On Wed, Sep 26, 2018 at 7:29 AM <j...@math.brown.edu> wrote: > > I recently found out about Python 3's round-to-even change (via > https://github.com/cosmologicon/pywat!) and am having trouble finding > where that change was discussed.
That GitHub project is hilarious especially the NaN stuff... Rounding is from engineering so there is more than one definition, and one is not more correct than the others, it just depends on the specific application. Functions like ceiling and floor do have mathematical definitions. Whichever definition of rounding the Python standard library adopts, it should be very explicitly defined in the documentation in terms of ceiling and floor. In applications where rounding is actually important, it's a good idea to do calculations with one rounding function, and again with another, and compare results. _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
