Scrapy 是一套基于基于Twisted的异步处理框架，纯python实现的爬虫框架，用户只需要定制开发几个模块就可以轻松的实现一个爬虫，用来抓取网页内容以及各种图片，非常之方便～
示例代码：
$pip install scrapy
$cat > myspider.py <<EOF
import scrapy
class BlogSpider(scrapy.Spider):
name = 'blogspider'
start_urls = ['https://blog.scrapinghub.com']
def parse(self, response):
for title in response.css('h2.entry-title'):
yield {'title': title.css('a ::text').extract_first()}
next_page = response.css('div.prev-post > a ::attr(href)').extract_first()
if next_page:
yield scrapy.Request(response.urljoin(next_page), callback=self.parse)
EOF
$scrapy runspider myspider.py
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