Twisted makes it easy to implement custom network applications. Here's a TCP server that echoes back everything that's written to it:

Along with connection to servers across the internet, Twisted also connects to local processes with much the same API. The API is described in more detail in the documentation of:

Welcome to the Twisted documentation! ¶ Contents: Installing Twisted Installing Optional Dependencies Twisted Core Developer Guides Examples Specifications Development of Twisted Twisted Conch …

After reading this document, the reader should expect to be able to deal with most simple APIs in Twisted and Twisted-using code that return Deferreds.

Jun 7, 2025 · API Documentation for Twisted, generated by pydoctor 24.11.2 at 2025-06-07 09:53:28.

This section describes the optional dependencies that Twisted supports. The dependencies are python packages that Twisted’s developers have found useful either for developing Twisted itself or for …

Jun 7, 2025 · Set an outgoing HTTP cookie. In general, you should consider using sessions instead of cookies, see twisted.web.server.Request.getSession and the twisted.web.server.Session class for …

Twisted tackles this problem with Deferred s, a type of object designed to do one thing, and one thing only: encode an order of execution separately from the order of lines in Python source code.

stdiodemo.py - example using stdio, Deferreds, LineReceiver and twisted.web.client. ptyserv.py - serve shells in pseudo-terminals over TCP courier.py - example of interfacing to Courier’s mail filter …

This document is for readers new to Twisted who are familiar with the Python programming language and, at least conceptually, with core networking concepts such as servers, clients and sockets.