在Python Extension Packages for Windows 上找到相应的库，解压后把bs4目录复制到Python安装目录下的lib目录下。 参考：Python爬虫利器二之Beautiful Soup的用法觅
#coding:utf-8
from bs4 import BeautifulSoup
html = ...
soup = BeautifulSoup(html,"lxml")
print soup.title
要指定解释器，否则会报错：
<title>The Dormouse's story</title>
D:\Python27\lib\bs4\__init__.py:166: UserWarning: No parser was explicitly specified, so I'm using the best available HTML parser for this system ("lxml"). This usually isn't a problem, but if you run this code on another system, or in a different virtual environment, it may use a different parser and behave differently.
To get rid of this warning, change this:
BeautifulSoup([your markup])
to this:
BeautifulSoup([your markup], "lxml")
markup_type=markup_type))
Process finished with exit code 0
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