1.在Mac下用Homebrew安裝Python3.5(Mac 自帶的Python是2.7)

brew install python3

2.安裝完成之后發現出錯了

Error: An unexpected error occurred during the `brew link` step

The formula built, but is not symlinked into /usr/local

Permission denied - /usr/local/Frameworks

Error: Permission denied - /usr/local/Frameworks

3.剛剛開始以為權限不夠，用sudo重新安裝也是不行，再次重新安裝(不用sudo)出現這樣的錯誤：

brew install python3

Warning: python3-3.5.0 already installed, it's just not linked

4.沒辦法，只要用brew doctor檢查看看錯誤在哪里(省略了一部分不重要的提示)

**Please note that these warnings are just used to help the Homebrew maintainers**

**with debugging if you file an issue. If everything you use Homebrew for is**

**working fine: please don't worry and just ignore them. Thanks!**

Warning: The /usr/local is not writable.

You should probably change the ownership and permissions of /usr/local

back to your user account.

sudo chown -R $(whoami) /usr/local

Warning: The /usr/local directory is not writable.

Even if this directory was writable when you installed Homebrew, other

software may change permissions on this directory. Some versions of the

"InstantOn" component of Airfoil are known to do this.

You should probably change the ownership and permissions of /usr/local

back to your user account.

sudo chown -R $(whoami):admin /usr/local

5.根據提示輸入sudo chown -R $(whoami):admin /usr/local，然后再brew link python3即可

總結

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