from django.core.management.base import BaseCommand

class Command(BaseCommand):

    def add_arguments(self, parser):

        group = parser.add_mutually_exclusive_group(required=True)

        group.add_argument("--for", dest="until", action="store")

        group.add_argument("--until", action="store")

    def handle(self, *args, **options):

        for option, value in options.items():

            if value is not None:

                self.stdout.write("%s=%s" % (option, value))