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The FAQ item you are quoting is indeed obsolete, and should be updated, since both SciPy and Cython now support Python 3.

Efforts towards support for Python 3 are under way and tracked at Sage trac ticket #15530 as indicated by @kcrisman.

The topic comes up with some frequency on the sage-devel mailing list and the conclusion of a 2016-05 sage-devel discussion was that we should aim to support both Python 2 and Python 3 for a while.

In a 2016-10 sage-devel discussion it was pointed out that switching to Python 3 would improve Sage's startup time, and Frédéric Chapoton called for more volunteers to work on the transition to Python 3.