以安装Beautifulsoup4为例:

1.到网站上下载:http://www.crummy.com/software/BeautifulSoup/bs4/download/

2.解压文件到C:\Python27

3.cmd运行C:\Python27\BeautifulSoup>Python setup.py install

4.注意库名:creating build\lib\bs4

5.测试一下是否能导入:

>>> import bs4

如果不能导入,会提示:ImportError: No module named bs4