Twisted

Twisted is an event-driven networking engine written in Python

Twisted is a robust, cross-platform implementation of the Reactor Pattern with lots of extras.

fig - what happens during a callback

Modules

Transport
Protocol
ProtocolFactories
Deferred
Actuators

To update the running code functions on fly

Twisted Web

https://jcalderone.livejournal.com/tag/sixty%20seconds

Plugins

Adding subcommands to thetwistdcommand, as a way to facilitate the deployment of your applications.

Thetapnameattribute of your IServiceMaker provider will be used as the subcommand name in a command like twistd [subcommand][args...], and the options attribute (which should be a usage.Options subclass) will be used to parse the given args.

Taking advantage of twisted.plugin is a two step process:

Define an interface which plugins will be required to implement. This is done using the zope.interface package in the same way one would define an interface for any other purpose. A convention for defining interfaces is do so in a file named likeProjectName/projectname/iprojectname.py. The rest of this document will follow that convention: consider the following interface definition be inMatsim/matsim/imatsim.py, an interface definition module for a hypothetical material simulation package.
At one or more places in your program, invoke twisted.plugin.getPlugins and iterate over its result.

https://twistedmatrix.com/documents/current/core/howto/plugin.html

https://twistedmatrix.com/documents/current/core/howto/tap.html