基本就是刪除默認的，新增最新安裝的，舊版本可以繼續保留
刪除Current連接
sudo rm /System/Library/Frameworks/Python.framework/Versions/Current
一般Mac下Python安裝後在/Library/Frameworks/Python.framework/Versions/，移動一下
sudo mv /Library/Frameworks/Python.framework/Versions/3.6 /System/Library/Frameworks/Python.framework/Versions
新增Current鏈接
sudo ln -s /System/Library/Frameworks/Python.framework/Versions/3.6 /System/Library/Frameworks/Python.framework/Versions/Current
刪除系統默認的連接
sudo rm /usr/bin/pydoc
sudo rm /usr/bin/python
sudo rm /usr/bin/pythonw
sudo rm /usr/bin/python-config
將新版python可執行文件連接到系統默認
sudo ln -s /System/Library/Frameworks/Python.framework/Versions/3.6/bin/pydoc3.6 /usr/bin/pydoc
sudo ln -s /System/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 /usr/bin/python
sudo ln -s /System/Library/Frameworks/Python.framework/Versions/3.6/bin/pythonw3.6 /usr/bin/pythonw
sudo ln -s /System/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6m-config /usr/bin/python-config
最後修改一下文件夾用戶
sudo chown -R root:wheel /System/Library/Frameworks/Python.framework/Versions/3.6