点安装无法安装到正确的目录？

Question

我似乎无法正确使用sudo pip install来将其安装到以下目录中：

/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/

这样我就可以使用python导入模块

我跑了

sudo pip install scikit-learn --upgrade

结果

Requirement already up-to-date: scikit-learn in /usr/local/lib/python2.7/site-packages
Cleaning up...

但是，它不在正确的目录中

如何获得sudo pip install安装到正确的目录？

另外，我尝试了

sudo pip安装Scrappy

我收到以下消息

new-host-2:site-packages Chris$ sudo pip install Scrapy
Password:
Requirement already satisfied (use --upgrade to upgrade): Scrapy in /usr/local/lib/python2.7/site-packages
Requirement already satisfied (use --upgrade to upgrade): Twisted>=10.0.0 in /usr/local/lib/python2.7/site-packages (from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): w3lib>=1.8.0 in /usr/local/lib/python2.7/site-packages (from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): queuelib in /usr/local/lib/python2.7/site-packages (from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): lxml in /usr/local/lib/python2.7/site-packages (from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): pyOpenSSL in /usr/local/lib/python2.7/site-packages (from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): cssselect>=0.9 in /usr/local/lib/python2.7/site-packages (from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): six>=1.5.2 in /usr/local/lib/python2.7/site-packages (from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): zope.interface>=3.6.0 in /usr/local/lib/python2.7/site-packages (from Twisted>=10.0.0->Scrapy)
Requirement already satisfied (use --upgrade to upgrade): cryptography>=0.2.1 in /usr/local/lib/python2.7/site-packages (from pyOpenSSL->Scrapy)
Requirement already satisfied (use --upgrade to upgrade): setuptools in /usr/local/lib/python2.7/site-packages (from zope.interface>=3.6.0->Twisted>=10.0.0->Scrapy)
Requirement already satisfied (use --upgrade to upgrade): cffi>=0.8 in /usr/local/lib/python2.7/site-packages (from cryptography>=0.2.1->pyOpenSSL->Scrapy)
Requirement already satisfied (use --upgrade to upgrade): pycparser in /usr/local/lib/python2.7/site-packages (from cffi>=0.8->cryptography>=0.2.1->pyOpenSSL->Scrapy)

这两个实例均表明已安装但未正确安装。例如，当我在python中运行以下导入时：

import scrapy
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-6-51c73a18167b> in <module>()
----> 1 import scrapy

ImportError: No module named scrapy

我尝试了以下方法：

sudo ln -s /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/

Answer 1

从注释到原始问题，似乎您安装了多个版本的python，而pip只是使用了错误的版本。

首先，要知道您使用的是哪个版本的python，只需输入即可which python。您应该看到：

which python
/Library/Frameworks/Python.framework/Versions/2.7/bin/python

如果您要使用正确的python版本，或者：

which python
/usr/bin/python

如果您要使用“错误”版本。为了使pip转到正确的版本，您首先必须更改路径：

 export PATH=/Library/Frameworks/Python.framework/Versions/2.7/bin/python:${PATH}

现在输入“哪个python”将使您获得正确的结果。接下来，安装pip（如果尚未安装此python，则安装pip）。最后，使用它。您现在应该很好。