Pip安装未安装到正确的目录？

Question

我似乎不能正确使用sudo pip安装，以便它安装到以下目录：

/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

我跑过了

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

如何让sudo pip安装到正确的目录？

另外，我也试过了

sudo-pip安装刮擦

我得到以下信息

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)

这两个实例都表明它已经安装，但并不正确。例如，当我在python中运行以下导入：

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

Virtualenv是你的朋友

即使您想将包添加到主安装中，最好还是先在虚拟环境中进行，以确保与其他包的兼容性。然而，如果你熟悉了虚拟环境，你可能会发现没有理由在你的基本安装中安装任何东西。

Answer 2

这就是我在Windows上的工作原理。原因是多个python安装

1. 使用正确的python更新路径

Answer 3

从评论到最初的问题，似乎你安装了多个版本的python，而pip只是去了错误的版本。

首先，要知道您使用的是哪个版本的python，只需键入whichpython。您应该看到：

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

如果你要使用正确的python版本，或者：

which python
/usr/bin/python

如果你选择了“错误”的版本。要使pip转到正确的版本，首先必须更改路径：

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

键入哪个python现在会得到正确的结果。接下来，安装pip（如果尚未安装python）。最后，使用它。你现在应该没事了。