1、当前遇到一个问题，python3.6安装后，引入ssl报错；
看到网上各种解决及解释方式。即python3.6安装的时候，没有正确引入ssl包。
2、所以决定，直接更新到python3.7
ll /usr/local/bin/python3
lrwxr-xr-x 1 root wheel 69B 3 16 23:21 /usr/local/bin/python3 -> ../../../Library/Frameworks/Python.framework/Versions/3.7/bin/python3
删掉旧的软连接
sudo rm /usr/local/bin/python3
ln -s /Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 /usr/local/bin/python3
/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7
alias python="/usr/local/bin/python3"
其他命令
which python3
which python3.6
which python3.7