参考资料

• BeautifulSoup

https://www.crummy.com/software/BeautifulSoup/bs4/doc/

• 正则表达式

http://www.regexlab.com/zh/regref.html

• Scrapy

https://scrapy.org/

• Xpath教程

http://www.w3school.com.cn/xpath/

• Scrapy命令行

https://doc.scrapy.org/en/latest/topics/commands.html