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2. Python 2.7 and Python 3.x

At this writing, both Python 2.7 and Python 3.4 are officially maintained implementations. Although upward compatibility has been maintained for most of the history of the language, the 3.0 version was an exception: it is a more elegant and cleaner language that finally removed support for a number of misfeatures from the language's early days, but is fundamentally the same language.

If you are using 2.x releases of Python, there is no hurry to convert to the 3.x series. Release 2.7 is guaranteed to be around for many years. Furthermore, there are tools to help you automate much of the conversion process. Notes throughout this document will discuss specific features of 2.7 that are intended to ease the transition.

For full documentation of the current Python 3.x version, see the online documentation.