基本就是删除默认的，新增最新安装的，旧版本可以继续保留
删除Current连接
sudo rm /System/Library/Frameworks/Python.framework/Versions/Current
一般Mac下Python安装后在/Library/Frameworks/Python.framework/Versions/，移动一下
sudo mv /Library/Frameworks/Python.framework/Versions/3.6 /System/Library/Frameworks/Python.framework/Versions
新增Current链接
sudo ln -s /System/Library/Frameworks/Python.framework/Versions/3.6 /System/Library/Frameworks/Python.framework/Versions/Current
删除系统默认的连接
sudo rm /usr/bin/pydoc
sudo rm /usr/bin/python
sudo rm /usr/bin/pythonw
sudo rm /usr/bin/python-config
将新版python可执行文件连接到系统默认
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
最后修改一下文件夹用户
sudo chown -R root:wheel /System/Library/Frameworks/Python.framework/Versions/3.6