Network programming with the Twisted framework, Part 1

Friday, 27 June 2003, 12:27 PM EST

Twisted is an increasingly popular pure-Python framework for programming network services and applications. While there are a large number of loosely coupled modular components within Twisted, a central concept to the framework is the idea of non-blocking asynchronous servers. In this article, David introduces you to this style of programming -- a novel one for developers accustomed to threading or forking servers, but one capable of great efficiency under heavy loads.

Sorting through the Twisted framework is reminiscent of the old story about blind men and elephants. Twisted has many capabilities, and it takes a bit of a paradigm switch to get a good sense of why they are all there. In fact, as I write this first installment, I am probably only halfway toward getting my mind fully around Twisted. We can work through it together.

One of the strengths of recent versions of Python is that they come with "batteries included" -- that is, the standard distribution includes modules to do just about everything you want to accomplish in most programming tasks. For the most part, when you want a third-party Python module or package, it is to accomplish some specialized and unusual task. Twisted is one of few exceptions to the pattern described; developed by Twisted Matrix Laboratories, it is a well-designed and general-purpose collection of modules for performing all manner of network programming tasks, in ways not easily facilitated by Python's standard library.

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