安装lxml HTML 解析器，需要c语言库? BeautifulSoup

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lxml安装

soup = BeautifulSoup(str1, 'lxml')

有时提示：bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

原因是没有安装 lxml，但需要C语言库

Python中lxml模块的安装_Linux教程_Linux公社-Linux系统门户网站

http://pypi.python.org/pypi/lxml/2.3/
easy_install lxml-2.3-py2.7-win-amd64.egg

【Linux系统】

第一步: 安装 libxml2
$ sudo apt-get install libxml2 libxml2-dev
第二步: 安装 libxslt
$ sudo apt-get install libxlst libxslt-dev
第三步: 安装 python-libxml2 和 python-libxslt
$ sudo apt-get install python-libxml2 python-libxslt
第四步: 安装 lxml
$ sudo easy_install lxml

Window本地安装

安装lxml HTML 解析器，需要c语言库? - Python 入门 - 知乎

http://link.zhihu.com/?target=http%3A//www.lfd.uci.edu/%7Egohlke/pythonlibs/%23lxml
pip install lxml‑3.4.4‑cp27‑none‑win_amd64.whl# (Python2.7, 64bit)

BeautifulSoup解析器有4种：

“html.parser”

“lxml”

“xml”

“html5lib”

部署：写入 Requirement.txt，让 Heroku自动安装

$ pip install -r requirements.txt
Collecting lxml==3.6.4 (from -r requirements.txt (line 37))
Downloading lxml-3.6.4-cp27-cp27m-manylinux1_x86_64.whl (4.2MB)
Installing collected packages: lxml

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