当我使用 pip 安装数据包时（例如 patsy）
[sudo] pip install patsy
Downloading/unpacking patsy
Downloading patsy-0.1.0.tar.gz (258kB): 258kB downloaded
Running setup.py egg_info for package patsy
no previously-included directories found matching 'doc/_build'
Requirement already up-to-date: numpy in /usr/lib/python2.7/dist-packages (from patsy)
Installing collected packages: patsy
Running setup.py install for patsy
no previously-included directories found matching 'doc/_build'
Successfully installed patsy
Cleaning up...
并且 pip 安装在 /usr/local/lib/python2.7/dist-packet/ 而不是 /usr/lib/python2.7/dist-packet/ 中，当我尝试在 Ipython 中导入数据包时出现此错误：
import patsy
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-1-9de22d189b17> in <module>()
----> 1 import patsy
ImportError: No module named patsy
我有 Linux Mint Mate 15。我做错了什么？