[Cameron] > try: > getattr(commands, VARIABLE)() > except NameError: > print >> sys.stderr, "Unknown command", VARIABLE > > this situation illustrates the discomfort I consistently > feel: how do I know that the NameError means VARIABLE didn't resolve, > rather than that it did, but that evaluation of commands.VARIABLE() > itself didn't throw a NameError? My usual answer: umm, unless I go > to efforts to prevent it, I *don't* know that didn't happen.
The 'try' block should only include the code that you expect to fail with the given exception. Try this instead: >>> try: >>> command = getattr(commands, VARIABLE) >>> except AttributeError: >>> print >> sys.stderr, "Unknown command", VARIABLE >>> else: >>> command() (Aside: I think AttributeError is correct here, not NameError.) -- Richie Hindle [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
