Package: tornado-bedframe
Tornadois a Python web framework and
asynchronous networking library, originally developed atFriendFeed.  By using non-blocking network I/O, Tornado
can scale to tens of thousands of open connections, making it ideal forlong polling,WebSockets, and other
applications that require a long-lived connection to each user.Upgrade notesAs of Tornado 3.2, thebackports.ssl_match_hostnamepackage
must be installed when running Tornado on Python 2.  This will be
installed automatically when usingpiporeasy_install.Quick linksDocumentationSource (github)Mailing listStack OverflowWikiHello, worldHere is a simple “Hello, world” example web app for Tornado:import tornado.ioloop
import tornado.web

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")

application = tornado.web.Application([
    (r"/", MainHandler),
])

if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()This example does not use any of Tornado’s asynchronous features; for
that see thissimple chat room.InstallationAutomatic installation:pip install tornadoTornado is listed inPyPIand
can be installed withpiporeasy_install.  Note that the
source distribution includes demo applications that are not present
when Tornado is installed in this way, so you may wish to download a
copy of the source tarball as well.Manual installation: Download the latest source fromPyPI.tar xvzf tornado-$VERSION.tar.gz
cd tornado-$VERSION
python setup.py build
sudo python setup.py installThe Tornado source code ishosted on GitHub.Prerequisites: Tornado runs on Python 2.6, 2.7, 3.2, and 3.3.  On
Python 2, thebackports.ssl_match_hostnamepackage
must be installed (This will be installed automatically when usingpiporeasy_install); on Python 3 there are no strict
dependencies outside the standard library.  Some Tornado features may
require one of the following optional libraries:unittest2is needed to run
Tornado’s test suite on Python 2.6 (it is unnecessary on more recent
versions of Python)concurrent.futuresis the
recommended thread pool for use with Tornado and enables the use oftornado.netutil.ThreadedResolver.  It is needed only on Python 2;
Python 3 includes this package in the standard library.pycurlis used by the optionaltornado.curl_httpclient.  Libcurl version 7.18.2 or higher is required;
version 7.21.1 or higher is recommended.Twistedmay be used with the classes intornado.platform.twisted.pycaresis an alternative
non-blocking DNS resolver that can be used when threads are not
appropriate.Monotimeadds support for
a monotonic clock, which improves reliability in environments
where clock adjustments are frequent.  No longer needed in Python 3.3.Platforms: Tornado should run on any Unix-like platform, although
for the best performance and scalability only Linux (withepoll)
and BSD (withkqueue) are recommended for production deployment
(even though Mac OS X is derived from BSD and supports kqueue, its
networking performance is generally poor so it is recommended only for
development use).  Tornado will also run on Windows, although this
configuration is not officially supported and is recommended only for
development use.Discussion and supportYou can discuss Tornado onthe Tornado developer mailing list, and report bugs on
theGitHub issue tracker.  Links to additional
resources can be found on theTornado wiki.Tornado is one ofFacebook’s open source technologies. It is available under
theApache License, Version 2.0.This web site and all documentation is licensed underCreative
Commons 3.0.