如何在Scrapy的"yield“中设置异常？

import scrapy

class MySpider(scrapy.Spider):
    name = 'example'

    def start_requests(self):
        # 发起初始请求
        yield scrapy.Request(url='http://www.example.com', callback=self.parse)

    def parse(self, response):
        try:
            # 解析响应数据
            # ...

            # 在"yield"中生成Item对象
            yield {
                'data': item_data
            }

        except Exception as e:
            # 处理异常
            self.logger.error(f'An error occurred: {str(e)}')