Ubuntu 18.0 中设置python3为默认环境
sudo update-alternatives –install /usr/bin/python python /usr/bin/python2 100
sudo update-alternatives –install /usr/bin/python python /usr/bin/python3 150
sudo update-alternatives –list python
如果要切换到Python2，执行：
sudo update-alternatives –config python
按照提示输入数字按回车即可
转载自：https://blog.csdn.net/GIS_BT/article/details/85054239
