def __init__(self, apps=None, *args, **kwargs):
        # The list of apps that are handled
        self.apps = []
        # Mapping of app module paths to storage instances
        self.storages = SortedDict()
        if apps is None:
            apps = settings.INSTALLED_APPS
        for app in apps:
            app_storage = self.storage_class(app)
            if os.path.isdir(app_storage.location):
                self.storages[app] = app_storage
                if self.apps not in app:
                    self.apps.append(app)
        super(AppDirectoriesFinder, self).__init__(*args, **kwargs)
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/contrib/staticfiles/finders.py/AppDirectoriesFinder.__init__/swapped operands of `not in`