在ternimal输入：
curl http://www.crummy.com/software/BeautifulSoup/bs4/download/4.1/beautifulsoup4-4.1.2.tar.gz >> beautifulsoup4-4.1.2.tar.gz
tar zxvf beautifulsoup4-4.1.2.tar.gz
python setup.py install
python下分析网页的好工具：BeautifulSoup
原文：http://www.cnblogs.com/terryc/p/5063564.html
