git: 9front

ref: cc978d6fdb7e8ceddc92a7ed3f0f393f39c915e7
dir: /sys/src/cmd/python/Doc/lib/required_1.py/

View raw version 
import optparse

class OptionParser (optparse.OptionParser):

    def check_required (self, opt):
        option = self.get_option(opt)

        # Assumes the option's 'default' is set to None!
        if getattr(self.values, option.dest) is None:
            self.error("%s option not supplied" % option)


parser = OptionParser()
parser.add_option("-v", action="count", dest="verbose")
parser.add_option("-f", "--file", default=None)
(options, args) = parser.parse_args()

print "verbose:", options.verbose
print "file:", options.file
parser.check_required("-f")