Handle Apps with South migrations as unmigrated apps.

                    if import_name[0] not in "_.~":

                        migration_names.add(import_name)

            # Load them

            south_style_migrations = False

            for migration_name in migration_names:

                try:

                    migration_module = import_module("%s.%s" % (module_name, migration_name))

                except ImportError as e:

                    # Ignore South import errors, as we're triggering them

                    if "south" in str(e).lower():

                        continue

                        south_style_migrations = True

                        break

                    raise

                if not hasattr(migration_module, "Migration"):

                    raise BadMigrationError("Migration %s in app %s has no Migration class" % (migration_name, app_label))

                # Ignore South-style migrations

                if hasattr(migration_module.Migration, "forwards"):

                    continue

                    south_style_migrations = True

                    break

                self.disk_migrations[app_label, migration_name] = migration_module.Migration(migration_name, app_label)

            if south_style_migrations:

                self.unmigrated_apps.add(app_label)

    def get_migration_by_prefix(self, app_label, name_prefix):

        "Returns the migration(s) which match the given app label and name _prefix_"