This development issues tracker is for issues that might result in
changes in future Python releases.  This issue was properly closed and
in the absence of a new proposal for future change, should have stayed
closed, even with the addition of a comment.

The only-half removal of the cmp family in 3.0 was an error.  For better
or for worse, and after much discussion, the developers decided to fix
the error immediately in 3.0.1 in order to prevent more error-dependent
portings that would need further fix in 3.1.  In other words, better a
little pain now than more pain in the future.

What you do with your installation is up to you.  If adding a line works
for you as a temporary measure, great.  Or help the SWIG folks to finish
the port to Python 3 as intended and as it is in 3.0.1 and will be in
the future.

Further current-release usage questions should be directed to the
python-list (or c.l.p or the gmane mirror) or other forums.

PS. Your original post would have been more readable with the long error
log severely snipped to just show the essential point.