On Thu, 07 Apr 2005 15:40:24 -0400, Steve Holden <[EMAIL PROTECTED]> wrote:
>Leo Breebaart wrote: >> I've recently become rather fond of using Exceptions in Python to >> signal special conditions that aren't errors, but which I feel >> are better communicated up the call stack via the exception >> mechanism than via e.g. return values. >> >Absolutely. > >> For instance, I'm thinking of methods such as: >> >> >> def run(self): >> """ Feed the input file to the simulator. """ >> >> for linenr, line in enumerate(self.infile): >> try: >> current_values = self.parse_line(linenr, line) >> ==> except CommentLineException: >> continue >> results = self.do_one_simulation_step(current_values) >> self.process_simulation_results(results) >> >> >> which I use in order to discard comments from a file I'm parsing >> line-by-line. It also possible for exception arguments to deliver a result, rather than indicate something rejected. E.g., you can terminate a recursive search via an exception. If no exception occurs, you have gone through the entire search space and not met the solution criterion. Regards, Bengt Richter -- http://mail.python.org/mailman/listinfo/python-list
