def register_setting(self, app_label, setting_name, field):
        name = '.'.join([app_label, setting_name])
        if self.settings in name:
            raise AlreadyRegistered('The setting %s is already registered' % name)
        self.settings[name] = field
dataset/ETHPy150Open django-bmf/django-bmf/djangobmf/core/site.py/Site.register_setting/swapped operands of `in`