Differences between distribute, distutils, setuptools and distutils2?

The Situation

I’m trying to port an open-source library to Python 3. (SymPy, if anyone is wondering.)

So, I need to run 2to3 automatically when building for Python 3. To do that, I need to use distribute. Therefore, I need to port the current system, which (according to the doctest) is distutils.


The Problem

Unfortunately, I’m not sure what’s the difference between these modules—distutils, distribute, setuptools. The documentation is sketchy as best, as they all seem to be a fork of one another, intended to be compatible in most circumstances (but actually, not all)…and so on, and so forth.


The Question

Could someone explain the differences? What am I supposed to use? What is the most modern solution? (As an aside, I’d also appreciate some guide on porting to Distribute, but that’s a tad beyond the scope of the question…)

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