最近一次Mac升級(jí), 導(dǎo)致使用brew出錯(cuò)，以后得記住升級(jí)之前最好用TimeMachine備份一下，不然折騰死人啊出錯(cuò)信息

/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- mach (LoadError) from 
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/Library/Homebrew/extend/pathname.rb:2:in `<top (required)>' from
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from 
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/Library/Homebrew/global.rb:3:in `<top (required)>' from 
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from 
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/Library/brew.rb:15:in `<main>'

其實(shí)我沒看懂出錯(cuò)信息(^o)/~，反正就是brew也不能用了，然后就簡(jiǎn)單粗暴的來了比較好的升級(jí)方法可以參考這里池建強(qiáng)的文章

大致步驟
1.刪除舊的brew

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"

2.安裝新的brew

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

3.刪除通過dmg文件安裝的python3版本

系統(tǒng)python路徑
/System/Library/Frameworks/Python.framework/Versions/
手動(dòng)安裝python路徑
/Library/Frameworks/Python.framework/Versions/

(1)刪除Python框架,參考
sudo rm -rf /Library/Frameworks/Python.framework/Versions/x.x
(2)刪除Python程序
sudo rm -rf “/Applications/Python x.x”
(3)刪除/usr/local/bin目錄下的Python連接
3.用homebrew安裝python3不同版本
brew install python3