human
Solve the following python programming problem given the following code:
@ pytest.fixture 
def django_testdir_initial(django_testdir) : 
    'A django_testdir fixture which provides initial_data.' 
    django_testdir.makefile ('.json', initial_data = '
        [{
            "pk": 1,
            "model": "app.item",
            "fields": { "name": "mark_initial_data" }
        }]') 
    def _create_initial_south_migration() : 
        '
        Create initial South migration for pytest_django_test/app/models.py.
        ' 
        django_testdir.mkpydir ('tpkg/app/south_migrations') 
        django_testdir.create_app_file ('
            from south.v2 import SchemaMigration
            from south.db import db

            class Migration(SchemaMigration):
                def forwards(self, orm):
                    db.create_table(u\'app_item\', (
                        (u\'id\', self.gf(\'django.db.models.fields.AutoField\')(primary_key=True)),
                        (\'name\', self.gf(\'django.db.models.fields.CharField\')(max_length=100)),
                   ))
                    db.send_create_signal(u\'app\', [\'Item\'])
                    print("mark_south_migration_forwards"),

                def backwards(self, orm):
                    db.delete_table(u\'app_item\')

                models = {
                    u\'app.item\': {
                        \'Meta\': {\'object_name\': \'Item\'},
                        u\'id\': (\'django.db.models.fields.AutoField\', [], {\'primary_key\': \'True\'}),
                        \'name\': (\'django.db.models.fields.CharField\', [], {\'max_length\': \'100\'})
                    }
                }

                complete_apps = [\'app\']
            ', 'south_migrations/0001_initial.py') 
django_testdir.create_initial_south_migration = <MASK> 
    return django_testdir 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def _create_initial_south_migration(