New submission from Andy Buckley <a...@insectnation.org>: optparse's OptionParser takes a usage string as a constructor argument, in which a "%prog" token is replaced with the executable name. Nice idea, but the choice of a percent sign for token delimiter is troublesome since it means that attempting to substitute any variables into the usage string, e.g.
usage = """ %prog [options] foo bar ... Some computed info: %s""" % myinfo gives a ValueError: ValueError: unsupported format character 'p' (0x70) at index 2 Maybe this ceases to be a problem with what I've heard about the formatting re-design in Python 3.x, but it will probably continue to be awkward for the 2.x series where the "%" operator still applies. Maybe optparse could also use a safer token ("@prog", say), so that those of use who would like to substitute variables into usage strings don't have to artificially break our strings apart every time we use the program name? ---------- components: Library (Lib) messages: 82755 nosy: andybuckley severity: normal status: open title: optparse special usage tokens conflict with formatting characters type: behavior versions: Python 2.5 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue5374> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com