dca8271 .. _open source projects based on gevent: https://github.com/gevent/gevent/wiki/Projects .. _what's new: http://www.gevent.org/whatsnew_1_5.html .. _changelog: http://www.gevent.org/changelog.html
Read the documentation online at http://www.gevent.org.
Post issues on the bug tracker, discuss and ask open ended
questions on the mailing list, and find announcements and
information on the blog_ and twitter (@gevent)_.
.. _installation:
.. This file is included in README.rst so it is limited to plain ReST markup, not Sphinx.
.. note::
If you are reading this document on the Python Package Index_
(PyPI, https://pypi.org/), it is specific to the version of gevent that
you are viewing. If you are viewing this document on gevent.org, it
refers to the current state of gevent in source control (git
master).
This version of gevent runs on Python 3.8 and up, (for exact details
of tested versions, see the classifiers on the PyPI page or in
setup.py). gevent requires the greenlet <https://greenlet.readthedocs.io>_ library and will install the
cffi_ library by default on Windows. The cffi library will become
the default on all platforms in a future release of gevent.
This version of gevent is also tested on on PyPy 3.10 (7.3.12); it should run on PyPy 3.9 and above. On PyPy, there are no external dependencies.
gevent is tested on Windows, macOS, and Linux, and should run on most other Unix-like operating systems (e.g., FreeBSD, Solaris, etc.)
.. note::
Windows is supported as a tier 2, "best effort," platform. It is suitable for development, but not recommended for production. In particular, PyPy3 on Windows may have issues, especially with subprocesses.
On Windows using the deprecated libev backend, gevent is
limited to a maximum of 1024 open sockets due to
limitations in libev_. This limitation should not exist
with the default libuv backend.
Users of older versions of Python 2 or Python 3 may install an older version of gevent. Note that these versions are generally not supported.
+-------+-------+ |Python |Gevent | |Version|Version| +=======+=======+ |2.5 |1.0.x | | | | +-------+-------+ |2.6 |1.1.x | +-------+-------+ |<= |1.2.x | |2.7.8 | | +-------+-------+ |3.3 |1.2.x | +-------+-------+ |3.4.0 -| 1.3.x | |3.4.2 | | | | | +-------+-------+ |3.4.3 | 1.4.x | | | | | | | +-------+-------+ |3.5.x | 20.9.0| | | | | | | +-------+-------+ |2.7.9 -| | |2.7.18,| 22.10 | |3.6, | | |3.7 | | | | | +-------+-------+
.. note::
This section is about installing released versions of gevent as
distributed on the Python Package Index. For building gevent
from source, including customizing the build and embedded
libraries, see Installing From Source.
.. _Python Package Index: http://pypi.org/project/gevent
gevent and greenlet can both be installed with pip, e.g., pip install gevent. Installation using buildout <http://docs.buildout.org/en/latest/> is also supported.
On Windows, macOS, and Linux, both gevent and greenlet are
distributed as binary wheels_.
.. tip::
You need Pip 8.0 or later, or buildout 2.10.0 to install the binary
wheels on Windows or macOS. On Linux, you'll need pip 19 <https://github.com/pypa/pip/pull/5008>_ to install the
manylinux2010 wheels.
.. tip::
While the x86-64 binaries are considered production quality, they are built with relatively low optimization levels and no hardware specific optimizations. Serious production users are encouraged to install from source with appropriate compiler flags.
.. tip::
Beginning with gevent 20.12.0, 64-bit ARM binaries are distributed
on PyPI for aarch64 manylinux2014 compatible systems. Installing these
needs a very recent version of pip. These wheels do not
contain the c-ares resolver, are not tested, and are built with
very low levels of optimizations. Serious production users of
gevent on 64-bit ARM systems are encouraged to build their own
binary wheels.
Beginning with gevent 22.10.0, ppc64le binaries are distributed on PyPI. The same caveats apply as for 64-bit ARM binaries. Using them for anything other than local development is discouraged.
Beginning with gevent 23, muslinux aarch64 and S390X binaries are distributed on PyPI. The same caveats apply as for 64-bit ARM binaries. Using them for anything other than local development is discouraged.
If you are unable to use the binary wheels (for platforms where no
pre-built wheels are available or if wheel installation is disabled),
you can build gevent from source. A normal pip install will
fall back to doing this if no binary wheel is available. See
Installing From Source_ for more, including common installation issues.
There are a number
of additional libraries that extend gevent's functionality and will be
used if they are available. All of these may be installed using
setuptools extras <https://setuptools.readthedocs.io/en/latest/setuptools.html#declaring-extras-optional-features-with-their-own-dependencies>_,
as named below, e.g., pip install gevent[events].
events
In versions of gevent up to and including 20.5.0, this provided configurable
event support using zope.event <https://pypi.org/project/zope.event>_ and was highly
recommended.
In versions after that, this extra is empty and does nothing. It
will be removed in gevent 21.0.
dnspython
Enables a pure-Python resolver, backed by dnspython <https://pypi.org/project/dnspython>. On Python 2, this also
includes idna <https://pypi.org/project/idna>. They can be
installed with the dnspython extra.
.. note:: This is not compatible with Python 3.10+ or dnspython 2.
monitor
Enhancements to gevent's self-monitoring capabilities. This
includes the psutil <https://pypi.org/project/psutil>_ library
which is needed to monitor memory usage. (Note that this may not
build on all platforms.)
recommended A shortcut for installing suggested extras together. This includes the non-test extras defined here, plus additions that improve gevent's operation on certain platforms (for example, in the past, it has included backports of newer APIs).
test Everything needed to run the complete gevent test suite.
.. _pip: https://pip.pypa.io/en/stable/installing/
.. _wheels: http://pythonwheels.com
.. _gevent 1.5: whatsnew_1_5.html
.. _Installing From Source: https://www.gevent.org/development/installing_from_source.html
.. _cffi: https://cffi.readthedocs.io
.. _limitations in libev: http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#WIN32_PLATFORM_LIMITATIONS_AND_WORKA
.. _bug tracker: https://github.com/gevent/gevent/issues .. _mailing list: http://groups.google.com/group/gevent .. _blog: https://dev.nextthought.com/blog/categories/gevent.html .. _twitter (@gevent): http://twitter.com/gevent
FAQs
Coroutine-based network library
We found that gevent demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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