Removed support for AppCommand.handle_app() per deprecation timeline.

        Perform the command's actions for app_config, an AppConfig instance

        corresponding to an application label given on the command line.

        """

        try:

            # During the deprecation path, keep delegating to handle_app if

            # handle_app_config isn't implemented in a subclass.

            handle_app = self.handle_app

        except AttributeError:

            # Keep only this exception when the deprecation completes.

        raise NotImplementedError(

            "Subclasses of AppCommand must provide"

            "a handle_app_config() method.")

        else:

            warnings.warn(

                "AppCommand.handle_app() is superseded by "

                "AppCommand.handle_app_config().",

                RemovedInDjango19Warning, stacklevel=2)

            if app_config.models_module is None:

                raise CommandError(

                    "AppCommand cannot handle app '%s' in legacy mode "

                    "because it doesn't have a models module."

                    % app_config.label)

            return handle_app(app_config.models_module, **options)

class LabelCommand(BaseCommand):

    :class:`~django.apps.AppConfig` instance corresponding to an application

    label given on the command line.

.. versionchanged:: 1.7

    Previously, :class:`AppCommand` subclasses had to implement

    ``handle_app(app, **options)`` where ``app`` was a models module. The new

    API makes it possible to handle applications without a models module. The

    fastest way to migrate is as follows::

        def handle_app_config(app_config, **options):

            if app_config.models_module is None:

                return                                  # Or raise an exception.

            app = app_config.models_module

            # Copy the implementation of handle_app(app_config, **options) here.

    However, you may be able to simplify the implementation by using directly

    the attributes of ``app_config``.

.. class:: LabelCommand

A management command which takes one or more arbitrary arguments