Alexander Belopolsky <belopolsky@users.sourceforge.net> added the comment: I had some success after running 2to3 on Doc/conf.py and Doc/tools. The build succeeded, but I have not compared the output yet. Running doctest, however, still reported lots of errors and hang in turtle.rst. $ sphinx-build -b doctest -d Doc/build3/doctrees -D latex_paper_size= Doc Doc/build3/html ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue10224> _______________________________________