>>>fromorchestra.contrib.settingsimportSetting,parser>>>Setting.settings['TASKS_BACKEND'].value'thread'>>>Setting.settings['TASKS_BACKEND'].default'thread'>>>Setting.settings['TASKS_BACKEND'].validate_value('rata')Traceback(mostrecentcalllast):File"<console>",line1,in<module>File"/home/orchestra/django-orchestra/orchestra/contrib/settings/__init__.py",line99,invalidate_valueraiseValidationError("'%s' not in '%s'"%(value,', '.join(choices)))django.core.exceptions.ValidationError:["'rata' not in 'thread, process, celery'"]>>>parser.apply({'TASKS_BACKEND':'process'})...>>>parser.apply({'TASKS_BACKEND':parser.Remove()})...