In article <pan.2010.01.04.03.30...@remove.this.cybersource.com.au>, Steven D'Aprano <ste...@remove.this.cybersource.com.au> wrote:
> This last one can be *very* problematic. In the early 1990s, I was > programming using a callback API that could only return an integer. The > standard way of indicating an error was to return -1. But what happens if > -1 is a legitimate return value, e.g. for a maths function? One of the truly nice features of Python is the universally distinguished value, None. -- http://mail.python.org/mailman/listinfo/python-list
