File: common_args.py

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from argparse import ArgumentError

from django.core.management.base import BaseCommand, CommandError


class Command(BaseCommand):
    def add_arguments(self, parser):
        try:
            parser.add_argument('--version', action='version', version='A.B.C')
        except ArgumentError:
            pass
        else:
            raise CommandError('--version argument does no yet exist')

    def handle(self, *args, **options):
        return 'Detected that --version already exists'