mac卸载python3.6方法如下：
（1）删除Python 3.6 framework
sudo rm -rf /Library/Frameworks/Python.framework/Versions/3.6
（2）删除用户目录下的lib库
sudo rm -rf /Users/mac/Library/Python/3.6
（3）删除Python 3.6 应用目录
sudo rm -rf "/Applications/Python 3.6"
（4）删除/usr/local/bin 目录下指向的Python3.6的连接
cd /usr/local/bin/
ls -l /usr/local/bin | grep '../Library/Frameworks/Python.framework/Versions/3.6' | awk '{print $9}' | xargs sudo rm
