Ubuntu下Python2与Python3的共存

修改配置

sudo update-alternatives --install /usr/bin/python python /usr/bin/python2.7 2 
# 添加Python2可选项，优先级为2
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.6 1 
# 添加Python3可选项，优先级为1
sudo update-alternatives --config python
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出现如下配置菜单，发现现在是自动模式，选择python2，要设置为python3只需要选择2，enter即可啦～

补充

给python2和python3装上pip，注意不能互相用对方的pip

sudo apt-get install python2-pip
sudo apt-get install python3-pip

From: https://blog.csdn.net/weixin_40293491/article/details/81183491