在mac的命令行工具上使用Homebrew安装Python3.6.5
>$ brew install python3
结果出现如下的错误：
Error: An unexpected error occurred during the `brew link` step
The formula built, but is not symlinked into /usr/local
Permission denied @ dir_s_mkdir - /usr/local/Frameworks
Error: Permission denied @ dir_s_mkdir - /usr/local/Frameworks
再次尝试安装
>$ brew install python3
Warning: python 3.6.5 is already installed, it's just not linked
You can use `brew link python` to link this version.
这时，Python3.6.5已经安装了,但是没有链接到，并提示使用‘brew link python’链接：
>$ brew link python
Linking /usr/local/Cellar/python/3.6.5... Error: Permission denied @ dir_s_mkdir - /usr/local/Frameworks
然后百度一下，发现好多解决的链接，选个逼格高点的：
https://github.com/Homebrew/homebrew-core/issues/19286
按照里面的方法：
> $ sudo sudo mkdir /usr/local/Frameworks
Password:
> $ sudo chown $(whoami):admin /usr/local/Frameworks
接下来链接python
>$ brew link python
Linking /usr/local/Cellar/python/3.6.5... 1004 symlinks created
运行python3
>$ python3
Python 3.6.5 (default, Apr 25 2018, 14:23:58)
[GCC 4.2.1 Compatible Apple LLVM 9.1.0 (clang-902.0.39.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>
OK ,解决！！！
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