为什么在使用pip和/或easy_install安装后，我无法使用python 2.7在mac上导入beautifulsoup？

Question

$ sudo pip install beautifulsoup4 
Requirement already satisfied (use --upgrade to upgrade): beautifulsoup4 in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages 
Cleaning up... 

我安装beautifulsoup4，它似乎成功完成，但我不能导入它：

Python 2.7.3 (v2.7.3:70, Apr 9 2012, 20:52:43) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin 
Type "help", "copyright", "credits" or "license" for more information. 
>>> import beautifulsoup4 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
ImportError: No module named beautifulsoup4 
>>> import beautifulsoup 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
ImportError: No module named beautifulsoup 

Answer 1

该模块被称为bs4：

from bs4 import BeautifulSoup