FYI: docutils will require some modification of at least the io module, to the extent that the ideal mode of fixing the current sources so that a subsequent pass of 2to3 will do the job, is probably not possible (but may be outside of this one file). I've made a report to the docutils tracker to that effect; will see what dialog ensues. There are things to handle images etc. so I think fixing this is above my paygrade.
<br><br>pygments converts ok but uses cPickle; changing to pickle is easy. Since pygments uses <a href="http://docutils.io">docutils.io</a>, it isn't possible to run it further.<br><br>sphinx converts ok, and can be imported.