小编Gem*_*mmu的帖子

我有使用@property装饰器设置属性的类.它们使用try和except子句作为getter和setter.如果未设置attribute,它将从数据库获取数据并使用它来从其他类中实例化对象.我试图保持示例简短,但用于实例化属性对象的代码与每个属性略有不同.他们的共同点是尝试 - 开头时除外.

class SubClass(TopClass):

    @property
    def thing(self):
        try:
            return self._thing
        except AttributeError:
            # We don't have any thing yet
            pass
        thing = get_some_thing_from_db('thing')
        if not thing:
            raise AttributeError()
        self._thing = TheThing(thing)
        return self._thing

    @property
    def another_thing(self):
        try:
            return self._another_thing
        except AttributeError:
            # We don't have things like this yet
            pass
        another_thing = get_some_thing_from_db('another') 
        if not another_thing:
            raise AttributeError()
        self._another_thing = AnotherThing(another_thing)
        return self._another_thing

    ...etc...

    @property
    def one_more_thing(self):
        try:
            return self._one_more_thing
        except AttributeError:
            # We don't have this …