Alexander Belopolsky <belopolsky@users.sourceforge.net> added the comment: I started porting the patch to 3.x and it looks like I've uncovered another bug in sphinx: $ sphinx-build -b doctest -d build/doctrees . build/doctest library/traceback.rst .. ********************************************************************** File "library/traceback.rst", line 327, in default .. Differences (ndiff with -expected +actual): *** print_tb: - File "<doctest...>", line 10, in <module> ? ^^^ + File "<doctest default[0]>", line 10, in <module> ? ^^^^^^^^^^^ lumberjack() (I added +REPORT_NDIFF to testoutput options for clarity.) I even tried adding +ELLIPSIS to options, but this did not help. The same example works in 2.7. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue10225> _______________________________________