详细情况见：
https://blog.csdn.net/CYM_LMY/article/details/78315139
显示Python代替版本信息
update-alternatives --list python
执行后显示
update-alternatives: error: no alternatives for python 表示Python代替版本尚未安装
执行一下命令安装
sudo update-alternatives --install /usr/bin/python python /usr/bin/python2.7 1
结果：update-alternatives: using /usr/bin/python2.7 to provide /usr/bin/python (python) in auto mode
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.5 2
结果：update-alternatives: using /usr/bin/python3.5 to provide /usr/bin/python (python) in auto mode
显示Python代替版本信息
update-alternatives --list python
切换版本update-alternatives --config python
选择序号即可切换
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