def generate_added_fields(self):
        """
        Fields that have been added
        """
        for app_label, model_name, field_name in sorted(self.old_field_keys - self.new_field_keys):
            self._generate_added_field(app_label, model_name, field_name)
dataset/ETHPy150Open django/django/django/db/migrations/autodetector.py/MigrationAutodetector.generate_added_fields/swapped operands of `-`