Ubuntu下系统使用python执行python3 的执行操作

1、彻底的卸载python2的流程

#1.卸载python2.7
sudo apt-get remove python2.7

#2.卸载python2.7及其依赖
sudo apt-get remove --auto-remove python2.7

#3.消除python2.7
sudo apt-get purge python2.7 or sudo apt-get purge --auto-remove python2.7

2、将Python3软连接到Python

sudo ln -s /usr/bin/python3 /usr/bin/python`