from django.contrib.admin.helpers import ACTION_CHECKBOX_NAME

from django.contrib.admin.options import ModelAdmin, HORIZONTAL, VERTICAL

from django.contrib.admin.options import StackedInline, TabularInline

from django.contrib.admin.sites import AdminSite, site

def autodiscover():

    """

    Auto-discover INSTALLED_APPS admin.py modules and fail silently when

    not present. This forces an import on them to register any admin bits they

    may want.

    """

    import copy

    from django.conf import settings

    from django.utils.importlib import import_module

    from django.utils.module_loading import module_has_submodule

    for app in settings.INSTALLED_APPS:

        mod = import_module(app)

        # Attempt to import the app's admin module.

        try:

            before_import_registry = copy.copy(site._registry)

            import_module('%s.admin' % app)

        except:

            # Reset the model registry to the state before the last import as

            # this import will have to reoccur on the next request and this

            # could raise NotRegistered and AlreadyRegistered exceptions

            # (see #8245).

            site._registry = before_import_registry

            # Decide whether to bubble up this error. If the app just

            # doesn't have an admin module, we can ignore the error

            # attempting to import it, otherwise we want it to bubble up.

            if module_has_submodule(mod, 'admin'):

                raise