无法使用 brew 安装 python答案

【问题标题】：cannot install python using brew无法使用 brew 安装 python
【发布时间】：2016-10-12 19:32:01
【问题描述】：

尝试使用以下命令安装python：

brew install python

但不幸的是，我收到以下错误：

>brew install python
==> Downloading https://homebrew.bintray.com/bottles/python-2.7.12_2.el_capitan.
Already downloaded: /Users/maguerra/Library/Caches/Homebrew/python-2.7.12_2.el_capitan.bottle.tar.gz
==> Pouring python-2.7.12_2.el_capitan.bottle.tar.gz
==> Using the sandbox
==> /usr/local/Cellar/python/2.7.12_2/bin/python -s setup.py --no-user-cfg insta
Last 15 lines from /Users/maguerra/Library/Logs/Homebrew/python/post_install.01.python:
copying setuptools/command/rotate.py -> build/lib/setuptools/command
copying setuptools/command/saveopts.py -> build/lib/setuptools/command
copying setuptools/command/sdist.py -> build/lib/setuptools/command
copying setuptools/command/setopt.py -> build/lib/setuptools/command
copying setuptools/command/test.py -> build/lib/setuptools/command
copying setuptools/command/upload.py -> build/lib/setuptools/command
copying setuptools/command/upload_docs.py -> build/lib/setuptools/command
creating build/lib/setuptools/extern
copying setuptools/extern/__init__.py -> build/lib/setuptools/extern
copying setuptools/script (dev).tmpl -> build/lib/setuptools
copying setuptools/script.tmpl -> build/lib/setuptools
running install_lib
copying build/lib/easy_install.py -> /usr/local/lib/python2.7/site-packages
copying build/lib/pkg_resources/__init__.py -> /usr/local/lib/python2.7/site-packages/pkg_resources
error: [Errno 13] Permission denied: '/usr/local/lib/python2.7/site-  packages/pkg_resources/__init__.py'
Warning: The post-install step did not complete successfully
You can try again using `brew postinstall python`

==> Caveats
Pip and setuptools have been installed. To update them 
  pip install --upgrade pip setuptools

You can install Python packages with
  pip install <package>

They will install into the site-package directory
  /usr/local/lib/python2.7/site-packages

See: https://github.com/Homebrew/brew/blob/master/docs/Homebrew-and Python.md

.app bundles were installed.
Run `brew linkapps python` to symlink these to /Applications.
==> Summary
????  /usr/local/Cellar/python/2.7.12_2: 3,150 files, 42.5M

以前有没有人看到过这个问题，或者现在如何解决这个问题以完成 python 安装过程？

【问题讨论】：

标签： python installation homebrew

【解决方案1】：

错误消息说你没有权限在/usr/local/lib/python2.7/site-packages/pkg_resources下写。

以下步骤应该有效：

删除损坏的 Python 安装：
```
brew uninstall python
```

确保您拥有该目录：

sudo chown -R $(whoami):admin /usr/local/lib/python2.7/site-packages

重试：
```
brew install python
```

【讨论】：

我必须更新我的路径：sudo chown -R $(whoami):admin /Users/YourUser/Library/Python/2.7/lib/python/site-packages 才能找到它。

【解决方案2】：

使用 Brew 安装 Python3 在终端输入 brew 命令

brew install python3

可选，PATH 环境设置 PATH 环境变量，如果你使用 HomeBrew 安装 Python3，那么 HomeBrew 已经添加了 PATH。

如果可以从终端启动 python3，请不要更改 PATH 环境。

将以下行添加到您的 ~/.profile 文件中

export PATH=/usr/local/bin:/usr/local/sbin:$PATH

通常你的 Python 安装目录是这样的，把它添加到你的 PATH 中

PATH="/Library/Frameworks/Python.framework/Versions/3.6/bin:${PATH}"

【讨论】：