1、安裝lxml時報錯 
$sudo pip install lxml

錯誤資訊如下:

Compile failed: command ‘gcc’ failed with exit status 1 
/tmp/easy_install-lk8jAw/lxml-3.6.1/temp/xmlXPathInit2tf2ts.c:1:26: 錯誤：libxml/xpath.h：沒有那個檔案或目錄

Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?

error: Setup script exited with error: command ‘gcc’ failed with exit status 1

2、安裝libxml2 
$sudo yum install libxml2

3、重新安裝lxml 
$sudo pip install lxml 
還是提示相同的錯誤資訊。

4、檢查是否安裝 libxml2-dev、 libxslt-dev
$sudo apt-get install libxslt-dev

會同時安裝依賴 libxml2-dev

5、再次安裝lxml 
$sudo pip install lxml 
安裝成功。

$ sudo pip install lxml 
Collecting lxml 
Using cached lxml-3.6.1.tar.gz 
Installing collected packages: lxml 
Running setup.py install for lxml … done 
Successfully installed lxml-3.6.1