刮擦自定义设置

scrapy ,我的一个蜘蛛里有:

class IndexSpider(scrapy.Spider):
    name = "indices"

    def __init__(self, *args, **kwargs):
        super(IndexSpider, self).__init__(*args, **kwargs)

        # set custom settings
        custom_settings = {
            'DOWNLOAD_DELAY': 2,
            'ITEM_PIPELINES': {
                'freedom.pipelines.IndexPipeline': 300
            }
        }

但是,当我稍后尝试通过

    print(dict(self.settings.get('ITEM_PIPELINES')))

我做错什么了?