如何在scrapy中将参数传递给pipelines.py？

MY_PARAM = 'my_value'

from scrapy.utils.project import get_project_settings

class MyPipeline(object):
    def __init__(self):
        settings = get_project_settings()
        self.my_param = settings.get('MY_PARAM')

    def process_item(self, item, spider):
        # 使用self.my_param进行处理
        return item