Fixed #25239 -- Corrected makemigrations numbering if a migration has a number-only filename.

        Given a migration name, tries to extract a number from the

        beginning of it. If no number found, returns None.

        """

        if re.match(r"^\d+_", name):

            return int(name.split("_")[0])

        match = re.match(r'^\d+', name)

        if match:

            return int(match.group())

        return None

                    self.assertIn('\\xda\\xd1\\xcd\\xa2\\xd3\\xd0\\xc9', content)  # title.verbose_name

                    self.assertIn('\\u201c\\xd0j\\xe1\\xf1g\\xf3\\u201d', content)  # title.default

    def test_makemigrations_order(self):

        """

        makemigrations should recognize number-only migrations (0001.py).

        """

        module = 'migrations.test_migrations_order'

        with self.temporary_migration_module(module=module) as migration_dir:

            if hasattr(importlib, 'invalidate_caches'):

                # Python 3 importlib caches os.listdir() on some platforms like

                # Mac OS X (#23850).

                importlib.invalidate_caches()

            call_command('makemigrations', 'migrations', '--empty', '-n', 'a', '-v', '0')

            self.assertTrue(os.path.exists(os.path.join(migration_dir, '0002_a.py')))

    def test_failing_migration(self):

        # If a migration fails to serialize, it shouldn't generate an empty file. #21280

        apps.register_model('migrations', UnserializableModel)

# -*- coding: utf-8 -*-

from __future__ import unicode_literals

from django.db import migrations

class Migration(migrations.Migration):

    initial = True

    operations = [

    ]