當沒安裝lxml的時候，終端中運行python文件會報錯：
Traceback (most recent call last):
File "web_parse.py", line 4, in <module>
Soup = BeautifulSoup(wb_data,'lxml')
File "/Library/Python/2.7/site-packages/bs4/__init__.py", line 152, in __init__
% ",".join(features))
bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?
打開終端
cd到相關的文件夾，
sudo easy_install lxml
Searching for lxml
Best match: lxml 3.8.0
Processing lxml-3.8.0-py2.7-macosx-10.11-intel.egg
lxml 3.8.0 is already the active version in easy-install.pth
Using /Library/Python/2.7/site-packages/lxml-3.8.0-py2.7-macosx-10.11-intel.egg
Processing dependencies for lxml
Finished processing dependencies for lxml
然後這就表示安裝完成了；
還可以在終端安裝beautifulsoup
同樣在相關文件夾中
sudo easy_install beautifulsoup4
Searching for beautifulsoup4
Best match: beautifulsoup4 4.3.2
beautifulsoup4 4.3.2 is already the active version in easy-install.pth
Using /Library/Python/2.7/site-packages
Processing dependencies for beautifulsoup4
Finished processing dependencies for beautifulsoup4
這就表示安裝完成了；