源码中这个场景,用 staticmethod 有很大的必要性吗?

基类:

class Schema(object):

......

    def filter(self, obj):
        filtered = {}
        for key, value in six.iteritems(obj):
            if self._filter_func(self.properties, key):
                filtered[key] = value

......

    @staticmethod
    def _filter_func(properties, key):
        return key in properties

其中一个重写了该方法的子类:

class PermissiveSchema(Schema):
    @staticmethod
    def _filter_func(properties, key):
        return True

感觉上完全不需要改成 staticmethod
反正最终还是需要传类的属性进去