On 4 Jan, 10:45 pm, [EMAIL PROTECTED] wrote: >[GvR to Tim] >>Do you have an opinion as to whether we should >>adopt round-to-even at all (as a default)? > >For the sake of other implementations (Jython, etc) and for ease of >reproducing the results with other tools (Excel, etc), the simplest >choice is int(x+0.5). That works everywhere, it is easy to explain, it >runs fast, and it is not hard to get right.
I agree for the default. Except the part where Excel, Jython, and Python's current round, actually use sign(x) * int(abs(x)+0.5), so maybe it's not *completely* easy to get right ;-). Having other rounding methods *available*, though, would be neat. The only application I've ever worked on where I cared about the difference, the user had to select it (since accounting requirements differ by jurisdiction and, apparently, by bank preference). Having a standard way to express this (especially if it worked across different numeric types, but perhaps I digress) would be pleasant. Implementing stochastic rounding and banker's rounding oneself, while not exactly hard, is a drag. _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
