On Feb 15, 2007, at 2:59 PM, Raymond Hettinger wrote:
- Enhance doctest with a method that computes updated doctest
results. If the only change I make to a matrix suite is to add commas to long numbers in the matrix repr(), then it would be nice to have an automated way to update the matrix output on all the other test cases in the module.
A while back I wrote up a command-line doctest driver that does this and more . The output of "doctest_driver.py --help" is below; note in particular the --update and --debug options. I also wrote an emacs mode  that has support for running doctest & putting the output (^c^c) or diffs (^c^d) in an output buffer; and for updating the output of selected examples (^c^r). I never really got around to doing official releases for either (although doctest-mode.el is part of the python-mode.el package).
I could move some of this code into the doctest mode, if it seems appropriate; or I could just go ahead and release the driver and publicize it.
 http://nltk.svn.sourceforge.net/viewvc/nltk/trunk/nltk/nltk_lite/ test/doctest_driver.py?view=markup
 http://python-mode.svn.sourceforge.net/viewvc/*checkout*/python- mode/trunk/python-mode/doctest-mode.el?revision=424