摘要：
## letter.py ```python import scrapy from scrapy.linkextractors import LinkExtractor from scrapy.spiders import CrawlSpider, Rule from letterBeijing.i 阅读全文
摘要：
## 1. Spider 核心思想是在parse方法中，返回新的Requests请求，代码如下 ```python import scrapy from hello_world.items import HelloWorldItem class MirSpider(scrapy.Spider): n 阅读全文