requests库官方文档中文版:
http://cn.python-requests.org/zh_CN/latest/index.html
BeautifulSoup库官方文档中文版:
http://beautifulsoup.readthedocs.io/zh_CN/latest/
PEP8——Python代码规范:
https://www.python.org/dev/peps/pep-0008/
爬虫笔记:
https://zhuanlan.zhihu.com/p/24358829
Python基础教程:
http://www.runoob.com/python/python-tutorial.html