Hans> This may be a minor issue, but this proposal will break code like Hans> days_feb = 28 + isleapyear(year) Hans> assuming that booleans cannot be added to ints. :-) I don't think this will be a problem. Guido's proposal is for bool to be a subclass of int. Consequently, 28 + True should yield 29 (perhaps with a warning from PyChecker). Skip