python更新版本

1、當前遇到一個問題，python3.6安裝後，引入ssl報錯；
看到網上各種解決及解釋方式。即python3.6安裝的時候，沒有正確引入ssl包。
2、所以決定，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

刪掉舊的軟連接
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