def deregister_app_verbose_name(self, app_label):
        """
        Deregisters the given app label. Remove the app label from the
        self.app_verbose_names as well.

        If the app label is not already registered, this will raise
        ImproperlyConfigured.
        """
        try:
            del self.app_verbose_names[app_label]
        except __HOLE__:
            raise ImproperlyConfigured(
                '%s app label was never registered in django-admin2' % app_label)
dataset/ETHPy150Open pydanny/django-admin2/djadmin2/core.py/Admin2.deregister_app_verbose_name