On Sat, Jan 28, 2012 at 1:20 AM, Steven D'Aprano <st...@pearwood.info> wrote: > And finally, we come all the way back to the beginning again and say That's > not the right way to do it! Don't round the number *outside* of the string > formatting, get the string formatting to do it for you:
Reason being because repr(round(0.1, 2)) != '0.1' (on older Pythons). String formatting does the right thing. Also don't use floats for currency, they can attract rounding errors and can't represent many common amounts with 100% precision, the way a Decimal or Fraction can (see decimal, fractions modules). For example, it can't represent 0.1 exactly, thus leading to the above situation. -- Devin _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
